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* Merge tag 'arc-v3.10-rc1-part2' of ↵Linus Torvalds2013-05-1013-74/+377
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull second set of arc arch updates from Vineet Gupta: "Aliasing VIPT dcache support for ARC I'm satisified with testing, specially with fuse which has historically given grief to VIPT arches (ARM/PARISC...)" * tag 'arc-v3.10-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: [TB10x] Remove GENERIC_GPIO ARC: [mm] Aliasing VIPT dcache support 4/4 ARC: [mm] Aliasing VIPT dcache support 3/4 ARC: [mm] Aliasing VIPT dcache support 2/4 ARC: [mm] Aliasing VIPT dcache support 1/4 ARC: [mm] refactor the core (i|d)cache line ops loops ARC: [mm] serious bug in vaddr based icache flush
| * ARC: [TB10x] Remove GENERIC_GPIOVineet Gupta2013-05-101-7/+0
| | | | | | | | | | | | | | This tracks Alexandre Courbot's mainline GPIO rework Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Alexandre Courbot <acourbot@nvidia.com>
| * ARC: [mm] Aliasing VIPT dcache support 4/4Vineet Gupta2013-05-097-5/+101
| | | | | | | | | | | | Enforce congruency of userspace shared mappings Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] Aliasing VIPT dcache support 3/4Vineet Gupta2013-05-092-2/+4
| | | | | | | | | | | | Fix the one zillion warnings Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] Aliasing VIPT dcache support 2/4Vineet Gupta2013-05-096-22/+223
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is the meat of the series which prevents any dcache alias creation by always keeping the U and K mapping of a page congruent. If a mapping already exists, and other tries to access the page, prev one is flushed to physical page (wback+inv) Essentially flush_dcache_page()/copy_user_highpage() create K-mapping of a page, but try to defer flushing, unless U-mapping exist. When page is actually mapped to userspace, update_mmu_cache() flushes the K-mapping (in certain cases this can be optimised out) Additonally flush_cache_mm(), flush_cache_range(), flush_cache_page() handle the puring of stale userspace mappings on exit/munmap... flush_anon_page() handles the existing U-mapping for anon page before kernel reads it via the GUP path. Note that while not complete, this is enough to boot a simple dynamically linked Busybox based rootfs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] Aliasing VIPT dcache support 1/4Vineet Gupta2013-05-093-18/+34
| | | | | | | | | | | | | | This preps the low level dcache flush helpers to take vaddr argument in addition to the existing paddr to properly flush the VIPT dcache Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] refactor the core (i|d)cache line ops loopsVineet Gupta2013-05-091-29/+24
| | | | | | | | | | | | | | | | Nothing semantical * simplify the alignement code by using & operation only * rename variables clearly as paddr Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] serious bug in vaddr based icache flushVineet Gupta2013-05-091-1/+1
| | | | | | | | | | | | | | | | | | | | vaddr used to index the cache was clipped from the wrong end, and thus would potentially fail to flush the correct lines. The problem was dorment for so long because up until the recent optimizations it was only used for ptrace break-point only flushes. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* | Merge tag 'arc-v3.10-rc1-part1' of ↵Linus Torvalds2013-05-0938-342/+1840
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC port updates from Vineet Gupta: "Support for two new platforms based on ARC700: - Abilis TB10x SoC [Chritisian/Pierrick] - Simulator only System-C Model [Mischa] ARC specific MM improvements: - Avoid full TLB flush (ASID increment) on munmap (even single page) - VIPT Cache Flushing improvements + Delayed dcache flush for non-aliasing dcache (big performance boost) + icache flush aliasing agnostic (no need to kill all possible aliases) Others: - Avoid needless rebuild of DTB files for every kernel build - Remove builtin cmdline as that is already provided by DeviceTree/bootargs - Fixing unaligned access emulation corner case - checkpatch fixes [Sachin] - Various fixlets [Noam] - Minor build failures/cleanups" * tag 'arc-v3.10-rc1-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (35 commits) ARC: [mm] Lazy D-cache flush (non aliasing VIPT) ARC: [mm] micro-optimize page size icache invalidate ARC: [mm] remove the pessimistic all-alias-invalidate icache helpers ARC: [mm] consolidate icache/dcache sync code ARC: [mm] optimise icache flush for kernel mappings ARC: [mm] optimise icache flush for user mappings ARC: [mm] optimize needless full mm TLB flush on munmap ARC: Add support for nSIM OSCI System C model ARC: [TB10x] Adapt device tree to new compatible string ARC: [TB10x] Add support for TB10x platform ARC: [TB10x] Device tree of TB100 and TB101 Development Kits ARC: Prepare interrupt code for external controllers ARC: Allow embedded arc-intc to be properly placed in DT intc hierarchy ARC: [cmdline] Don't overwrite u-boot provided bootargs ARC: [cmdline] Remove CONFIG_CMDLINE ARC: [plat-arcfpga] defconfig update ARC: unaligned access emulation broken if callee-reg dest of LD/ST ARC: unaligned access emulation error handling consolidation ARC: Debug/crash-printing Improvements ARC: fix typo with clock speed ...
| * ARC: [mm] Lazy D-cache flush (non aliasing VIPT)Vineet Gupta2013-05-073-7/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | flush_dcache_page( ) is MM hook to ensure that a page has consistent views between kernel and userspace. Thus it is called when * kernel writes to a page which at some later point could get mapped to userspace (so kernel mapping needs to be flushed-n-inv) * kernel is about to read from a page with possible userspace mappings (so userspace mappings needs to be made coherent with kernel ones) However for Non aliasing VIPT dcache, any userspace mapping will always be congruent to kernel mapping. Thus d-cache need need not be flushed at all (or delayed indefinitely). The only reason it does need to be flushed is when mapping code pages. Since icache doesn't snoop dcache, those dirty dcache lines need to be written back to memory and icache line invalidated so that icache lines fetch will get the right data. Decent gains on LMBench fork/exec/sh and File I/O micro-benchmarks. (1) FPGA @ 80 MHZ Processor, Processes - times in microseconds - smaller is better ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 3.9-rc6-a Linux 3.9.0-r 80 4.79 8.72 66.7 116. 239. 8.39 30.4 4798 14.K 34.K 3.9-rc6-b Linux 3.9.0-r 80 4.79 8.62 65.4 111. 239. 8.35 29.0 3995 12.K 30.K 3.9-rc7-c Linux 3.9.0-r 80 4.79 9.00 66.1 106. 239. 8.61 30.4 2858 10.K 24.K ^^^^ ^^^^ ^^^ File & VM system latencies in microseconds - smaller is better ------------------------------------------------------------------------------- Host OS 0K File 10K File Mmap Prot Page 100fd Create Delete Create Delete Latency Fault Fault selct --------- ------------- ------ ------ ------ ------ ------- ----- ------- ----- 3.9-rc6-a Linux 3.9.0-r 317.8 204.2 1122.3 375.1 3522.0 4.288 20.7 126.8 3.9-rc6-b Linux 3.9.0-r 298.7 223.0 1141.6 367.8 3531.0 4.866 20.9 126.4 3.9-rc7-c Linux 3.9.0-r 278.4 179.2 862.1 339.3 3705.0 3.223 20.3 126.6 ^^^^^ ^^^^^ ^^^^^ ^^^^ (2) Customer Silicon @ 500 MHz (166 MHz mem) ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- abilis-ba Linux 3.9.0-r 497 0.71 1.38 4.58 12.0 35.5 1.40 3.89 2070 5525 13.K abilis-ca Linux 3.9.0-r 497 0.71 1.40 4.61 11.8 35.6 1.37 3.92 1411 4317 10.K ^^^^ ^^^^ ^^^ Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] micro-optimize page size icache invalidateVineet Gupta2013-05-071-3/+12
| | | | | | | | | | | | | | | | | | | | | | | | start address is already page aligned and size is const PAGE_SIZE, thus fixups for alignment not needed in generated code. bloat-o-meter vmlinux-mm5 vmlinux add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-32 (-32) function old new delta __inv_icache_page 82 50 -32 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] remove the pessimistic all-alias-invalidate icache helpersVineet Gupta2013-05-071-184/+17
| | | | | | | | | | | | No users of this code anymore - so RIP ! Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] consolidate icache/dcache sync codeVineet Gupta2013-05-072-19/+18
| | | | | | | | | | | | | | | | | | | | Now that we have same helper used for all icache invalidates (i.e. vaddr+paddr based exact line invalidate), consolidate the open coded calls into one place. Also rename flush_icache_range_vaddr => __sync_icache_dcache Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] optimise icache flush for kernel mappingsVineet Gupta2013-05-071-4/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change continues the theme from prev commit - this time icache handling for kernel's own code modification (vmalloc: loadable modules, breakpoints for kprobes/kgdb...) flush_icache_range() calls the CDU icache helper with vaddr to enable exact line invalidate. For a true kernel-virtual mapping, the vaddr is actually virtual hence valid as index into cache. For kprobes breakpoint however, the vaddr arg is actually paddr - since that's how normal kernel is mapped in ARC memory map. This implies that CDU will use the same addr for indexing as for tag match - which is fine since kernel code would only have that "implicit" mapping and none other. This should speed up module loading significantly - specially on default ARC700 icache configurations (32k) which alias. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] optimise icache flush for user mappingsVineet Gupta2013-05-073-15/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ARC icache doesn't snoop dcache thus executable pages need to be made coherent before mapping into userspace in flush_icache_page(). However ARC700 CDU (hardware cache flush module) requires both vaddr (index in cache) as well as paddr (tag match) to correctly identify a line in the VIPT cache. A typical ARC700 SoC has aliasing icache, thus the paddr only based flush_icache_page() API couldn't be implemented efficiently. It had to loop thru all possible alias indexes and perform the invalidate operation (ofcourse the cache op would only succeed at the index(es) where tag matches - typically only 1, but the cost of visiting all the cache-bins needs to paid nevertheless). Turns out however that the vaddr (along with paddr) is available in update_mmu_cache() hence better suits ARC icache flush semantics. With both vaddr+paddr, exactly one flush operation per line is done. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [mm] optimize needless full mm TLB flush on munmapVineet Gupta2013-05-071-4/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | munmap ends up calling tlb_flush() which for ARC was flushing the entire TLB unconditionally (by moving the MMU to a new ASID) do_munmap unmap_region unmap_vmas unmap_single_vma unmap_page_range tlb_start_vma zap_pud_range tlb_end_vma() tlb_finish_mmu tlb_flush() ---> unconditional flush_tlb_mm() So even a single page munmap, a frequent operation when uClibc dynamic linker (ldso) is loading the dependent shared libraries, would move the the ASID multiple times - needlessly invalidating the pre-faulted TLB entries (and increasing the rate of ASID wraparound + full TLB flush). This is now optimised to only be called if tlb->full_mm (which means for exit/execve) cases only. And for those cases, flush_tlb_mm() is already optimised to be a no-op for mm->mm_users == 0. So essentially there are no mmore full mm flushes - except for fork which anyhow needs it for properly COW'ing parent address space. munmap now needs to do TLB range flush, which is implemented with tlb_end_vma() Results ------- 1. ASID now consistenly moves by 4 during a simple ls (as opposed to 5 or 7 before). 2. LMBench microbenchmark also shows improvements Basic system parameters ------------------------------------------------------------------------------ Host OS Description Mhz tlb cache mem scal pages line par load bytes --------- ------------- ----------------------- ---- ----- ----- ------ ---- 3.9-rc5-0 Linux 3.9.0-r 3.9-rc5-0404-gcc-4.4-ba 80 8 64 1.1000 1 3.9-rc5-0 Linux 3.9.0-r 3.9-rc5-0405-avoid-full 80 8 64 1.1200 1 Processor, Processes - times in microseconds - smaller is better ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 3.9-rc5-0 Linux 3.9.0-r 80 4.81 8.69 68.6 118. 239. 8.53 31.6 4839 13.K 34.K 3.9-rc5-0 Linux 3.9.0-r 80 4.46 8.36 53.8 91.3 223. 8.12 24.2 4725 13.K 33.K File & VM system latencies in microseconds - smaller is better ------------------------------------------------------------------------------- Host OS 0K File 10K File Mmap Prot Page 100fd Create Delete Create Delete Latency Fault Fault selct --------- ------------- ------ ------ ------ ------ ------- ----- ------- ----- 3.9-rc5-0 Linux 3.9.0-r 314.7 223.2 1054.9 390.2 3615.0 1.590 20.1 126.6 3.9-rc5-0 Linux 3.9.0-r 265.8 183.8 1014.2 314.1 3193.0 6.910 18.8 110.4 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Add support for nSIM OSCI System C modelMischa Jonker2013-05-073-0/+164
| | | | | | | | | | | | | | | | | | | | | | | | This adds support for an ARC Virtual Platform. This platform is based on the System C standard promoted by the OSCI (Open System C Initiative) and uses nSIM to simulate the ARC CPU core itself. Users can build a virtual SoC by combining System C models of peripherals and CPU cores. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [TB10x] Adapt device tree to new compatible stringChristian Ruppert2013-05-071-2/+2
| | | | | | | | | | | | | | | | | | | | The original device tree was written using a slightly different implementation of the fixed-factor-clock device tree binding. The compatible string must be modified in order to be compatible with the new implementation. Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [TB10x] Add support for TB10x platformChristian Ruppert2013-05-077-0/+257
| | | | | | | | | | | | | | | | | | | | | | Infrastructure required to make the Linux kernel compile and boot on the Abilis Systems TB10x series of SOCs based on ARC700 CPUs: - Kmake related files (Kconfig, Makefile, tb10x_defconfig) - TB10x platform initialisation Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [TB10x] Device tree of TB100 and TB101 Development KitsChristian Ruppert2013-05-075-0/+1190
| | | | | | | | | | | | | | | | | | | | | | These are the device tree files for the Abilis Systems TB100 and TB101 ICs and their respective development kit PCBs. These files are committed in preparation of the following patch set which adds support for these chips to the ARC platform. Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Prepare interrupt code for external controllersChristian Ruppert2013-05-072-2/+3
| | | | | | | | | | | | | | | | | | | | | | This patch adds some room for CPU-external interrupt controllers in the Linux interrupt space. Until now, only the 32 CPU internal interrupt lines were supported which does not allow for external interrupt controllers such as GPIO modules etc. Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Allow embedded arc-intc to be properly placed in DT intc hierarchyVineet Gupta2013-05-071-8/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arc-intc is initialized in arc common code as it is applicable to all platforms. However platforms with their own external intc still need to refer to it for correct DT interrupt tree hierarchy setup, e.g. static struct of_device_id __initdata tb10x_irq_ids[] = { { .compatible = "snps,arc700-intc", .data = dummy_init_irq }, { .compatible = "abilis,tb10x_ictl", .data = tb10x_init_irq }, {}, }; The fix is to use the generic irqchip framework to tie all irqchips in a special linker section and then call irqchip_init() which calls the DT of_irq_init() for all the intc in one go. That way the platform code need not be aware of arc-intc at all. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [cmdline] Don't overwrite u-boot provided bootargsVineet Gupta2013-05-071-8/+10
| | | | | | | | | | | | | | | | | | | | | | | | The existing code was wrong on several counts: * uboot provided bootargs were copied into @boot_command_line, only to be over-written by setup_machine_fdt(), effectively lost * @cmdline_p returned by setup_arch() to start_kernel() didn't include the DT /bootargs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [cmdline] Remove CONFIG_CMDLINEVineet Gupta2013-05-072-14/+2
| | | | | | | | | | | | | | Given that DeviceTree /bootargs can provide similar functionality, no point in providing duplicate infrastructure. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [plat-arcfpga] defconfig updateVineet Gupta2013-05-071-1/+2
| | | | | | | | | | | | | | * Allow initramfs path to be symlink * CONFIG_PREEMPT be default Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: unaligned access emulation broken if callee-reg dest of LD/STVineet Gupta2013-05-071-1/+3
| | | | | | | | | | | | | | | | | | The fixup code correctly updates the callee-regs on stack, but fails to unwind it into actual register file. Thus userspace won't see the update. Reported-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: unaligned access emulation error handling consolidationVineet Gupta2013-05-072-15/+6
| | | | | | | | | | | | | | If CONFIG_ARC_MISALIGN_ACCESS is not enabled, or if the fixup fails, call the same error handler: same signal/si_code to user (SIGBUS) Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Debug/crash-printing ImprovementsVineet Gupta2013-05-071-18/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Remove the line-break between scratch/callee-regs (sneaked in when we converted from printk to pr_* * Use %pS to print the symbol names of faulting PC (ret pseudo register) and BLINK (call return register) * Don't print user-vma for a kernel crash (only do it for print-fatal-signals based regfile dump) * Verbose print the Interrupt/Exception Enable/Active state * for main executable link address is 0x10000 based (vs. 0) thus offset of faulting PC needs to be adjusted Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: fix typo with clock speedNoam Camus2013-05-071-1/+1
| | | | | | | | | | Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Respect the cpu_id passed for fetching correct cpu infoNoam Camus2013-05-071-1/+1
| | | | | | | | | | Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Remove non existent refs to GENERIC_KERNEL_EXECVE & GENERIC_KERNEL_THREADAlexander Shiyan2013-05-071-2/+0
| | | | | | | | | | | | | | | | | | | | | | This tracks mainline commit ae903caae267 "Bury the conditionals from kernel_thread/kernel_execve series" which we missed out as ARC port was not yet mainline. [vgupta: commit log modified] Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [kbuild] Avoid DTB rebuilds if DTS are untouchedVineet Gupta2013-04-171-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, for every ARC kernel build I see the following: --------------->8----------------- DTB arch/arc/boot/dts/angel4.dtb.S AS arch/arc/boot/dts/angel4.dtb.o LD arch/arc/boot/dts/built-in.o rm arch/arc/boot/dts/angel4.dtb.S <-- forces rebuild next iter CHK kernel/config_data.h --------------->8----------------- This is because *.dts.S is intermediate file in dtb generation and is by default deleted by make which needs a ".SECONDARY" hint to NOT do so. This could have ideally been done in scripts/Makefile.lib - for benefit of all, however .SECONDARY doesn't seem to work with wildcards. Thanks to Stephen for suggesting .SECONDARY (vs .PRECIOUS) and making that work using a non wildcard version in arch makefile. Thanks to James Hogan for pointing out that *.dtb.S now needs to be added to clean-files Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [kbuild] Include Kconfig.binfmtVineet Gupta2013-04-091-3/+4
| | | | | | | | | | | | | | | | commit "fs: make binfmt support for #! scripts modular and removable" made support for #!scripts optional - thus need to include the Kconfig file to get all relevant BINFMT_* Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [kbuild] Allow platforms to disable LLSC for !SMP as wellVineet Gupta2013-04-091-6/+4
| | | | | | | | | | | | | | | | | | | | | | Currently ARC_HAS_LLSC can be influenced by platform for SMP only using ARC_HAS_COH_LLSC. For !SMP it defaults to "y". It turns out that some customers can't support it all, even in UP. So we change the semantics, and use a negative dependency ARC_CANT_LLSC. Any platform (independent of SMP or !SMP) can select it to disable LLSC. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [build] Fix warnings with CONFIG_DEBUG_SECTION_MISMATCHVineet Gupta2013-04-094-10/+10
| | | | | | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [build] Build failure with !KPROBESChristian Ruppert2013-04-091-0/+1
| | | | | | | | | | | | | | | | arch/arc/kernel/traps.c no longer compiles without explicitly including asm/kprobes.h Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [build] Allow uncompressed uImageVineet Gupta2013-04-092-5/+17
| | | | | | | | | | | | | | | | | | | | | | The existing uImage target always generates gzip compressed image which drags bootup for some very slow FPGA customer boards. So introduce seperate make targets:uImage.{bin,gz} with uncompressed being default. Also tie gz generation to CONFIG_KERNEL_GZIP, which a platform can select in it's Kconfig if it wishes gz to be default. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [build] cleanup Makefile a bitVineet Gupta2013-04-092-4/+3
| | | | | | | | Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: [build] silence make defconfig warnings with host gcc 4.7Vineet Gupta2013-04-091-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We do cross compiles for ARC Linux. With gcc 4.7, a make defconfig spews out the following: ------------------->8-------------------------- make ARCH=arc defconfig gcc: error: unrecognized command line option '-marc600' gcc: error: unrecognized command line option '-mA7' gcc: error: unrecognized command line option '-mno-sdata' gcc: error: unrecognized command line option '-mno-mpy' *** Default configuration is based on 'fpga_defconfig' ------------------->8-------------------------- This apparently is coming from LIBGCC line - which is strange to be invoked for defconfig generation. Reported-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: remove #ifdef-ed out include of dead headerPaul Bolle2013-04-091-3/+0
| | | | | | | | | | | | | | | | | | There's no (Kconfig) macro CONFIG_BLOCK_DEV_RAM. (CONFIG_BLK_DEV_RAM does exist though.) But linux/blk.h got killed in 2005 anyway (in a patch titled "kill blk.h"), so these three lines can be removed. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Remove duplicate inclusion of header filesSachin Kamat2013-04-093-3/+0
| | | | | | | | | | | | | | Some header files were included twice in the same file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Fix coding style issuesSachin Kamat2013-04-093-5/+5
| | | | | | | | | | | | | | | | | | | | | | Fixes the following coding style issues as detected by checkpatch: ERROR: space required before the open parenthesis '(' ERROR: "foo * bar" should be "foo *bar" WARNING: space prohibited between function name and open parenthesis '(' WARNING: please, no spaces at the start of a line Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Use <linux/*> headers instead of <asm/*>Sachin Kamat2013-04-095-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | Silences the following checkpatch warnings: WARNING: Use #include <linux/ptrace.h> instead of <asm/ptrace.h> WARNING: Use #include <linux/kprobes.h> instead of <asm/kprobes.h> WARNING: Use #include <linux/kgdb.h> instead of <asm/kgdb.h> WARNING: Use #include <linux/uaccess.h> instead of <asm/uaccess.h> WARNING: Use #include <linux/cache.h> instead of <asm/cache.h> Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
| * ARC: Remove unneeded version.h header includeSachin Kamat2013-04-091-1/+0
| | | | | | | | | | | | | | | | version.h header file inclusion is not necessary as detected by versioncheck script. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
* | arc, print-fatal-signals: reduce duplicated informationVineet Gupta2013-04-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After the recent generic debug info on dump_stack() and friends, arc is printing duplicate information on debug dumps. [ARCLinux]$ ./crash crash/50: potentially unexpected fatal signal 11. <-- [1] /sbin/crash, TGID 50 <-- [2] Pid: 50, comm: crash Not tainted 3.9.0-rc4+ #132 <-- [3] ... Remove them. [tj@kernel.org: updated patch desc] Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: David S. Miller <davem@davemloft.net> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | dump_stack: unify debug information printed by show_regs()Tejun Heo2013-04-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | show_regs() is inherently arch-dependent but it does make sense to print generic debug information and some archs already do albeit in slightly different forms. This patch introduces a generic function to print debug information from show_regs() so that different archs print out the same information and it's much easier to modify what's printed. show_regs_print_info() prints out the same debug info as dump_stack() does plus task and thread_info pointers. * Archs which didn't print debug info now do. alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r, metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc, um, xtensa * Already prints debug info. Replaced with show_regs_print_info(). The printed information is superset of what used to be there. arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86 * s390 is special in that it used to print arch-specific information along with generic debug info. Heiko and Martin think that the arch-specific extra isn't worth keeping s390 specfic implementation. Converted to use the generic version. Note that now all archs print the debug info before actual register dumps. An example BUG() dump follows. kernel BUG at /work/os/work/kernel/workqueue.c:4841! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7 Hardware name: empty empty/S3992, BIOS 080011 10/26/2007 task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000 RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6 RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246 RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001 RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650 0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760 Call Trace: [<ffffffff81000312>] do_one_initcall+0x122/0x170 [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8 [<ffffffff81c47760>] ? rest_init+0x140/0x140 [<ffffffff81c4776e>] kernel_init+0xe/0xf0 [<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0 [<ffffffff81c47760>] ? rest_init+0x140/0x140 ... v2: Typo fix in x86-32. v3: CPU number dropped from show_regs_print_info() as dump_stack_print_info() has been updated to print it. s390 specific implementation dropped as requested by s390 maintainers. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | dump_stack: consolidate dump_stack() implementations and unify their behaviorsTejun Heo2013-04-301-7/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Both dump_stack() and show_stack() are currently implemented by each architecture. show_stack(NULL, NULL) dumps the backtrace for the current task as does dump_stack(). On some archs, dump_stack() prints extra information - pid, utsname and so on - in addition to the backtrace while the two are identical on other archs. The usages in arch-independent code of the two functions indicate show_stack(NULL, NULL) should print out bare backtrace while dump_stack() is used for debugging purposes when something went wrong, so it does make sense to print additional information on the task which triggered dump_stack(). There's no reason to require archs to implement two separate but mostly identical functions. It leads to unnecessary subtle information. This patch expands the dummy fallback dump_stack() implementation in lib/dump_stack.c such that it prints out debug information (taken from x86) and invokes show_stack(NULL, NULL) and drops arch-specific dump_stack() implementations in all archs except blackfin. Blackfin's dump_stack() does something wonky that I don't understand. Debug information can be printed separately by calling dump_stack_print_info() so that arch-specific dump_stack() implementation can still emit the same debug information. This is used in blackfin. This patch brings the following behavior changes. * On some archs, an extra level in backtrace for show_stack() could be printed. This is because the top frame was determined in dump_stack() on those archs while generic dump_stack() can't do that reliably. It can be compensated by inlining dump_stack() but not sure whether that'd be necessary. * Most archs didn't use to print debug info on dump_stack(). They do now. An example WARN dump follows. WARNING: at kernel/workqueue.c:4841 init_workqueues+0x35/0x505() Hardware name: empty Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #9 0000000000000009 ffff88007c861e08 ffffffff81c614dc ffff88007c861e48 ffffffff8108f50f ffffffff82228240 0000000000000040 ffffffff8234a03c 0000000000000000 0000000000000000 0000000000000000 ffff88007c861e58 Call Trace: [<ffffffff81c614dc>] dump_stack+0x19/0x1b [<ffffffff8108f50f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8108f56a>] warn_slowpath_null+0x1a/0x20 [<ffffffff8234a071>] init_workqueues+0x35/0x505 ... v2: CPU number added to the generic debug info as requested by s390 folks and dropped the s390 specific dump_stack(). This loses %ksp from the debug message which the maintainers think isn't important enough to keep the s390-specific dump_stack() implementation. dump_stack_print_info() is moved to kernel/printk.c from lib/dump_stack.c. Because linkage is per objecct file, dump_stack_print_info() living in the same lib file as generic dump_stack() means that archs which implement custom dump_stack() - at this point, only blackfin - can't use dump_stack_print_info() as that will bring in the generic version of dump_stack() too. v1 The v1 patch broke build on blackfin due to this issue. The build breakage was reported by Fengguang Wu. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390 bits] Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'for-linus' of ↵Linus Torvalds2013-04-302-2/+2
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree updates from Jiri Kosina: "Usual stuff, mostly comment fixes, typo fixes, printk fixes and small code cleanups" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (45 commits) mm: Convert print_symbol to %pSR gfs2: Convert print_symbol to %pSR m32r: Convert print_symbol to %pSR iostats.txt: add easy-to-find description for field 6 x86 cmpxchg.h: fix wrong comment treewide: Fix typo in printk and comments doc: devicetree: Fix various typos docbook: fix 8250 naming in device-drivers pata_pdc2027x: Fix compiler warning treewide: Fix typo in printks mei: Fix comments in drivers/misc/mei treewide: Fix typos in kernel messages pm44xx: Fix comment for "CONFIG_CPU_IDLE" doc: Fix typo "CONFIG_CGROUP_CGROUP_MEMCG_SWAP" mmzone: correct "pags" to "pages" in comment. kernel-parameters: remove outdated 'noresidual' parameter Remove spurious _H suffixes from ifdef comments sound: Remove stray pluses from Kconfig file radio-shark: Fix printk "CONFIG_LED_CLASS" doc: put proper reference to CONFIG_MODULE_SIG_ENFORCE ...
| * | treewide: Fix typos in printk and commentMasanari Iida2013-03-181-1/+1
| | | | | | | | | | | | | | | Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| * | arc: fix incorrect ifdef commentPaul Bolle2013-03-181-1/+1
| | | | | | | | | | | | | | | Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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