summaryrefslogtreecommitdiffstats
path: root/fs/proc
Commit message (Collapse)AuthorAgeFilesLines
* [S390] /proc/stat idle field for idle cpusMartin Schwidefsky2009-04-231-0/+5
| | | | | | | | | | | | | The cpu idle field in the output of /proc/stat is too small for cpus that have been idle for more than a tick. Add the architecture hook arch_idle_time that allows to add the not accounted idle time of a sleeping cpu without waking the cpu. The s390 implementation of arch_idle_time uses the already existing s390_idle_data per_cpu variable to find the sleep time of a neighboring idle cpu. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* proc: mounts_poll() make consistent to mdstat_pollKOSAKI Motohiro2009-04-161-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | In recently sysfs_poll discussion, Neil Brown pointed out /proc/mounts also should be fixed. SUSv3 says "Regular files shall always poll TRUE for reading and writing". see http://www.opengroup.org/onlinepubs/009695399/functions/poll.html Then, mounts_poll()'s default should be "POLLIN | POLLRDNORM". it mean always readable. In addition, event trigger should use "POLLERR | POLLPRI" instead POLLERR. it makes consistent to mdstat_poll() and sysfs_poll(). and, select(2) can handle POLLPRI easily. Reported-by: Neil Brown <neilb@suse.de> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Ram Pai <linuxram@us.ibm.com> Cc: Miklos Szeredi <mszeredi@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* nommu: fix typo vma->pg_off to vma->vm_pgoffNobuhiro Iwamatsu2009-04-081-1/+1
| | | | | | | | | | | | | 6260a4b0521a41189b2c2a8119096c1e21dbdf2c ("/proc/pid/maps: don't show pgoff of pure ANON VMAs" had a typo. fs/proc/task_nommu.c:138: error: 'struct vm_area_struct' has no member named 'pg_off' distcc[21484] ERROR: compile fs/proc/task_nommu.c on sprygo/32 failed Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* /proc/pid/maps: don't show pgoff of pure ANON VMAsKAMEZAWA Hiroyuki2009-04-072-2/+6
| | | | | | | | | | | | | | | | | | Recently, it's argued that what proc/pid/maps shows is ugly when a 32bit binary runs on 64bit host. /proc/pid/maps outputs vma's pgoff member but vma->pgoff is of no use information is the vma is for ANON. With this patch, /proc/pid/maps shows just 0 if no file backing store. [akpm@linux-foundation.org: coding-style fixes] [kamezawa.hiroyu@jp.fujitsu.com: coding-style fixes] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mike Waychison <mikew@google.com> Reported-by: Ying Han <yinghan@google.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2009-04-031-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: (28 commits) trivial: Update my email address trivial: NULL noise: drivers/mtd/tests/mtd_*test.c trivial: NULL noise: drivers/media/dvb/frontends/drx397xD_fw.h trivial: Fix misspelling of "Celsius". trivial: remove unused variable 'path' in alloc_file() trivial: fix a pdlfush -> pdflush typo in comment trivial: jbd header comment typo fix for JBD_PARANOID_IOFAIL trivial: wusb: Storage class should be before const qualifier trivial: drivers/char/bsr.c: Storage class should be before const qualifier trivial: h8300: Storage class should be before const qualifier trivial: fix where cgroup documentation is not correctly referred to trivial: Give the right path in Documentation example trivial: MTD: remove EOL from MODULE_DESCRIPTION trivial: Fix typo in bio_split()'s documentation trivial: PWM: fix of #endif comment trivial: fix typos/grammar errors in Kconfig texts trivial: Fix misspelling of firmware trivial: cgroups: documentation typo and spelling corrections trivial: Update contact info for Jochen Hein trivial: fix typo "resgister" -> "register" ...
| * trivial: fix typo "kernal" -> "kernel"Uwe Kleine-Koenig2009-03-301-1/+1
| | | | | | | | | | Signed-off-by: Uwe Kleine-Koenig <Uwe.Kleine-Koenig@digi.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | Merge branch 'for-linus' of ↵Linus Torvalds2009-04-022-1/+3
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: Remove two unneeded exports and make two symbols static in fs/mpage.c Cleanup after commit 585d3bc06f4ca57f975a5a1f698f65a45ea66225 Trim includes of fdtable.h Don't crap into descriptor table in binfmt_som Trim includes in binfmt_elf Don't mess with descriptor table in load_elf_binary() Get rid of indirect include of fs_struct.h New helper - current_umask() check_unsafe_exec() doesn't care about signal handlers sharing New locking/refcounting for fs_struct Take fs_struct handling to new file (fs/fs_struct.c) Get rid of bumping fs_struct refcount in pivot_root(2) Kill unsharing fs_struct in __set_personality()
| * | Get rid of indirect include of fs_struct.hAl Viro2009-03-312-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | Don't pull it in sched.h; very few files actually need it and those can include directly. sched.h itself only needs forward declaration of struct fs_struct; Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | New locking/refcounting for fs_structAl Viro2009-03-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * all changes of current->fs are done under task_lock and write_lock of old fs->lock * refcount is not atomic anymore (same protection) * its decrements are done when removing reference from current; at the same time we decide whether to free it. * put_fs_struct() is gone * new field - ->in_exec. Set by check_unsafe_exec() if we are trying to do execve() and only subthreads share fs_struct. Cleared when finishing exec (success and failure alike). Makes CLONE_FS fail with -EAGAIN if set. * check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread is in progress. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | nommu: fix a number of issues with the per-MM VMA patchDavid Howells2009-04-022-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix a number of issues with the per-MM VMA patch: (1) Make mmap_pages_allocated an atomic_long_t, just in case this is used on a NOMMU system with more than 2G pages. Makes no difference on a 32-bit system. (2) Report vma->vm_pgoff * PAGE_SIZE as a 64-bit value, not a 32-bit value, lest it overflow. (3) Move the allocation of the vm_area_struct slab back for fork.c. (4) Use KMEM_CACHE() for both vm_area_struct and vm_region slabs. (5) Use BUG_ON() rather than if () BUG(). (6) Make the default validate_nommu_regions() a static inline rather than a #define. (7) Make free_page_series()'s objection to pages with a refcount != 1 more informative. (8) Adjust the __put_nommu_region() banner comment to indicate that the semaphore must be held for writing. (9) Limit the number of warnings about munmaps of non-mmapped regions. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Howells <dhowells@redhat.com> Cc: Greg Ungerer <gerg@snapgear.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | proc tty: remove struct tty_operations::read_procAlexey Dobriyan2009-04-011-14/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | struct tty_operations::proc_fops took it's place and there is one less create_proc_read_entry() user now! Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | proc tty: add struct tty_operations::proc_fopsAlexey Dobriyan2009-04-011-7/+13
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | Used for gradual switch of TTY drivers from using ->read_proc which helps with gradual switch from ->read_proc for the whole tree. As side effect, fix possible race condition when ->data initialized after PDE is hooked into proc tree. ->proc_fops takes precedence over ->read_proc. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Revert "proc: revert /proc/uptime to ->read_proc hook"Alexey Dobriyan2009-03-311-20/+18
| | | | | | | | | | | | | | | | This reverts commit 6c87df37dcb9c6c33923707fa5191e0a65874d60. proc files implemented through seq_file do pread(2) now. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* | proc 2/2: remove struct proc_dir_entry::ownerAlexey Dobriyan2009-03-312-17/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* | proc 1/2: do PDE usecounting even for ->read_proc, ->write_procAlexey Dobriyan2009-03-313-11/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | struct proc_dir_entry::owner is going to be removed. Now it's only necessary to protect PDEs which are using ->read_proc, ->write_proc hooks. However, ->owner assignments are racy and make it very easy for someone to switch ->owner on live PDE (as some subsystems do) without fixing refcounts and so on. http://bugzilla.kernel.org/show_bug.cgi?id=12454 So, ->owner is on death row. Proxy file operations exist already (proc_file_operations), just bump usecount when necessary. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* | proc: fix sparse warnings in pagemap_read()Milind Arun Choudhary2009-03-311-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fs/proc/task_mmu.c:696:12: warning: cast removes address space of expression fs/proc/task_mmu.c:696:9: warning: incorrect type in assignment (different address spaces) fs/proc/task_mmu.c:696:9: expected unsigned long long [noderef] [usertype] <asn:1>*out fs/proc/task_mmu.c:696:9: got unsigned long long [usertype] *<noident> fs/proc/task_mmu.c:697:12: warning: cast removes address space of expression fs/proc/task_mmu.c:697:9: warning: incorrect type in assignment (different address spaces) fs/proc/task_mmu.c:697:9: expected unsigned long long [noderef] [usertype] <asn:1>*end fs/proc/task_mmu.c:697:9: got unsigned long long [usertype] *<noident> fs/proc/task_mmu.c:723:12: warning: cast removes address space of expression fs/proc/task_mmu.c:723:26: error: subtraction of different types can't work (different address spaces) fs/proc/task_mmu.c:725:24: error: subtraction of different types can't work (different address spaces) Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* | proc: move fs/proc/inode-alloc.txt comment into a source fileRandy Dunlap2009-03-312-14/+15
|/ | | | | | | | so that people will realize that it exists and can update it as needed. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* fix setuid sometimes wouldn'tHugh Dickins2009-03-281-34/+16
| | | | | | | | | | | | | | | | | | | | | | | | check_unsafe_exec() also notes whether the fs_struct is being shared by more threads than will get killed by the exec, and if so sets LSM_UNSAFE_SHARE to make bprm_set_creds() careful about euid. But /proc/<pid>/cwd and /proc/<pid>/root lookups make transient use of get_fs_struct(), which also raises that sharing count. This might occasionally cause a setuid program not to change euid, in the same way as happened with files->count (check_unsafe_exec also looks at sighand->count, but /proc doesn't raise that one). We'd prefer exec not to unshare fs_struct: so fix this in procfs, replacing get_fs_struct() by get_fs_path(), which does path_get while still holding task_lock, instead of raising fs->count. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: stable@kernel.org ___ fs/proc/base.c | 50 +++++++++++++++-------------------------------- 1 file changed, 16 insertions(+), 34 deletions(-) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* vfs: simple_set_mnt() should return voidSukadev Bhattiprolu2009-03-271-1/+2
| | | | | | | | | | | | | | | | | | | | | | | simple_set_mnt() is defined as returning 'int' but always returns 0. Callers assume simple_set_mnt() never fails and don't properly cleanup if it were to _ever_ fail. For instance, get_sb_single() and get_sb_nodev() should: up_write(sb->s_unmount); deactivate_super(sb); if simple_set_mnt() fails. Since simple_set_mnt() never fails, would be cleaner if it did not return anything. [akpm@linux-foundation.org: fix build] Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* constify dentry_operations: procfsAl Viro2009-03-273-6/+6
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Avoid 64-bit "switch()" statements on 32-bit architecturesLinus Torvalds2009-03-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Commit ee6f779b9e0851e2f7da292a9f58e0095edf615a ("filp->f_pos not correctly updated in proc_task_readdir") changed the proc code to use filp->f_pos directly, rather than through a temporary variable. In the process, that caused the operations to be done on the full 64 bits, even though the offset is never that big. That's all fine and dandy per se, but for some unfathomable reason gcc generates absolutely horrid code when using 64-bit values in switch() statements. To the point of actually calling out to gcc helper functions like __cmpdi2 rather than just doing the trivial comparisons directly the way gcc does for normal compares. At which point we get link failures, because we really don't want to support that kind of crazy code. Fix this by just casting the f_pos value to "unsigned long", which is plenty big enough for /proc, and avoids the gcc code generation issue. Reported-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Zhang Le <r0bertz@gentoo.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* filp->f_pos not correctly updated in proc_task_readdirZhang Le2009-03-161-9/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | filp->f_pos only get updated at the end of the function. Thus d_off of those dirents who are in the middle will be 0, and this will cause a problem in glibc's readdir implementation, specifically endless loop. Because when overflow occurs, f_pos will be set to next dirent to read, however it will be 0, unless the next one is the last one. So it will start over again and again. There is a sample program in man 2 gendents. This is the output of the program running on a multithread program's task dir before this patch is applied: $ ./a.out /proc/3807/task --------------- nread=128 --------------- i-node# file type d_reclen d_off d_name 506442 directory 16 1 . 506441 directory 16 0 .. 506443 directory 16 0 3807 506444 directory 16 0 3809 506445 directory 16 0 3812 506446 directory 16 0 3861 506447 directory 16 0 3862 506448 directory 16 8 3863 This is the output after this patch is applied $ ./a.out /proc/3807/task --------------- nread=128 --------------- i-node# file type d_reclen d_off d_name 506442 directory 16 1 . 506441 directory 16 2 .. 506443 directory 16 3 3807 506444 directory 16 4 3809 506445 directory 16 5 3812 506446 directory 16 6 3861 506447 directory 16 7 3862 506448 directory 16 8 3863 Signed-off-by: Zhang Le <r0bertz@gentoo.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* proc: fix kflags to uflags copying in /proc/kpageflagsWu Fengguang2009-03-111-1/+1
| | | | | | | | | | | | | Fix kpf_copy_bit(src,dst) to be kpf_copy_bit(dst,src) to match the actual call patterns, e.g. kpf_copy_bit(kflags, KPF_LOCKED, PG_locked). This misplacement of src/dst only affected reporting of PG_writeback, PG_reclaim and PG_buddy. For others kflags==uflags so not affected. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* proc: fix PG_locked reporting in /proc/kpageflagsHelge Bahmann2009-02-241-1/+1
| | | | | | | | Expr always evaluates to zero. Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* proc: proc_get_inode should de_put when inode already initializedKrzysztof Sachanowicz2009-02-231-1/+3
| | | | | | | | | | | | | | | | de_get is called before every proc_get_inode, but corresponding de_put is called only when dropping last reference to an inode. This might cause something like remove_proc_entry: /proc/stats busy, count=14496 to be printed to the syslog. The fix is to call de_put in case of an already initialized inode in proc_get_inode. Signed-off-by: Krzysztof Sachanowicz <analyzer1@gmail.com> Tested-by: Marcin Pilipczuk <marcin.pilipczuk@gmail.com> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommuLinus Torvalds2009-01-094-74/+125
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu: NOMMU: Support XIP on initramfs NOMMU: Teach kobjsize() about VMA regions. FLAT: Don't attempt to expand the userspace stack to fill the space allocated FDPIC: Don't attempt to expand the userspace stack to fill the space allocated NOMMU: Improve procfs output using per-MM VMAs NOMMU: Make mmap allocation page trimming behaviour configurable. NOMMU: Make VMAs per MM as for MMU-mode linux NOMMU: Delete askedalloc and realalloc variables NOMMU: Rename ARM's struct vm_region NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()
| * NOMMU: Improve procfs output using per-MM VMAsDavid Howells2009-01-081-10/+22
| | | | | | | | | | | | | | | | Improve procfs output using per-MM VMAs for process memory accounting. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Mike Frysinger <vapier.adi@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org>
| * NOMMU: Make VMAs per MM as for MMU-mode linuxDavid Howells2009-01-084-74/+113
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make VMAs per mm_struct as for MMU-mode linux. This solves two problems: (1) In SYSV SHM where nattch for a segment does not reflect the number of shmat's (and forks) done. (2) In mmap() where the VMA's vm_mm is set to point to the parent mm by an exec'ing process when VM_EXECUTABLE is specified, regardless of the fact that a VMA might be shared and already have its vm_mm assigned to another process or a dead process. A new struct (vm_region) is introduced to track a mapped region and to remember the circumstances under which it may be shared and the vm_list_struct structure is discarded as it's no longer required. This patch makes the following additional changes: (1) Regions are now allocated with alloc_pages() rather than kmalloc() and with no recourse to __GFP_COMP, so the pages are not composite. Instead, each page has a reference on it held by the region. Anything else that is interested in such a page will have to get a reference on it to retain it. When the pages are released due to unmapping, each page is passed to put_page() and will be freed when the page usage count reaches zero. (2) Excess pages are trimmed after an allocation as the allocation must be made as a power-of-2 quantity of pages. (3) VMAs are added to the parent MM's R/B tree and mmap lists. As an MM may end up with overlapping VMAs within the tree, the VMA struct address is appended to the sort key. (4) Non-anonymous VMAs are now added to the backing inode's prio list. (5) Holes may be punched in anonymous VMAs with munmap(), releasing parts of the backing region. The VMA and region structs will be split if necessary. (6) sys_shmdt() only releases one attachment to a SYSV IPC shared memory segment instead of all the attachments at that addresss. Multiple shmat()'s return the same address under NOMMU-mode instead of different virtual addresses as under MMU-mode. (7) Core dumping for ELF-FDPIC requires fewer exceptions for NOMMU-mode. (8) /proc/maps is now the global list of mapped regions, and may list bits that aren't actually mapped anywhere. (9) /proc/meminfo gains a line (tagged "MmapCopy") that indicates the amount of RAM currently allocated by mmap to hold mappable regions that can't be mapped directly. These are copies of the backing device or file if not anonymous. These changes make NOMMU mode more similar to MMU mode. The downside is that NOMMU mode requires some extra memory to track things over NOMMU without this patch (VMAs are no longer shared, and there are now region structs). Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Mike Frysinger <vapier.adi@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org>
* | vmcore: remove saved_max_pfn checkMagnus Damm2009-01-081-2/+0
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove the saved_max_pfn check from the /proc/vmcore function read_from_oldmem(). No need to verify, we should be able to just trust that "elfcorehdr=" is correctly passed to the crash kernel on the kernel command line like we do with other parameters. The read_from_oldmem() function in fs/proc/vmcore.c is quite similar to read_from_oldmem() in drivers/char/mem.c, but only in the latter it makes sense to use saved_max_pfn. For oldmem it is used to determine when to stop reading. For vmcore we already have the elf header info pointing out the physical memory regions, no need to pass the end-of- old-memory twice. Removing the saved_max_pfn check from vmcore makes it possible for architectures to skip oldmem but still support crash dump through vmcore - without the need for the old saved_max_pfn cruft. Architectures that want to play safe can do the saved_max_pfn check in copy_oldmem_page(). Not sure why anyone would want to do that, but that's even safer than today - the saved_max_pfn check in vmcore removed by this patch only checks the first page. Signed-off-by: Magnus Damm <damm@igel.co.jp> Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Simon Horman <horms@verge.net.au> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'proc-linus' of ↵Linus Torvalds2009-01-075-118/+134
|\ | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc * 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc: proc: remove write-only variable in proc_pident_lookup() proc: fix sparse warning proc: add /proc/*/stack proc: remove '##' usage proc: remove useless WARN_ONs proc: stop using BKL
| * proc: remove write-only variable in proc_pident_lookup()WANG Cong2009-01-051-2/+0
| | | | | | | | | | Signed-off-by: WANG Cong <wangcong@zeuux.org> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
| * proc: fix sparse warningHannes Eder2009-01-051-2/+2
| | | | | | | | | | | | | | fs/proc/base.c:312:4: warning: do-while statement is not a compound statement Signed-off-by: Hannes Eder <hannes@hanneseder.net> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
| * proc: add /proc/*/stackKen Chen2009-01-051-0/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | /proc/*/stack adds the ability to query a task's stack trace. It is more useful than /proc/*/wchan as it provides full stack trace instead of single depth. Example output: $ cat /proc/self/stack [<c010a271>] save_stack_trace_tsk+0x17/0x35 [<c01827b4>] proc_pid_stack+0x4a/0x76 [<c018312d>] proc_single_show+0x4a/0x5e [<c016bdec>] seq_read+0xf3/0x29f [<c015a004>] vfs_read+0x6d/0x91 [<c015a0c1>] sys_read+0x3b/0x60 [<c0102eda>] syscall_call+0x7/0xb [<ffffffff>] 0xffffffff [add save_stack_trace_tsk() on mips, ACK Ralf --adobriyan] Signed-off-by: Ken Chen <kenchen@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
| * proc: remove '##' usageAlexey Dobriyan2009-01-051-93/+90
| | | | | | | | | | | | Inability to jump to /proc/*/foo handlers with ctags is annoying. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
| * proc: remove useless WARN_ONsAlexey Dobriyan2009-01-051-4/+0
| | | | | | | | | | | | NULL "struct inode *" means VFS passed NULL inode to ->open. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
| * proc: stop using BKLAlexey Dobriyan2009-01-054-17/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are four BKL users in proc: de_put(), proc_lookup_de(), proc_readdir_de(), proc_root_readdir(), 1) de_put() ----------- de_put() is classic atomic_dec_and_test() refcount wrapper -- no BKL needed. BKL doesn't matter to possible refcount leak as well. 2) proc_lookup_de() ------------------- Walking PDE list is protected by proc_subdir_lock(), proc_get_inode() is potentially blocking, all callers of proc_lookup_de() eventually end up from ->lookup hooks which is protected by directory's ->i_mutex -- BKL doesn't protect anything. 3) proc_readdir_de() -------------------- "." and ".." part doesn't need BKL, walking PDE list is under proc_subdir_lock, calling filldir callback is potentially blocking because it writes to luserspace. All proc_readdir_de() callers eventually come from ->readdir hook which is under directory's ->i_mutex -- BKL doesn't protect anything. 4) proc_root_readdir_de() ------------------------- proc_root_readdir_de is ->readdir hook, see (3). Since readdir hooks doesn't use BKL anymore, switch to generic_file_llseek, since it also takes directory's i_mutex. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2009-01-071-1/+1
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: (24 commits) trivial: chack -> check typo fix in main Makefile trivial: Add a space (and a comma) to a printk in 8250 driver trivial: Fix misspelling of "firmware" in docs for ncr53c8xx/sym53c8xx trivial: Fix misspelling of "firmware" in powerpc Makefile trivial: Fix misspelling of "firmware" in usb.c trivial: Fix misspelling of "firmware" in qla1280.c trivial: Fix misspelling of "firmware" in a100u2w.c trivial: Fix misspelling of "firmware" in megaraid.c trivial: Fix misspelling of "firmware" in ql4_mbx.c trivial: Fix misspelling of "firmware" in acpi_memhotplug.c trivial: Fix misspelling of "firmware" in ipw2100.c trivial: Fix misspelling of "firmware" in atmel.c trivial: Fix misspelled firmware in Kconfig trivial: fix an -> a typos in documentation and comments trivial: fix then -> than typos in comments and documentation trivial: update Jesper Juhl CREDITS entry with new email trivial: fix singal -> signal typo trivial: Fix incorrect use of "loose" in event.c trivial: printk: fix indentation of new_text_line declaration trivial: rtc-stk17ta8: fix sparse warning ...
| * | trivial: fix then -> than typos in comments and documentationFrederik Schwarzer2009-01-061-1/+1
| | | | | | | | | | | | | | | | | | | | | - (better, more, bigger ...) then -> (...) than Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | mm: report the MMU pagesize in /proc/pid/smapsMel Gorman2009-01-061-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The KernelPageSize entry in /proc/pid/smaps is the pagesize used by the kernel to back a VMA. This matches the size used by the MMU in the majority of cases. However, one counter-example occurs on PPC64 kernels whereby a kernel using 64K as a base pagesize may still use 4K pages for the MMU on older processor. To distinguish, this patch reports MMUPageSize as the pagesize used by the MMU in /proc/pid/smaps. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | mm: report the pagesize backing a VMA in /proc/pid/smapsMel Gorman2009-01-061-2/+4
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | It is useful to verify a hugepage-aware application is using the expected pagesizes for its memory regions. This patch creates an entry called KernelPageSize in /proc/pid/smaps that is the size of page used by the kernel to back a VMA. The entry is not called PageSize as it is possible the MMU uses a different size. This extension should not break any sensible parser that skips lines containing unrecognised information. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* / zero i_uid/i_gid on inode allocationAl Viro2009-01-052-5/+0
|/ | | | | | | | | ... and don't bother in callers. Don't bother with zeroing i_blocks, while we are at it - it's already been zeroed. i_mode is not worth the effort; it has no common default value. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'irq-fixes-for-linus-4' of ↵Linus Torvalds2008-12-311-10/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sparseirq: move __weak symbols into separate compilation unit sparseirq: work around __weak alias bug sparseirq: fix hang with !SPARSE_IRQ sparseirq: set lock_class for legacy irq when sparse_irq is selected sparseirq: work around compiler optimizing away __weak functions sparseirq: fix desc->lock init sparseirq: do not printk when migrating IRQ descriptors sparseirq: remove duplicated arch_early_irq_init() irq: simplify for_each_irq_desc() usage proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c irq: for_each_irq_desc() move to irqnr.h hrtimer: remove #include <linux/irq.h>
| * proc: remove ifdef CONFIG_SPARSE_IRQ from stat.cKOSAKI Motohiro2008-12-261-10/+1
| | | | | | | | | | | | | | | | | | | | | | Impact: cleanup irq_desc can be NULL when CONFIG_SPARSE_IRQ=y only. therefore, NULL checking can move into kstat_irqs_cpu() of SPARSE_IRQ version. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: "Yinghai Lu" <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | Merge branch 'irq-core-for-linus' of ↵Linus Torvalds2008-12-301-4/+12
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, sparseirq: clean up Kconfig entry x86: turn CONFIG_SPARSE_IRQ off by default sparseirq: fix numa_migrate_irq_desc dependency and comments sparseirq: add kernel-doc notation for new member in irq_desc, -v2 locking, irq: enclose irq_desc_lock_class in CONFIG_LOCKDEP sparseirq, xen: make sure irq_desc is allocated for interrupts sparseirq: fix !SMP building, #2 x86, sparseirq: move irq_desc according to smp_affinity, v7 proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQ sparse irqs: add irqnr.h to the user headers list sparse irqs: handle !GENIRQ platforms sparseirq: fix !SMP && !PCI_MSI && !HT_IRQ build sparseirq: fix Alpha build failure sparseirq: fix typo in !CONFIG_IO_APIC case x86, MSI: pass irq_cfg and irq_desc x86: MSI start irq numbering from nr_irqs_gsi x86: use NR_IRQS_LEGACY sparse irq_desc[] array: core kernel and x86 changes genirq: record IRQ_LEVEL in irq_desc[] irq.h: remove padding from irq_desc on 64bits
| *-. Merge branches 'irq/sparseirq', 'irq/genirq' and 'irq/urgent'; commit ↵Ingo Molnar2008-12-253-7/+15
| |\ \ | | | | | | | | | | | | 'v2.6.28' into irq/core
| | * | proc: enclose desc variable of show_stat() in CONFIG_SPARSE_IRQKOSAKI Motohiro2008-12-161-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: restructure code to fix compiler warning commit 240d367b4e6c6e3c5075e034db14dba60a6f5fa7 moved desc usage point into #ifdef CONFIG_SPARSE_IRQ. Eliminate the desc variable, otherwise following warning happens: fs/proc/stat.c: In function 'show_stat': fs/proc/stat.c:31: warning: unused variable 'desc' [ akpm: cleaned up the patch to remove #ifdef ] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | sparseirq: fix Alpha build failureYinghai Lu2008-12-091-7/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: build fix on Alpha -tip testing found this build failure on the Alpha defconfig: /home/mingo/tip/fs/proc/stat.c: In function 'show_stat': /home/mingo/tip/fs/proc/stat.c:48: error: implicit declaration of function 'for_each_irq_desc' /home/mingo/tip/fs/proc/stat.c:48: error: expected ';' before '{' token can not use irq_desc() in stat.c on older architectures. Signed-off-by: Yinghai Lu <yinghai@kernel.orgg> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | sparse irq_desc[] array: core kernel and x86 changesYinghai Lu2008-12-081-6/+11
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: new feature Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with NR_CPUS set to large values. The goal is to be able to scale up to much larger NR_IRQS value without impacting the (important) common case. To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of irq_desc pointers. When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc, this also makes the IRQ descriptors NUMA-local (to the site that calls request_irq()). This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now uses desc->chip_data for x86 to store irq_cfg. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | | Merge branch 'next' of ↵Linus Torvalds2008-12-281-2/+1
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (144 commits) powerpc/44x: Support 16K/64K base page sizes on 44x powerpc: Force memory size to be a multiple of PAGE_SIZE powerpc/32: Wire up the trampoline code for kdump powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M powerpc/32: Allow __ioremap on RAM addresses for kdump kernel powerpc/32: Setup OF properties for kdump powerpc/32/kdump: Implement crash_setup_regs() using ppc_save_regs() powerpc: Prepare xmon_save_regs for use with kdump powerpc: Remove default kexec/crash_kernel ops assignments powerpc: Make default kexec/crash_kernel ops implicit powerpc: Setup OF properties for ppc32 kexec powerpc/pseries: Fix cpu hotplug powerpc: Fix KVM build on ppc440 powerpc/cell: add QPACE as a separate Cell platform powerpc/cell: fix build breakage with CONFIG_SPUFS disabled powerpc/mpc5200: fix error paths in PSC UART probe function powerpc/mpc5200: add rts/cts handling in PSC UART driver powerpc/mpc5200: Make PSC UART driver update serial errors counters powerpc/mpc5200: Remove obsolete code from mpc5200 MDIO driver powerpc/mpc5200: Add MDMA/UDMA support to MPC5200 ATA driver ... Fix trivial conflict in drivers/char/Makefile as per Paul's directions
| * | | powerpc: Remove `have_of' global variableAnton Vorontsov2008-12-161-2/+1
| | |/ | |/| | | | | | | | | | | | | | | | | | | | | | The `have_of' variable is a relic from the arch/ppc time, it isn't useful nowadays. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 13:49:20 +0000