- 25 8月, 2010 1 次提交
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由 Luck, Tony 提交于
pa-risc and ia64 have stacks that grow upwards. Check that they do not run into other mappings. By making VM_GROWSUP 0x0 on architectures that do not ever use it, we can avoid some unpleasant #ifdefs in check_stack_guard_page(). Signed-off-by: NTony Luck <tony.luck@intel.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 24 8月, 2010 2 次提交
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由 Randy Dunlap 提交于
Warning(include/linux/usb/composite.h:284): No description found for parameter 'disconnect' Warning(drivers/usb/gadget/composite.c:744): No description found for parameter 'c' Warning(drivers/usb/gadget/composite.c:744): Excess function parameter 'cdev' description in 'usb_string_ids_n' Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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由 David Howells 提交于
Break the kobject namespace defs into their own header to avoid a header file inclusion ordering problem between linux/sysfs.h and linux/kobject.h. This fixes the build breakage on older versions of gcc. Signed-off-by: NDavid Howells <dhowells@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 23 8月, 2010 4 次提交
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由 Ian Campbell 提交于
by defining in terms of (1<<N). XEN_UNPLUG_UNNECESSARY and XEN_UNPLUG_NEVER are only used within the kernel and are not defined as a bit on the unplug IO port. Therefore use a bit which is outside the potentially valid range of the 16 bit IO port. Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Acked-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: NStefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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由 Ian Campbell 提交于
It is not immediately clear what this option causes to become ignored. The actual meaning is that it is not necessary to unplug the emulated devices to safely use the PV ones, even if the platform does not support the unplug protocol. (pressumably the user will only add this option if they have ensured that their domain configuration is safe). I think xen_emul_unplug=unnecessary better captures this. Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Acked-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: NStefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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由 Ian Campbell 提交于
this allows the user to disable pvhvm and revert to emulated devices in case of a system misconfiguration (e.g. initramfs with only emulated drivers in it). Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Acked-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: NStefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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由 Changli Gao 提交于
__packed is only defined in kernel space, so we should use __attribute__((packed)) for the code shared between kernel and user space. Two __attribute() annotations are replaced with __attribute__() too. Signed-off-by: NChangli Gao <xiaosuo@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 22 8月, 2010 1 次提交
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由 Arjan van de Ven 提交于
With the introduction of the new unified work queue thread pools, we lost one feature: It's no longer possible to know which worker is causing the CPU to wake out of idle. The result is that PowerTOP now reports a lot of "kworker/a:b" instead of more readable results. This patch adds a pair of tracepoints to the new workqueue code, similar in style to the timer/hrtimer tracepoints. With this pair of tracepoints, the next PowerTOP can correctly report which work item caused the wakeup (and how long it took): Interrupt (43) i915 time 3.51ms wakeups 141 Work ieee80211_iface_work time 0.81ms wakeups 29 Work do_dbs_timer time 0.55ms wakeups 24 Process Xorg time 21.36ms wakeups 4 Timer sched_rt_period_timer time 0.01ms wakeups 1 Signed-off-by: NArjan van de Ven <arjan@linux.intel.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 21 8月, 2010 5 次提交
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由 Linus Torvalds 提交于
It's a really simple list, and several of the users want to go backwards in it to find the previous vma. So rather than have to look up the previous entry with 'find_vma_prev()' or something similar, just make it doubly linked instead. Tested-by: NIan Campbell <ijc@hellion.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Kay Sievers 提交于
Recent modprobe and udev versions allow to create device nodes for modules which are not loaded. Only the first access will cause the in-kernel module loader to pull-in the module. Systems which never access the device node will not needlessly load the module, and no longer need init scripts or other facilities to unconditionally load it. Signed-off-by: NKay Sievers <kay.sievers@vrfy.org> Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
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由 Dmitry Torokhov 提交于
Since handle_sysrq() does not take tty as argument anymore we can drop it from usb_serial_handle_sysrq_char() as well. Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: NJason Wessel <jason.wessel@windriver.com> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
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由 Dmitry Torokhov 提交于
Sysrq operations do not accept tty argument anymore so no need to pass it to us. [Stephen Rothwell <sfr@canb.auug.org.au>: fix build breakage in drm code caused by sysrq using bool but not including linux/types.h] [Sachin Sant <sachinp@in.ibm.com>: fix build breakage in s390 keyboadr driver] Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: NJason Wessel <jason.wessel@windriver.com> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
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由 Andrea Righi 提交于
kfifo_skip() is currently broken, due to the missing of the internal helper function. Add it. Signed-off-by: NAndrea Righi <arighi@develer.com> Cc: Greg KH <greg@kroah.com> Acked-by: NStefani Seibold <stefani@seibold.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 8月, 2010 1 次提交
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由 Dmitry Torokhov 提交于
Noone is using tty argument so let's get rid of it. Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk> Acked-by: NJason Wessel <jason.wessel@windriver.com> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NDmitry Torokhov <dtor@mail.ru>
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- 19 8月, 2010 4 次提交
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由 Arjan van de Ven 提交于
PowerTOP would like to be able to trace timers. Unfortunately, the current timer tracing is not very useful: the actual timer function is not recorded in the trace at the start of timer execution. Although this is recorded for timer "start" time (when it gets armed), this is not useful; most timers get started early, and a tracer like PowerTOP will never see this event, but will only see the actual running of the timer. This patch just adds the function to the timer tracing; I've verified with PowerTOP that now it can get useful information about timers. Signed-off-by: NArjan van de Ven <arjan@linux.intel.com> Cc: xiaoguangrong@cn.fujitsu.com Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@kernel.org> # .35.x, .34.x, .33.x LKML-Reference: <4C6C5FA9.3000405@linux.intel.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Sam Ravnborg 提交于
"make headers_check" issued the following warning: CHECK include/linux/netfilter (64 files) usr/include/linux/netfilter/xt_ipvs.h:19: found __[us]{8,16,32,64} type without #include <linux/types.h> Fix this by as suggested including linux/types.h. Signed-off-by: NSam Ravnborg <sam@ravnborg.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Sachin Sanap 提交于
Signed-off-by: NSachin Sanap <ssanap@marvell.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 David Howells 提交于
Fix the declaration of sys_execve() in asm-generic/syscalls.h to have various consts applied to its pointers. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 18 8月, 2010 11 次提交
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由 Jaroslav Kysela 提交于
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: NJaroslav Kysela <perex@perex.cz> Cc: <stable@kernel.org> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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由 Nick Piggin 提交于
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: NNick Piggin <npiggin@kernel.dk> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Nick Piggin 提交于
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: NNick Piggin <npiggin@kernel.dk> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Nick Piggin 提交于
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: NNick Piggin <npiggin@kernel.dk> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Nick Piggin 提交于
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: NAndi Kleen <ak@linux.intel.com> Acked-by: NGreg Kroah-Hartman <gregkh@suse.de> Signed-off-by: NNick Piggin <npiggin@kernel.dk> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Nick Piggin 提交于
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: NNick Piggin <npiggin@kernel.dk> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Christoph Hellwig 提交于
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: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Christoph Hellwig 提交于
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: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Ernst Schwab 提交于
Added comments in kernel-doc notation for previously added struct fields. Signed-off-by: NErnst Schwab <eschwab@online.de> Acked-by: NRandy Dunlap <rdunlap@xenotime.net> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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由 David Howells 提交于
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: NDavid Howells <dhowells@redhat.com> Tested-by: NRalf Baechle <ralf@linux-mips.org> Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Russell King 提交于
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: NKevin Wells <wellsk40@gmail.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 17 8月, 2010 1 次提交
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由 Dave Airlie 提交于
With the current screwed but its ABI, ioctls for the drm, Linus pointed out that we could allow userspace to specify the allocation size, but we pass it to the driver which then uses it blindly to store a struct. Now if userspace specifies the allocation size as smaller than the driver needs, the driver can possibly overwrite memory. This patch restructures the driver ioctls so we store the structure size we are expecting, and make sure we allocate at least that size. The copy from/to userspace are still restricted to the size the user specifies, this allows ioctl structs to grow on both sides of the equation. Up until now we didn't really use the DRM_IOCTL defines in the kernel, so this cleans them up and adds them for nouveau. v2: fix nouveau pushbuf arg (thanks to Ben for pointing it out) Reported-by: NLinus Torvalds <torvalds@linuxfoundation.org> Signed-off-by: NDave Airlie <airlied@redhat.com>
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- 15 8月, 2010 4 次提交
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由 Zhang Rui 提交于
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: NZhang Rui <rui.zhang@intel.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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由 Zhang Rui 提交于
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: NZhang Rui <rui.zhang@intel.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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由 Sam Ravnborg 提交于
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: NSam Ravnborg <sam@ravnborg.org>
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由 Ira W. Snyder 提交于
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: NIra W. Snyder <iws@ovro.caltech.edu> Signed-off-by: NJean Delvare <khali@linux-fr.org>
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- 14 8月, 2010 3 次提交
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由 David Howells 提交于
Mark arguments to certain system calls as being const where they should be but aren't. The list includes: (*) The filename arguments of various stat syscalls, execve(), various utimes syscalls and some mount syscalls. (*) The filename arguments of some syscall helpers relating to the above. (*) The buffer argument of various write syscalls. Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Arnd Bergmann 提交于
The last user is gone, so we can safely remove this Signed-off-by: NArnd Bergmann <arnd@arndb.de> Cc: John Kacur <jkacur@redhat.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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由 Heiko Carstens 提交于
commit 4565f017 "dma-mapping: unify dma_get_cache_alignment implementations" causes build errors on !HAS_DMA architectures/platforms like s390 and sun3: include/linux/dma-mapping.h:145: error: static declaration of 'dma_get_cache_alignment' follows non-static declaration include/asm-generic/dma-mapping-broken.h:73: error: previous declaration of 'dma_get_cache_alignment' was here Fix this by adding an explicit ifdef. Cc: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 13 8月, 2010 3 次提交
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由 Chris Metcalf 提交于
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Acked-by: NArnd Bergmann <arnd@arndb.de> Cc: Eric Paris <eparis@redhat.com>
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由 Linus Torvalds 提交于
This reverts commit 3bcf3860 (and the accompanying commit c1e5c954 "vfs/fsnotify: fsnotify_close can delay the final work in fput" that was a horribly ugly hack to make it work at all). The 'struct file' approach not only causes that disgusting hack, it somehow breaks pulseaudio, probably due to some other subtlety with f_count handling. Fix up various conflicts due to later fsnotify work. Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Chris Wilson 提交于
The current computation, introduced with f12a15be, of FSEC_PER_SEC using the multiplication of (FSEC_PER_NSEC * NSEC_PER_SEC) is performed only with 32bit integers on small machines, resulting in an overflow and a *very* short intervals being programmed. An interrupt storm follows. Note that we also have to specify FSEC_PER_SEC as being long long to overcome the same limitations. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NJohn Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: NIngo Molnar <mingo@elte.hu> Acked-by: NH. Peter Anvin <hpa@zytor.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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