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* rcu: Add a TINY_PREEMPT_RCUPaul E. McKenney2010-08-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement a small-memory-footprint uniprocessor-only implementation of preemptible RCU. This implementation uses but a single blocked-tasks list rather than the combinatorial number used per leaf rcu_node by TREE_PREEMPT_RCU, which reduces memory consumption and greatly simplifies processing. This version also takes advantage of uniprocessor execution to accelerate grace periods in the case where there are no readers. The general design is otherwise broadly similar to that of TREE_PREEMPT_RCU. This implementation is a step towards having RCU implementation driven off of the SMP and PREEMPT kernel configuration variables, which can happen once this implementation has accumulated sufficient experience. Removed ACCESS_ONCE() from __rcu_read_unlock() and added barrier() as suggested by Steve Rostedt in order to avoid the compiler-reordering issue noted by Mathieu Desnoyers (http://lkml.org/lkml/2010/8/16/183). As can be seen below, CONFIG_TINY_PREEMPT_RCU represents almost 5Kbyte savings compared to CONFIG_TREE_PREEMPT_RCU. Of course, for non-real-time workloads, CONFIG_TINY_RCU is even better. CONFIG_TREE_PREEMPT_RCU text data bss dec filename 13 0 0 13 kernel/rcupdate.o 6170 825 28 7023 kernel/rcutree.o ---- 7026 Total CONFIG_TINY_PREEMPT_RCU text data bss dec filename 13 0 0 13 kernel/rcupdate.o 2081 81 8 2170 kernel/rcutiny.o ---- 2183 Total CONFIG_TINY_RCU (non-preemptible) text data bss dec filename 13 0 0 13 kernel/rcupdate.o 719 25 0 744 kernel/rcutiny.o --- 757 Total Requested-by: Loïc Minier <loic.minier@canonical.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu head remove initMathieu Desnoyers2010-08-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | RCU heads really don't need to be initialized. Their state before call_rcu() really does not matter. We need to keep init/destroy_rcu_head_on_stack() though, since we want debugobjects to be able to keep track of these objects. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> CC: David S. Miller <davem@davemloft.net> CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> CC: akpm@linux-foundation.org CC: mingo@elte.hu CC: laijs@cn.fujitsu.com CC: dipankar@in.ibm.com CC: josh@joshtriplett.org CC: dvhltc@us.ibm.com CC: niv@us.ibm.com CC: tglx@linutronix.de CC: peterz@infradead.org CC: rostedt@goodmis.org CC: Valdis.Kletnieks@vt.edu CC: dhowells@redhat.com CC: eric.dumazet@gmail.com CC: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* kernel: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | | | | This adds annotations for RCU operations in core kernel components Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* idr: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Manfred Spraul <manfred@colorfullife.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* radix-tree: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Nick Piggin <npiggin@suse.de> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* notifiers: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: improve kerneldoc for rcu_read_lock(), call_rcu(), and synchronize_rcu()Paul E. McKenney2010-08-19
| | | | | | | | | Make it explicit that new RCU read-side critical sections that start after call_rcu() and synchronize_rcu() start might still be running after the end of the relevant grace period. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* Add RCU check for find_task_by_vpid().Tetsuo Handa2010-08-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | find_task_by_vpid() says "Must be called under rcu_read_lock().". But due to commit 3120438 "rcu: Disable lockdep checking in RCU list-traversal primitives", we are currently unable to catch "find_task_by_vpid() with tasklist_lock held but RCU lock not held" errors due to the RCU-lockdep checks being suppressed in the RCU variants of the struct list_head traversals. This commit therefore places an explicit check for being in an RCU read-side critical section in find_task_by_pid_ns(). =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- kernel/pid.c:386 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 1 1 lock held by rc.sysinit/1102: #0: (tasklist_lock){.+.+..}, at: [<c1048340>] sys_setpgid+0x40/0x160 stack backtrace: Pid: 1102, comm: rc.sysinit Not tainted 2.6.35-rc3-dirty #1 Call Trace: [<c105e714>] lockdep_rcu_dereference+0x94/0xb0 [<c104b4cd>] find_task_by_pid_ns+0x6d/0x70 [<c104b4e8>] find_task_by_vpid+0x18/0x20 [<c1048347>] sys_setpgid+0x47/0x160 [<c1002b50>] sysenter_do_call+0x12/0x36 Commit updated to use a new rcu_lockdep_assert() exported API rather than the old internal __do_rcu_dereference(). Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* kvm: add __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* net/netfilter: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Patrick McHardy <kaber@trash.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* input: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* nfs: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* keys: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David Howells <dhowells@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* credentials: rcu annotationArnd Bergmann2010-08-19
| | | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* cgroups: __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rculist: avoid __rcu annotationsArnd Bergmann2010-08-19
| | | | | | | | | | | | | | | | This avoids warnings from missing __rcu annotations in the rculist implementation, making it possible to use the same lists in both RCU and non-RCU cases. We can add rculist annotations later, together with lockdep support for rculist, which is missing as well, but that may involve changing all the users. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: define __rcu address space modifier for sparsePaul E. McKenney2010-08-19
| | | | | | | | | | | | | | | | | | | | | | | | This commit provides definitions for the __rcu annotation defined earlier. This annotation permits sparse to check for correct use of RCU-protected pointers. If a pointer that is annotated with __rcu is accessed directly (as opposed to via rcu_dereference(), rcu_assign_pointer(), or one of their variants), sparse can be made to complain. To enable such complaints, use the new default-disabled CONFIG_SPARSE_RCU_POINTER kernel configuration option. Please note that these sparse complaints are intended to be a debugging aid, -not- a code-style-enforcement mechanism. There are special rcu_dereference_protected() and rcu_access_pointer() accessors for use when RCU read-side protection is not required, for example, when no other CPU has access to the data structure in question or while the current CPU hold the update-side lock. This patch also updates a number of docbook comments that were showing their age. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Christopher Li <sparse@chrisli.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* net: convert to rcu_dereference_index_check()Paul E. McKenney2010-08-19
| | | | | | | | | | | | The task_cls_classid() function applies rcu_dereference() to integers, which does not work with the shiny new sparse-based checking in rcu_dereference(). This commit therefore moves to the new RCU API rcu_dereference_index_check(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
* Fix the declaration of sys_execve() in asm-generic/syscalls.hDavid Howells2010-08-18
| | | | | | | | Fix the declaration of sys_execve() in asm-generic/syscalls.h to have various consts applied to its pointers. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2010-08-18
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: fs: brlock vfsmount_lock fs: scale files_lock lglock: introduce special lglock and brlock spin locks tty: fix fu_list abuse fs: cleanup files_lock locking fs: remove extra lookup in __lookup_hash fs: fs_struct rwlock to spinlock apparmor: use task path helpers fs: dentry allocation consolidation fs: fix do_lookup false negative mbcache: Limit the maximum number of cache entries hostfs ->follow_link() braino hostfs: dumb (and usually harmless) tpyo - strncpy instead of strlcpy remove SWRITE* I/O types kill BH_Ordered flag vfs: update ctime when changing the file's permission by setfacl cramfs: only unlock new inodes fix reiserfs_evict_inode end_writeback second call
| * fs: scale files_lockNick Piggin2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fs: scale files_lock Improve scalability of files_lock by adding per-cpu, per-sb files lists, protected with an lglock. The lglock provides fast access to the per-cpu lists to add and remove files. It also provides a snapshot of all the per-cpu lists (although this is very slow). One difficulty with this approach is that a file can be removed from the list by another CPU. We must track which per-cpu list the file is on with a new variale in the file struct (packed into a hole on 64-bit archs). Scalability could suffer if files are frequently removed from different cpu's list. However loads with frequent removal of files imply short interval between adding and removing the files, and the scheduler attempts to avoid moving processes too far away. Also, even in the case of cross-CPU removal, the hardware has much more opportunity to parallelise cacheline transfers with N cachelines than with 1. A worst-case test of 1 CPU allocating files subsequently being freed by N CPUs degenerates to contending on a single lock, which is no worse than before. When more than one CPU are allocating files, even if they are always freed by different CPUs, there will be more parallelism than the single-lock case. Testing results: On a 2 socket, 8 core opteron, I measure the number of times the lock is taken to remove the file, the number of times it is removed by the same CPU that added it, and the number of times it is removed by the same node that added it. Booting: locks= 25049 cpu-hits= 23174 (92.5%) node-hits= 23945 (95.6%) kbuild -j16 locks=2281913 cpu-hits=2208126 (96.8%) node-hits=2252674 (98.7%) dbench 64 locks=4306582 cpu-hits=4287247 (99.6%) node-hits=4299527 (99.8%) So a file is removed from the same CPU it was added by over 90% of the time. It remains within the same node 95% of the time. Tim Chen ran some numbers for a 64 thread Nehalem system performing a compile. throughput 2.6.34-rc2 24.5 +patch 24.9 us sys idle IO wait (in %) 2.6.34-rc2 51.25 28.25 17.25 3.25 +patch 53.75 18.5 19 8.75 So significantly less CPU time spent in kernel code, higher idle time and slightly higher throughput. Single threaded performance difference was within the noise of microbenchmarks. That is not to say penalty does not exist, the code is larger and more memory accesses required so it will be slightly slower. Cc: linux-kernel@vger.kernel.org Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * lglock: introduce special lglock and brlock spin locksNick Piggin2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | lglock: introduce special lglock and brlock spin locks This patch introduces "local-global" locks (lglocks). These can be used to: - Provide fast exclusive access to per-CPU data, with exclusive access to another CPU's data allowed but possibly subject to contention, and to provide very slow exclusive access to all per-CPU data. - Or to provide very fast and scalable read serialisation, and to provide very slow exclusive serialisation of data (not necessarily per-CPU data). Brlocks are also implemented as a short-hand notation for the latter use case. Thanks to Paul for local/global naming convention. Cc: linux-kernel@vger.kernel.org Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * tty: fix fu_list abuseNick Piggin2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | tty: fix fu_list abuse tty code abuses fu_list, which causes a bug in remount,ro handling. If a tty device node is opened on a filesystem, then the last link to the inode removed, the filesystem will be allowed to be remounted readonly. This is because fs_may_remount_ro does not find the 0 link tty inode on the file sb list (because the tty code incorrectly removed it to use for its own purpose). This can result in a filesystem with errors after it is marked "clean". Taking idea from Christoph's initial patch, allocate a tty private struct at file->private_data and put our required list fields in there, linking file and tty. This makes tty nodes behave the same way as other device nodes and avoid meddling with the vfs, and avoids this bug. The error handling is not trivial in the tty code, so for this bugfix, I take the simple approach of using __GFP_NOFAIL and don't worry about memory errors. This is not a problem because our allocator doesn't fail small allocs as a rule anyway. So proper error handling is left as an exercise for tty hackers. [ Arguably filesystem's device inode would ideally be divorced from the driver's pseudo inode when it is opened, but in practice it's not clear whether that will ever be worth implementing. ] Cc: linux-kernel@vger.kernel.org Cc: Christoph Hellwig <hch@infradead.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fs: cleanup files_lock lockingNick Piggin2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fs: cleanup files_lock locking Lock tty_files with a new spinlock, tty_files_lock; provide helpers to manipulate the per-sb files list; unexport the files_lock spinlock. Cc: linux-kernel@vger.kernel.org Cc: Christoph Hellwig <hch@infradead.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fs: fs_struct rwlock to spinlockNick Piggin2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fs: fs_struct rwlock to spinlock struct fs_struct.lock is an rwlock with the read-side used to protect root and pwd members while taking references to them. Taking a reference to a path typically requires just 2 atomic ops, so the critical section is very small. Parallel read-side operations would have cacheline contention on the lock, the dentry, and the vfsmount cachelines, so the rwlock is unlikely to ever give a real parallelism increase. Replace it with a spinlock to avoid one or two atomic operations in typical path lookup fastpath. Signed-off-by: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * remove SWRITE* I/O typesChristoph Hellwig2010-08-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These flags aren't real I/O types, but tell ll_rw_block to always lock the buffer instead of giving up on a failed trylock. Instead add a new write_dirty_buffer helper that implements this semantic and use it from the existing SWRITE* callers. Note that the ll_rw_block code had a bug where it didn't promote WRITE_SYNC_PLUG properly, which this patch fixes. In the ufs code clean up the helper that used to call ll_rw_block to mirror sync_dirty_buffer, which is the function it implements for compound buffers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * kill BH_Ordered flagChristoph Hellwig2010-08-18
| | | | | | | | | | | | | | | | | | Instead of abusing a buffer_head flag just add a variant of sync_dirty_buffer which allows passing the exact type of write flag required. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'for-linus' of ↵Linus Torvalds2010-08-18
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: ALSA: emu10k1 - delay the PCM interrupts (add pcm_irq_delay parameter) ALSA: hda - Fix ALC680 base model capture ASoC: Remove DSP mode support for WM8776 ALSA: hda - Add quirk for Dell Vostro 1220 ALSA: riptide - Fix detection / load of firmware files
| * | ALSA: emu10k1 - delay the PCM interrupts (add pcm_irq_delay parameter)Jaroslav Kysela2010-08-18
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With some hardware combinations, the PCM interrupts are acknowledged before the period boundary from the emu10k1 chip. The midlevel PCM code gets confused and the playback stream is interrupted. It seems that the interrupt processing shift by 2 samples is enough to fix this issue. This default value does not harm other, non-affected hardware. More information: Kernel bugzilla bug#16300 [A copmile warning fixed by tiwai] Signed-off-by: Jaroslav Kysela <perex@perex.cz> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* | Merge branch 'merge-devicetree' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds2010-08-18
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'merge-devicetree' of git://git.secretlab.ca/git/linux-2.6: spi.h: missing kernel-doc notation, please fix of: fix missing headers for of_address_to_resource() in MTD and SysACE drivers of: Fix missing includes ata: update for of_device to platform_device replacement microblaze: Fix of: eliminate of_device->node and dev_archdata->{of,prom}_node microblaze: Fix of/address: Merge all of the bus translation code booting-without-of: Remove nonexistent chapters from TOC, fix numbering
| * | spi.h: missing kernel-doc notation, please fixErnst Schwab2010-08-18
| |/ | | | | | | | | | | | | | | Added comments in kernel-doc notation for previously added struct fields. Signed-off-by: Ernst Schwab <eschwab@online.de> Acked-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* | Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2010-08-17
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | * master.kernel.org:/home/rmk/linux-2.6-arm: VIDEO: amba clcd: don't disable an already disabled clock ARM: Tighten check for allowable CPSR values ARM: 6329/1: wire up sys_accept4() on ARM ARM: 6328/1: Build with -fno-dwarf2-cfi-asm ARM: 6326/1: kgdb: fix GDB_MAX_REGS no longer used
| * | VIDEO: amba clcd: don't disable an already disabled clockRussell King2010-08-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the clock enable/disable tracking in the AMBA CLCD driver so that the driver doesn't try to disable an already disabled clock, thereby causing the clock (if shared) to become unbalanced. This resolves a problem with CLCD on LPC32xx ARM platforms. Reported-by: Kevin Wells <wellsk40@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | | Make do_execve() take a const filename pointerDavid Howells2010-08-17
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make do_execve() take a const filename pointer so that kernel_execve() compiles correctly on ARM: arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type This also requires the argv and envp arguments to be consted twice, once for the pointer array and once for the strings the array points to. This is because do_execve() passes a pointer to the filename (now const) to copy_strings_kernel(). A simpler alternative would be to cast the filename pointer in do_execve() when it's passed to copy_strings_kernel(). do_execve() may not change any of the strings it is passed as part of the argv or envp lists as they are some of them in .rodata, so marking these strings as const should be fine. Further kernel_execve() and sys_execve() need to be changed to match. This has been test built on x86_64, frv, arm and mips. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge branch 'release' of ↵Linus Torvalds2010-08-15
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: gcc-4.6: ACPI: fix unused but set variables in ACPI ACPI thermal: make procfs I/F depend on CONFIG_ACPI_PROCFS ACPI video: make procfs I/F depend on CONFIG_ACPI_PROCFS ACPI processor: remove deprecated ACPI procfs I/F ACPI power_resource: remove unused procfs I/F ACPI: remove deprecated ACPI procfs I/F ACPI: introduce drivers/acpi/sysfs.c ACPI: introduce module parameter acpi.aml_debug_output ACPI: introduce drivers/acpi/debugfs.c ACPI, APEI, ERST debug support ACPI, APEI, Manage GHES as platform devices ACPI, APEI, Rename CPER and GHES severity constants ACPI, APEI, Fix a typo of error path of apei_resources_request ACPI / ACPICA: Fix reference counting problems with GPE handlers ACPI: Add the check of ADR flag in course of finding ACPI handle for PCI device ACPI / Sleep: Drop acpi_suspend_finish() ACPI / Sleep: Consolidate suspend and hibernation routines ACPI / Wakeup: Simplify enabling of wakeup devices ACPI / Sleep: Rework enabling wakeup devices ACPI / Sleep: Free NVS copy if suspending of devices fails Fixed up totally buggered "ACPI: fix unused but set variables in ACPI" patch that doesn't even compile in the merge. Thanks to Sedat Dilek <sedat.dilek@googlemail.com> for noticing the breakage before I even pulled. And a big "Grrr.." at Len for not even bothering to compile the tree before asking me to pull.
| * | Merge branch 'linus' into releaseLen Brown2010-08-15
| |\| | | | | | | | | | | | | | | | | | | Conflicts: drivers/acpi/debug.c Signed-off-by: Len Brown <len.brown@intel.com>
| * | ACPI processor: remove deprecated ACPI procfs I/FZhang Rui2010-08-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove deprecated ACPI processor procfs I/F, including: /proc/acpi/processor/CPUX/power /proc/acpi/processor/CPUX/limit /proc/acpi/processor/CPUX/info /proc/acpi/processor/CPUX/throttling still exists, as we don't have sysfs I/F available for now. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | Merge branch 'acpica-gpe' into releaseLen Brown2010-08-15
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| * \ \ Merge branch 'procfs-cleanup' into releaseLen Brown2010-08-14
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| | * | | ACPI: introduce module parameter acpi.aml_debug_outputZhang Rui2010-08-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce module parameter acpi.aml_debug_output. With acpi.aml_debug_output set, we can get AML debug object output (Store (AAA, Debug)), even with CONFIG_ACPI_DEBUG cleared. Together with the runtime custom method mechanism, we can debug AML code problems without rebuilding the kernel. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
| * | | | ACPI, APEI, Rename CPER and GHES severity constantsHuang Ying2010-08-08
| |/ / / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The abbreviation of severity should be SEV instead of SER, so the CPER severity constants are renamed accordingly. GHES severity constants are renamed in the same way too. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
* | | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tileLinus Torvalds2010-08-15
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: arch/tile: don't validate CROSS_COMPILE needlessly arch/tile: export only COMMAND_LINE_SIZE to userspace. arch/tile: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN arch/tile: Rename the hweight() implementations to __arch_hweight() arch/tile: extend syscall ABI to set r1 on return as well. arch/tile: Various cleanups. arch/tile: support backtracing on TILE-Gx arch/tile: Fix a couple of issues with the COMPAT code for TILE-Gx. arch/tile: Use separate, better minsec values for clocksource and sched_clock. arch/tile: correct a bug in freeing bootmem by VA for the optional second initrd. arch: tile: mm: pgtable.c: Removed duplicated #include arch: tile: kernel/proc.c Removed duplicated #include Add fanotify syscalls to <asm-generic/unistd.h>. arch/tile: support new kunmap_atomic() naming convention. tile: remove unused ISA_DMA_THRESHOLD define Conflicts in arch/tile/configs/tile_defconfig (pick the mainline version with the reduced defconfig).
| * \ \ \ Merge branch 'master' into for-linusChris Metcalf2010-08-13
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| * | | | | Add fanotify syscalls to <asm-generic/unistd.h>.Chris Metcalf2010-08-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Eric Paris <eparis@redhat.com>
* | | | | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/cleanupLinus Torvalds2010-08-14
|\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/sam/cleanup: defconfig reduction kbuild: drop unifdef-y support archs: replace unifdef-y with header-y include: replace unifdef-y with header-y
| * | | | | | include: replace unifdef-y with header-ySam Ravnborg2010-08-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | unifdef-y and header-y has same semantic. So there is no need to have both. Drop the unifdef-y variant and sort all lines again Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* | | | | | | Merge branch 'hwmon-for-linus' of ↵Linus Torvalds2010-08-14
|\ \ \ \ \ \ \ | |/ / / / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging * 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: (22 commits) hwmon: (via-cputemp) Remove bogus "SHOW" global variable hwmon: jc42 depends on I2C hwmon: (pc87427) Add a maintainer hwmon: (pc87427) Move sysfs file removal to a separate function hwmon: (pc87427) Add temperature monitoring support hwmon: (pc87427) Add support for the second logical device hwmon: (pc87427) Add support for manual fan speed control hwmon: (pc87427) Minor style cleanups hwmon: (pc87427) Handle disabled fan inputs properly hwmon: (w83627ehf) Add support for W83667HG-B hwmon: (w83627ehf) Driver cleanup hwmon: Add driver for SMSC EMC2103 temperature monitor and fan controller hwmon: Remove in[0-*]_fault from sysfs-interface hwmon: Add 4 current alarm/beep attributes to sysfs-interface hwmon: Add 3 critical limit attributes to sysfs-interface hwmon: (asc7621) Clean up and improve detect function hwmon: (it87) Export labels for internal sensors hwmon: (lm75) Add suspend/resume feature hwmon: (emc1403) Add power support hwmon: (ltc4245) Expose all GPIO pins as analog voltages ...
| * | | | | | hwmon: (ltc4245) Expose all GPIO pins as analog voltagesIra W. Snyder2010-08-14
| | |_|_|_|/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for exposing all GPIO pins as analog voltages. Though this is not an ideal use of the chip, some hardware engineers may decide that the LTC4245 meets their design requirements when studying the datasheet. The GPIO pins are sampled in round-robin fashion, meaning that a slow reader will see stale data. A userspace application can detect this, because it will get -EAGAIN when reading from a sysfs file which contains stale data. Users can choose to use this feature on a per-chip basis by using either platform data or the OF device tree (where applicable). Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* | | | | | Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds2010-08-14
|\ \ \ \ \ \ | |/ / / / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'next-spi' of git://git.secretlab.ca/git/linux-2.6: spi/amba_pl022: Fix probe and remove hook section annotations. spi/mpc5121: change annotations for probe and remove functions spi/bitbang: reinitialize transfer parameters for every message spi/spi-gpio: add support for controllers without MISO or MOSI pin spi/bitbang: add support for SPI_MASTER_NO_{TX, RX} modes SPI100k: Fix 8-bit and RX-only transfers spi/mmc_spi: mmc_spi adaptations for SPI bus locking API spi/mmc_spi: SPI bus locking API, using mutex Fix trivial conflict in drivers/spi/mpc512x_psc_spi.c due to 'struct of_device' => 'struct platform_device' rename and __init/__exit to __devinit/__devexit fix.
| * | | | | Merge commit 'v2.6.35-rc6' into spi/testGrant Likely2010-07-25
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