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* Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommuLinus Torvalds2011-10-301-7/+61
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (33 commits) iommu/core: Remove global iommu_ops and register_iommu iommu/msm: Use bus_set_iommu instead of register_iommu iommu/omap: Use bus_set_iommu instead of register_iommu iommu/vt-d: Use bus_set_iommu instead of register_iommu iommu/amd: Use bus_set_iommu instead of register_iommu iommu/core: Use bus->iommu_ops in the iommu-api iommu/core: Convert iommu_found to iommu_present iommu/core: Add bus_type parameter to iommu_domain_alloc Driver core: Add iommu_ops to bus_type iommu/core: Define iommu_ops and register_iommu only with CONFIG_IOMMU_API iommu/amd: Fix wrong shift direction iommu/omap: always provide iommu debug code iommu/core: let drivers know if an iommu fault handler isn't installed iommu/core: export iommu_set_fault_handler() iommu/omap: Fix build error with !IOMMU_SUPPORT iommu/omap: Migrate to the generic fault report mechanism iommu/core: Add fault reporting mechanism iommu/core: Use PAGE_SIZE instead of hard-coded value iommu/core: use the existing IS_ALIGNED macro iommu/msm: ->unmap() should return order of unmapped page ... Fixup trivial conflicts in drivers/iommu/Makefile: "move omap iommu to dedicated iommu folder" vs "Rename the DMAR and INTR_REMAP config options" just happened to touch lines next to each other.
| *-. Merge branches 'amd/fixes', 'debug/dma-api', 'arm/omap', 'arm/msm', 'core', ↵Joerg Roedel2011-10-211-7/+61
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'iommu/fault-reporting' and 'api/iommu-ops-per-bus' into next Conflicts: drivers/iommu/amd_iommu.c drivers/iommu/iommu.c
| | | * dma-debug: hash_bucket_find needs to allow for offsets within an entryNeil Horman2011-08-231-7/+61
| | |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Users of the pci_dma_sync_single_* api allow users to sync address ranges within the range of a mapped entry (i.e. you can dma map address X to dma_addr_t A and then pci_dma_sync_single on dma_addr_t A+1. The dma-debug library however assume dma syncs will always occur using the base address of a mapped region, and uses that assumption to find entries in its hash table. Since thats often (but not always the case), the dma debug library can give us false errors about missing entries, which are reported as syncing of memory not allocated by the driver. This was noted in the cxgb3 driver as this error: WARNING: at lib/dma-debug.c:902 check_sync+0xdd/0x48c() Hardware name: To be filled by O.E.M. cxgb3 0000:01:00.0: DMA-API: device driver tries to sync DMA memory it has not allocated [device address=0x00000000fff97800] [size=1984 bytes] Modules linked in: autofs4 sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 uinput snd_hda_codec_intelhdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer e1000e snd soundcore r8169 cxgb3 iTCO_wdt snd_page_alloc mii shpchp i2c_i801 iTCO_vendor_support mdio microcode firewire_ohci firewire_core crc_itu_t ata_generic pata_acpi i915 drm_kms_helper drm i2c_algo_bit i2c_core video output [last unloaded: scsi_wait_scan] Pid: 1818, comm: ifconfig Not tainted 2.6.35-0.23.rc3.git6.fc14.x86_64 #1 Call Trace: [<ffffffff81050f71>] warn_slowpath_common+0x85/0x9d [<ffffffff8105102c>] warn_slowpath_fmt+0x46/0x48 [<ffffffff8124658e>] ? check_sync+0x39/0x48c [<ffffffff8107c470>] ? trace_hardirqs_on+0xd/0xf [<ffffffff81246632>] check_sync+0xdd/0x48c [<ffffffff81246ca6>] debug_dma_sync_single_for_device+0x3f/0x41 [<ffffffffa011615c>] ? pci_map_page+0x84/0x97 [cxgb3] [<ffffffffa0117bc3>] pci_dma_sync_single_for_device.clone.0+0x65/0x6e [cxgb3] [<ffffffffa0117ed1>] refill_fl+0x305/0x30a [cxgb3] [<ffffffffa011857d>] t3_sge_alloc_qset+0x6a7/0x821 [cxgb3] [<ffffffffa010a07b>] cxgb_up+0x4d0/0xe62 [cxgb3] [<ffffffff81086037>] ? __module_text_address+0x12/0x58 [<ffffffffa010aa4c>] cxgb_open+0x3f/0x309 [cxgb3] [<ffffffff813e9f6c>] __dev_open+0x8e/0xbc [<ffffffff813e7ca5>] __dev_change_flags+0xbe/0x142 [<ffffffff813e9ea8>] dev_change_flags+0x21/0x57 [<ffffffff81445937>] devinet_ioctl+0x29a/0x54b [<ffffffff811f9a87>] ? inode_has_perm+0xaa/0xce [<ffffffff81446ed2>] inet_ioctl+0x8f/0xa7 [<ffffffff813d683a>] sock_do_ioctl+0x29/0x48 [<ffffffff813d6c83>] sock_ioctl+0x213/0x222 [<ffffffff81137f78>] vfs_ioctl+0x32/0xa6 [<ffffffff811384e2>] do_vfs_ioctl+0x47a/0x4b3 [<ffffffff81138571>] sys_ioctl+0x56/0x79 [<ffffffff81009c32>] system_call_fastpath+0x16/0x1b ---[ end trace 69a4d4cc77b58004 ]--- (some edits by Joerg Roedel) Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Reported-by: Jay Fenalson <fenlason@redhat.com> CC: Divy LeRay <divy@chelsio.com> CC: Stanislaw Gruszka <sgruszka@redhat.com> CC: Joerg Roedel <joerg.roedel@amd.com> CC: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* | | Merge branch 'for-linus' of ↵Linus Torvalds2011-10-282-1/+15
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (83 commits) mmc: fix compile error when CONFIG_BLOCK is not enabled mmc: core: Cleanup eMMC4.5 conditionals mmc: omap_hsmmc: if multiblock reads are broken, disable them mmc: core: add workaround for controllers with broken multiblock reads mmc: core: Prevent too long response times for suspend mmc: recognise SDIO cards with SDIO_CCCR_REV 3.00 mmc: sd: Handle SD3.0 cards not supporting UHS-I bus speed mode mmc: core: support HPI send command mmc: core: Add cache control for eMMC4.5 device mmc: core: Modify the timeout value for writing power class mmc: core: new discard feature support at eMMC v4.5 mmc: core: mmc sanitize feature support for v4.5 mmc: dw_mmc: modify DATA register offset mmc: sdhci-pci: add flag for devices that can support runtime PM mmc: omap_hsmmc: ensure pbias configuration is always done mmc: core: Add Power Off Notify Feature eMMC 4.5 mmc: sdhci-s3c: fix potential NULL dereference mmc: replace printk with appropriate display macro mmc: core: Add default timeout value for CMD6 mmc: sdhci-pci: add runtime pm support ...
| * | | fault-inject: export setup_fault_attr()Per Forlin2011-10-261-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | mmc_core module needs to use setup_fault_attr() in order to set fault injection attributes during module load time. Signed-off-by: Per Forlin <per.forlin@linaro.org> Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Chris Ball <cjb@laptop.org>
| * | | mmc: core: add random fault injectionPer Forlin2011-10-261-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds support to inject data errors after a completed host transfer. The mmc core will return error even though the host transfer is successful. This simple fault injection proved to be very useful to test the non-blocking error handling in the mmc_blk_issue_rw_rq(). Random faults can also test how the host driver handles pre_req() and post_req() in case of errors. Signed-off-by: Per Forlin <per.forlin@linaro.org> Acked-by: Akinobu Mita <akinobu.mita@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
| * | | fault-inject: export fault injection functionsPer Forlin2011-10-261-0/+2
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | Export symbols should_fail() and fault_create_debugfs_attr() in order to let modules utilize the fault injection framework. Signed-off-by: Per Forlin <per.forlin@linaro.org> Acked-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Chris Ball <cjb@laptop.org>
* | | Merge branch 'for-linus' of git://neil.brown.name/mdLinus Torvalds2011-10-261-1/+1
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://neil.brown.name/md: (34 commits) md: Fix some bugs in recovery_disabled handling. md/raid5: fix bug that could result in reads from a failed device. lib/raid6: Fix filename emitted in generated code md.c: trivial comment fix MD: Allow restarting an interrupted incremental recovery. md: clear In_sync bit on devices added to an active array. md: add proper write-congestion reporting to RAID1 and RAID10. md: rename "mdk_personality" to "md_personality" md/bitmap remove fault injection options. md/raid5: typedef removal: raid5_conf_t -> struct r5conf md/raid1: typedef removal: conf_t -> struct r1conf md/raid10: typedef removal: conf_t -> struct r10conf md/raid0: typedef removal: raid0_conf_t -> struct r0conf md/multipath: typedef removal: multipath_conf_t -> struct mpconf md/linear: typedef removal: linear_conf_t -> struct linear_conf md/faulty: remove typedef: conf_t -> struct faulty_conf md/linear: remove typedefs: dev_info_t -> struct dev_info md: remove typedefs: mirror_info_t -> struct mirror_info md: remove typedefs: r10bio_t -> struct r10bio and r1bio_t -> struct r1bio md: remove typedefs: mdk_thread_t -> struct md_thread ...
| * | | lib/raid6: Fix filename emitted in generated codeDan McGee2011-10-201-1/+1
| | |/ | |/| | | | | | | | | | | | | | | | | | | The files were renamed in commit cc4589ebf; fix the name in the file itself. Signed-off-by: Dan McGee <dpmcgee@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
* | | Merge branch 'sched-core-for-linus' of ↵Linus Torvalds2011-10-264-64/+19
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits) llist: Add back llist_add_batch() and llist_del_first() prototypes sched: Don't use tasklist_lock for debug prints sched: Warn on rt throttling sched: Unify the ->cpus_allowed mask copy sched: Wrap scheduler p->cpus_allowed access sched: Request for idle balance during nohz idle load balance sched: Use resched IPI to kick off the nohz idle balance sched: Fix idle_cpu() llist: Remove cpu_relax() usage in cmpxchg loops sched: Convert to struct llist llist: Add llist_next() irq_work: Use llist in the struct irq_work logic llist: Return whether list is empty before adding in llist_add() llist: Move cpu_relax() to after the cmpxchg() llist: Remove the platform-dependent NMI checks llist: Make some llist functions inline sched, tracing: Show PREEMPT_ACTIVE state in trace_sched_switch sched: Remove redundant test in check_preempt_tick() sched: Add documentation for bandwidth control sched: Return unused runtime on group dequeue ...
| * | | sched: Wrap scheduler p->cpus_allowed accessPeter Zijlstra2011-10-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This task is preparatory for the migrate_disable() implementation, but stands on its own and provides a cleanup. It currently only converts those sites required for task-placement. Kosaki-san once mentioned replacing cpus_allowed with a proper cpumask_t instead of the NR_CPUS sized array it currently is, that would also require something like this. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Link: http://lkml.kernel.org/n/tip-e42skvaddos99psip0vce41o@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | llist: Remove cpu_relax() usage in cmpxchg loopsPeter Zijlstra2011-10-041-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Initial benchmarks show they're a net loss: $ for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo performance > $i; done $ echo 4096 32000 64 128 > /proc/sys/kernel/sem $ ./sembench -t 2048 -w 1900 -o 0 Pre: run time 30 seconds 778936 worker burns per second run time 30 seconds 912190 worker burns per second run time 30 seconds 817506 worker burns per second run time 30 seconds 830870 worker burns per second run time 30 seconds 845056 worker burns per second Post: run time 30 seconds 905920 worker burns per second run time 30 seconds 849046 worker burns per second run time 30 seconds 886286 worker burns per second run time 30 seconds 822320 worker burns per second run time 30 seconds 900283 worker burns per second So about 4% faster. (!) cpu_relax() stalls the pipeline, therefore, when used in a tight loop it has the following benefits: - allows SMT siblings to have a go; - reduces pressure on the CPU interconnect. However, cmpxchg loops are unfair and thus have unbounded completion time, therefore we should avoid getting in such heavily contended situations where the above benefits make any difference. A typical cmpxchg loop should not go round more than a handfull of times at worst, therefore adding extra delays just slows things down. Since the llist primitives are new, there aren't any bad users yet, and we should avoid growing them. Heavily contended sites should generally be better off using the ticket locks for serialization since they provide bounded completion times (fifo-fair over the cpus). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Huang Ying <ying.huang@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/1315836358.26517.43.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | llist: Return whether list is empty before adding in llist_add()Huang Ying2011-10-041-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the llist_add*() functions to return a success indicator, this allows us in the scheduler code to send an IPI if the queue was empty. ( There's no effect on existing users, because the list_add_xxx() functions are inline, thus this will be optimized out by the compiler if not used by callers. ) Signed-off-by: Huang Ying <ying.huang@intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1315461646-1379-5-git-send-email-ying.huang@intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | llist: Move cpu_relax() to after the cmpxchg()Huang Ying2011-10-041-4/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If in llist_add()/etc. functions the first cmpxchg() call succeeds, it is not necessary to use cpu_relax() before the cmpxchg(). So cpu_relax() in a busy loop involving cmpxchg() should go after cmpxchg() instead of before that. This patch fixes this for all involved llist functions. Signed-off-by: Huang Ying <ying.huang@intel.com> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1315461646-1379-4-git-send-email-ying.huang@intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | llist: Remove the platform-dependent NMI checksIngo Molnar2011-10-041-10/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove the nmi() checks spread around the code. in_nmi() is not available on every architecture and it's a pretty obscure and ugly check in any case. Cc: Huang Ying <ying.huang@intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1315461646-1379-3-git-send-email-ying.huang@intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | llist: Make some llist functions inlineHuang Ying2011-10-043-46/+1
| | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Because llist code will be used in performance critical scheduler code path, make llist_add() and llist_del_all() inline to avoid function calling overhead and related 'glue' overhead. Signed-off-by: Huang Ying <ying.huang@intel.com> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1315461646-1379-2-git-send-email-ying.huang@intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | Merge branch 'core-locking-for-linus' of ↵Linus Torvalds2011-10-266-76/+76
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits) rtmutex: Add missing rcu_read_unlock() in debug_rt_mutex_print_deadlock() lockdep: Comment all warnings lib: atomic64: Change the type of local lock to raw_spinlock_t locking, lib/atomic64: Annotate atomic64_lock::lock as raw locking, x86, iommu: Annotate qi->q_lock as raw locking, x86, iommu: Annotate irq_2_ir_lock as raw locking, x86, iommu: Annotate iommu->register_lock as raw locking, dma, ipu: Annotate bank_lock as raw locking, ARM: Annotate low level hw locks as raw locking, drivers/dca: Annotate dca_lock as raw locking, powerpc: Annotate uic->lock as raw locking, x86: mce: Annotate cmci_discover_lock as raw locking, ACPI: Annotate c3_lock as raw locking, oprofile: Annotate oprofilefs lock as raw locking, video: Annotate vga console lock as raw locking, latencytop: Annotate latency_lock as raw locking, timer_stats: Annotate table_lock as raw locking, rwsem: Annotate inner lock as raw locking, semaphores: Annotate inner lock as raw locking, sched: Annotate thread_group_cputimer as raw ... Fix up conflicts in kernel/posix-cpu-timers.c manually: making cputimer->cputime a raw lock conflicted with the ABBA fix in commit bcd5cff7216f ("cputimer: Cure lock inversion").
| * | | lib: atomic64: Change the type of local lock to raw_spinlock_tYong Zhang2011-09-141-11/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are still some leftovers of commit f59ca058 [locking, lib/atomic64: Annotate atomic64_lock::lock as raw] [ tglx: Seems I picked the wrong version of that patch :( ] Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shan Hai <haishan.bai@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Link: http://lkml.kernel.org/r/20110914074924.GA16096@zhy Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | | locking, lib/atomic64: Annotate atomic64_lock::lock as rawShan Hai2011-09-131-22/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The spinlock protected atomic64 operations must be irq safe as they are used in hard interrupt context and cannot be preempted on -rt: NIP [c068b218] rt_spin_lock_slowlock+0x78/0x3a8 LR [c068b1e0] rt_spin_lock_slowlock+0x40/0x3a8 Call Trace: [eb459b90] [c068b1e0] rt_spin_lock_slowlock+0x40/0x3a8 (unreliable) [eb459c20] [c068bdb0] rt_spin_lock+0x40/0x98 [eb459c40] [c03d2a14] atomic64_read+0x48/0x84 [eb459c60] [c001aaf4] perf_event_interrupt+0xec/0x28c [eb459d10] [c0010138] performance_monitor_exception+0x7c/0x150 [eb459d30] [c0014170] ret_from_except_full+0x0/0x4c So annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Shan Hai <haishan.bai@gmail.com> Reviewed-by: Yong Zhang <yong.zhang0@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | locking, rwsem: Annotate inner lock as rawThomas Gleixner2011-09-132-26/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no reason to allow the lock protecting rwsems (the ownerless variant) to be preemptible on -rt. Convert it to raw. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | locking, printk: Annotate logbuf_lock as rawThomas Gleixner2011-09-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The logbuf_lock lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [ merged and fixed it ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | locking, lib/proportions: Annotate prop_local_percpu::lock as rawThomas Gleixner2011-09-131-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The prop_local_percpu::lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | locking, percpu_counter: Annotate ::lock as rawThomas Gleixner2011-09-131-9/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The percpu_counter::lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | | Merge branch 'driver-core-next' of ↵Linus Torvalds2011-10-252-55/+120
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core * 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (38 commits) mm: memory hotplug: Check if pages are correctly reserved on a per-section basis Revert "memory hotplug: Correct page reservation checking" Update email address for stable patch submission dynamic_debug: fix undefined reference to `__netdev_printk' dynamic_debug: use a single printk() to emit messages dynamic_debug: remove num_enabled accounting dynamic_debug: consolidate repetitive struct _ddebug descriptor definitions uio: Support physical addresses >32 bits on 32-bit systems sysfs: add unsigned long cast to prevent compile warning drivers: base: print rejected matches with DEBUG_DRIVER memory hotplug: Correct page reservation checking memory hotplug: Refuse to add unaligned memory regions remove the messy code file Documentation/zh_CN/SubmitChecklist ARM: mxc: convert device creation to use platform_device_register_full new helper to create platform devices with dma mask docs/driver-model: Update device class docs docs/driver-model: Document device.groups kobj_uevent: Ignore if some listeners cannot handle message dynamic_debug: make netif_dbg() call __netdev_printk() dynamic_debug: make netdev_dbg() call __netdev_printk() ...
| * | | | dynamic_debug: fix undefined reference to `__netdev_printk'Jason Baron2011-10-181-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dynamic debug recently added support for netdev_printk. It uses __netdev_printk() to support this functionality. However, when CONFIG_NET is not set, we get the following error: lib/built-in.o: In function `__dynamic_netdev_dbg': (.text+0x9fda): undefined reference to `__netdev_printk' Fix this by making the call to netdev_printk() contingent upon CONFIG_NET. We could have fixed this by defining netdev_printk() to a 'no-op' in the !CONFIG_NET case. However, this is not consistent with how the networking layer uses netdev_printk. For example, CONFIG_NET is not set, netdev_printk() does not have a 'no-op' definition defined. Signed-off-by: Jason Baron <jbaron@redhat.com> Acked-by: Randy Dunlap <rdunlap@xenotime.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: use a single printk() to emit messagesJason Baron2011-10-181-39/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We were using KERN_CONT to combine messages with their prefix. However, KERN_CONT is not smp safe, in the sense that it can interleave messages. This interleaving can result in printks coming out at the wrong loglevel. With the high frequency of printks that dynamic debug can produce this is not desirable. So make dynamic_emit_prefix() fill a char buf[64] instead of doing a printk directly. If we enable printing out of function, module, line, or pid info, they are placed in this 64 byte buffer. In my testing 64 bytes was enough size to fulfill all requests. Even if it's not, we can match up the printk itself to see where it's from, so to me this is no big deal. [akpm@linux-foundation.org: convert dangerous macro to C] Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: remove num_enabled accountingJason Baron2011-10-181-7/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The num_enabled accounting isn't actually used anywhere - remove them. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | kobj_uevent: Ignore if some listeners cannot handle messageMilan Broz2011-08-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kobject_uevent() uses a multicast socket and should ignore if one of listeners cannot handle messages or nobody is listening at all. Easily reproducible when a process in system is cloned with CLONE_NEWNET flag. (See also http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/5256) Signed-off-by: Milan Broz <mbroz@redhat.com> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: make netdev_dbg() call __netdev_printk()Jason Baron2011-08-221-0/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, if dynamic debug was enabled netdev_dbg() was using dynamic_dev_dbg() to print out the underlying msg. Fix this by making sure netdev_dbg() uses __netdev_printk(). Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: Convert printks to pr_<level>Joe Perches2011-08-221-33/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add pr_fmt(fmt) with __func__. Converts "ddebug:" prefix to "dynamic_debug:". Most likely the if (verbose) outputs could also be converted from pr_info to pr_debug. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: Remove uses of KERN_CONT in dynamic_emit_prefixJoe Perches2011-08-221-11/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Multiple printks with KERN_CONT can be interleaved by other printks. Reduce the likelihood of that interleaving by consolidating multiple calls to printk. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: Consolidate prefix output to single routineJoe Perches2011-08-221-20/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding dynamic_dev_dbg duplicated prefix output. Consolidate that output to a single routine. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| * | | | dynamic_debug: Add __dynamic_dev_dbgJoe Perches2011-08-221-0/+38
| | |_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Unlike dynamic_pr_debug, dynamic uses of dev_dbg can not currently add task_pid/KBUILD_MODNAME/__func__/__LINE__ to selected debug output. Add a new function similar to dynamic_pr_debug to optionally emit these prefixes. Cc: Aloisio Almeida <aloisio.almeida@openbossa.org> Noticed-by: Aloisio Almeida <aloisio.almeida@openbossa.org> Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | | | Merge branch 'for-linus' of ↵Linus Torvalds2011-10-253-22/+21
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (59 commits) MAINTAINERS: linux-m32r is moderated for non-subscribers linux@lists.openrisc.net is moderated for non-subscribers Drop default from "DM365 codec select" choice parisc: Kconfig: cleanup Kernel page size default Kconfig: remove redundant CONFIG_ prefix on two symbols cris: remove arch/cris/arch-v32/lib/nand_init.S microblaze: add missing CONFIG_ prefixes h8300: drop puzzling Kconfig dependencies MAINTAINERS: microblaze-uclinux@itee.uq.edu.au is moderated for non-subscribers tty: drop superfluous dependency in Kconfig ARM: mxc: fix Kconfig typo 'i.MX51' Fix file references in Kconfig files aic7xxx: fix Kconfig references to READMEs Fix file references in drivers/ide/ thinkpad_acpi: Fix printk typo 'bluestooth' bcmring: drop commented out line in Kconfig btmrvl_sdio: fix typo 'btmrvl_sdio_sd6888' doc: raw1394: Trivial typo fix CIFS: Don't free volume_info->UNC until we are entirely done with it. treewide: Correct spelling of successfully in comments ...
| * \ \ \ Merge branch 'master' into for-nextJiri Kosina2011-09-1515-244/+862
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | Fast-forward merge with Linus to be able to merge patches based on more recent version of the tree.
| * | | | | Remove unneeded version.h include from lib/Jesper Juhl2011-09-151-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes an unneeded include of linux/version.h from lib/dynamic_debug.c - identified by 'make versioncheck'. This is the only file in lib/ with this issue. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | | | | Kconfig: Copyedit: DEBUG_SECTION_MISMATCHMichael Witten2011-09-151-19/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Michael Witten <mfwitten@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | | | | lib: Kconfig.debug: Typo remove extra "it"Justin P. Mattock2011-08-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch below removes an extra "it" in the comment. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | | | | Fix kernel-doc comment typo '@id'Paul Bolle2011-08-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | | | | Merge branch 'for-linus' of ↵Linus Torvalds2011-10-251-2/+2
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm * 'for-linus' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm: (81 commits) ARM: 7133/1: SMP: fix per cpu timer setup before the cpu is marked online ARM: 7129/1: Add __arm_ioremap_exec for mapping external memory as MT_MEMORY ARM: 7136/1: pl330: Fix a race condition ARM: smp: fix clipping of number of CPUs ARM: 7137/1: Fix error upon adding LL debug ARM: Add a few machine types to mach-types ARM: 7130/1: dev_archdata: add private iommu extension ARM: 7125/1: Add unwinding annotations for 64bit division functions ARM: 7120/1: remove bashism in check for multiple zreladdrs ARM: 7118/1: rename temp variable in read*_relaxed() ARM: 6217/4: mach-realview: expose PB1176 ROM using physmap and map_rom ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage ARM: 7062/1: cache: detect PIPT I-cache using CTR ARM: platform fixups: remove mdesc argument to fixup function ARM: 7017/1: Use generic BUG() handler ARM: 7102/1: mach-integrator: update defconfig ARM: 7087/2: mach-integrator: get timer frequency from clock ARM: 7086/2: mach-integrator: modernize clock event registration ARM: 7085/2: mach-integrator: clockevent supports oneshot mode ARM: 7084/1: mach-integrator: retire some timer macros ...
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| *-----. \ \ \ \ \ Merge branches 'arnd-randcfg-fixes', 'debug', 'io' (early part), 'l2x0', ↵Russell King2011-10-251-2/+2
| |\ \ \ \ \ \ \ \ \ | | | | | |_|_|/ / / | | | | |/| | | / / | | | | |_|_|_|/ / | | | |/| | | | / | | |_|_|_|_|_|/ | |/| | | | | | 'p2v', 'pgt' (early part) and 'smp' into for-linus
| | * | | | | | ARM: always use ARM_UNWIND for thumb2 kernelsArnd Bergmann2011-10-011-2/+2
| | | |/ / / / | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Thumb2 kernels cannot be built with frame pointers, but can use the ARM_UNWIND feature for unwinding instead. This makes sure that all features that rely on unwinding includeing CONFIG_LATENCYTOP and FAULT_INJECTION_STACKTRACE_FILTER do not enable frame pointers when the unwinder is already selected, and we always build with the unwinder when we want a thumb2 kernel, to make sure we do not get the frame pointers instead. A different option would be to redefine the CONFIG_FRAME_POINTERS option on ARM to mean builing with either frame pointers or the unwinder, and then select which one to use based on the CPU architecture or another user option. That would still allow building thumb2 kernels without the unwinder but would also be more confusing. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* | | | | | | Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-securityLinus Torvalds2011-10-251-4/+11
|\ \ \ \ \ \ \ | |/ / / / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'next' of git://selinuxproject.org/~jmorris/linux-security: (95 commits) TOMOYO: Fix incomplete read after seek. Smack: allow to access /smack/access as normal user TOMOYO: Fix unused kernel config option. Smack: fix: invalid length set for the result of /smack/access Smack: compilation fix Smack: fix for /smack/access output, use string instead of byte Smack: domain transition protections (v3) Smack: Provide information for UDS getsockopt(SO_PEERCRED) Smack: Clean up comments Smack: Repair processing of fcntl Smack: Rule list lookup performance Smack: check permissions from user space (v2) TOMOYO: Fix quota and garbage collector. TOMOYO: Remove redundant tasklist_lock. TOMOYO: Fix domain transition failure warning. TOMOYO: Remove tomoyo_policy_memory_lock spinlock. TOMOYO: Simplify garbage collector. TOMOYO: Fix make namespacecheck warnings. target: check hex2bin result encrypted-keys: check hex2bin result ...
| * | | | | | lib: add error checking to hex2binMimi Zohar2011-09-201-4/+11
| |/ / / / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | hex2bin converts a hexadecimal string to its binary representation. The original version of hex2bin did not do any error checking. This patch adds error checking and returns the result. Changelog v1: - removed unpack_hex_byte() - changed return code from boolean to int Changelog: - use the new unpack_hex_byte() - add __must_check compiler option (Andy Shevchenko's suggestion) - change function API to return error checking result (based on Tetsuo Handa's initial patch) Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
* | | | | / XZ: Fix incorrect XZ_BUF_ERRORLasse Collin2011-09-211-7/+20
| |_|_|_|/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | xz_dec_run() could incorrectly return XZ_BUF_ERROR if all of the following was true: - The caller knows how many bytes of output to expect and only provides that much output space. - When the last output bytes are decoded, the caller-provided input buffer ends right before the LZMA2 end of payload marker. So LZMA2 won't provide more output anymore, but it won't know it yet and thus won't return XZ_STREAM_END yet. - A BCJ filter is in use and it hasn't left any unfiltered bytes in the temp buffer. This can happen with any BCJ filter, but in practice it's more likely with filters other than the x86 BCJ. This fixes <https://bugzilla.redhat.com/show_bug.cgi?id=735408> where Squashfs thinks that a valid file system is corrupt. This also fixes a similar bug in single-call mode where the uncompressed size of a block using BCJ + LZMA2 was 0 bytes and caller provided no output space. Many empty .xz files don't contain any blocks and thus don't trigger this bug. This also tweaks a closely related detail: xz_dec_bcj_run() could call xz_dec_lzma2_run() to decode into temp buffer when it was known to be useless. This was harmless although it wasted a minuscule number of CPU cycles. Signed-off-by: Lasse Collin <lasse.collin@tukaani.org> Cc: stable <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | | lib/sha1.c: quiet sparse noise about symbol not declaredH Hartley Sweeten2011-09-131-0/+1
| |/ / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Include <linux/cryptohash.h> to pickup the declarations for sha_transform and sha_init to quite the sparse noise: warning: symbol 'sha_transform' was not declared. Should it be static? warning: symbol 'sha_init' was not declared. Should it be static? Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Mandeep Singh Baines <msb@chromium.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | bitops: Move find_next_bit.o from lib-y to obj-yGeert Uytterhoeven2011-08-301-2/+2
|/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If there are no builtin users of find_next_bit_le() and find_next_zero_bit_le(), these functions are not present in the kernel image, causing m68k allmodconfig to fail with: ERROR: "find_next_zero_bit_le" [fs/ufs/ufs.ko] undefined! ERROR: "find_next_bit_le" [fs/udf/udf.ko] undefined! ... This started to happen after commit 171d809df189 ("m68k: merge mmu and non-mmu bitops.h"), as m68k had its own inline versions before. commit 63e424c84429 ("arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT, BIT_LE, LAST_BIT}") added find_last_bit.o to obj-y (so it's always included), but find_next_bit.o to lib-y (so it gets removed by the linker if there are no builtin users). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds2011-08-062-1/+96
|\ \ \ | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: net: Compute protocol sequence numbers and fragment IDs using MD5. crypto: Move md5_transform to lib/md5.c
| * | | crypto: Move md5_transform to lib/md5.cDavid S. Miller2011-08-062-1/+96
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We are going to use this for TCP/IP sequence number and fragment ID generation. Signed-off-by: David S. Miller <davem@davemloft.net>
* | | | lib/sha1: use the git implementation of SHA-1Mandeep Singh Baines2011-08-061-54/+158
|/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For ChromiumOS, we use SHA-1 to verify the integrity of the root filesystem. The speed of the kernel sha-1 implementation has a major impact on our boot performance. To improve boot performance, we investigated using the heavily optimized sha-1 implementation used in git. With the git sha-1 implementation, we see a 11.7% improvement in boot time. 10 reboots, remove slowest/fastest. Before: Mean: 6.58 seconds Stdev: 0.14 After (with git sha-1, this patch): Mean: 5.89 seconds Stdev: 0.07 The other cool thing about the git SHA-1 implementation is that it only needs 64 bytes of stack for the workspace while the original kernel implementation needed 320 bytes. Signed-off-by: Mandeep Singh Baines <msb@chromium.org> Cc: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Cc: Nicolas Pitre <nico@cam.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: David S. Miller <davem@davemloft.net> Cc: linux-crypto@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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