- 12 Nov, 2010 33 commits
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Edgar (gimli) Hucek authored
Add support for the MacBookAir3,1 and MacBookAir3,2 to the mbp-nvidia-bl driver. Signed-off-by:
Edgar (gimli) Hucek <gimli@dark-green.com> Acked-by:
Richard Purdie <rpurdie@linux.intel.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Michael Hennerich authored
Handle return value, strict_strtoul is declared with attribute warn_unused_result. Signed-off-by:
Michael Hennerich <michael.hennerich@analog.com> Cc: Mike Frysinger <vapier@gentoo.org> Acked-by:
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Michael Hennerich authored
This affects the get/set of the current Ambient Light Zone. Reading should return an integer between 1..3 (1 = Daylight, 2 = office, 3 = dark). Writing a value between 1..3 forces the backlight controller to enter the corresponding Ambient Light Zone. Writing 0 returns to normal operation. Fix valid range checking so we don't write invalid values to the controller, and make sure we subtract 1, since this is what the register definition (CFGR:BLV) requires. Otherwise the values written don't work correctly. Signed-off-by:
Mike Frysinger <vapier@gentoo.org> Acked-by:
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Arun Murthy authored
The intensity of the backlight can be varied from a range of max_brightness to zero. Though most, if not all the pwm based backlight devices start flickering at lower brightness value. And also for each device there exists a brightness value below which the backlight appears to be turned off though the value is not equal to zero. If the range of brightness for a device is from zero to max_brightness. A graph is plotted for brightness Vs intensity for the pwm based backlight device has to be a linear graph. intensity | / | / | / |/ --------- 0 max_brightness But pratically on measuring the above we note that the intensity of backlight goes to zero(OFF) when the value in not zero almost nearing to zero(some x%). so the graph looks like intensity | / | / | / | | ------------ 0 x max_brightness In order to overcome this drawback knowing this x% i.e nothing but the low threshold beyond which the backlight is off and will have no effect, the brightness value is being offset by the low threshold value(retaining the linearity of the graph). Now the graph becomes intensity | / | / | / | / ------------- 0 max_brightness With this for each and every digit increment in the brightness from zero there is a change in the intensity of backlight. Devices having this behaviour can set the low threshold brightness(lth_brightness) and pass the same as platform data else can have it as zero. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Arun Murthy <arun.murthy@stericsson.com> Acked-by:
Linus Walleij <linus.walleij@stericsson.com> Acked-by:
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Axel Lin authored
Eliminate section mismatch warning by marking s6e63m0_probe() as __devinit. Signed-off-by:
Axel Lin <axel.lin@gmail.com> Acked-by:
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Axel Lin authored
drivers/video/backlight/s6e63m0.c: unregister backlight device and remove sysfs attribute file in s6e63m0_remove s6e63m0_probe() registered backlight device and create sysfs attribute files, thus s6e63m0_remove() should unregister backlight device and remove sysfs attribute files. Signed-off-by:
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Marek Vasut authored
The LCD was turned on if the variable power was > 0, but that was incorrect. The LCD has to be turned on in NORMAL and UNBLANK case. Signed-off-by:
Marek Vasut <marek.vasut@gmail.com> Acked-by:
Richard Purdie <rpurdie@rpsys.net> Signed-off-by:
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Marek Vasut authored
The LCD was turned on if the variable power was > 0, but that was incorrect. The LCD has to be turned on in NORMAL and UNBLANK case. Signed-off-by:
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Axel Lin authored
gamma_table is not writable, so set permissions to 0444. Signed-off-by:
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Davidlohr Bueso authored
In the event that none of the configs are set (CONFIG_LEDS_GPIO_PLATFORM, CONFIG_LEDS_GPIO_OF, CONFIG_LEDS_GPIO_PLATFORM), we will return a bogus value when initializing the module. Signed-off-by:
Davidlohr Bueso <dave@gnu.org> Acked-by:
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Samu Onkalo authored
Create sub directory Documentation/leds and add short documentation for LP5521 and LP5523 drivers. Signed-off-by:
Samu Onkalo <samu.p.onkalo@nokia.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by:
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Samu Onkalo authored
Provide configuration and compilation support for LP5521 and LP5523 Signed-off-by:
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Samu Onkalo authored
LP5523 chip is nine channel led driver with programmable engines. Driver provides support for that chip for direct access via led class or via programmable engines. Signed-off-by:
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Samu Onkalo authored
This patchset provides support for LP5521 and LP5523 LED driver chips from National Semicondutor. Both drivers supports programmable engines and naturally LED class features. Documentation is provided as a part of the patchset. I created "leds" subdirectory under Documentation. Perhaps the rest of the leds* documentation should be moved there. Datasheets are freely available at National Semiconductor www pages. This patch: LP5521 chip is three channel led driver with programmable engines. Driver provides support for that chip for direct access via led class or via programmable engines. Signed-off-by:
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Johannes Berg authored
Currently, blinking LEDs can be awkward because it is not guaranteed that all LEDs implement blinking. The trigger that wants it to blink then needs to implement its own timer solution. Rather than require that, add led_blink_set() API that triggers can use. This function will attempt to use hw blinking, but if that fails implements a timer for it. To stop blinking again, brightness_set() also needs to be wrapped into API that will stop the software blink. As a result of this, the timer trigger becomes a very trivial one, and hopefully we can finally see triggers using blinking as well because it's always easy to use. Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Acked-by:
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Dave Jones authored
WARN_ONCE is a bit strong for a deprecation warning, given that it spews a huge backtrace. Signed-off-by:
Dave Jones <davej@redhat.com> Signed-off-by:
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Nick Piggin authored
Salman Qazi describes the following radix-tree bug: In the following case, we get can get a deadlock: 0. The radix tree contains two items, one has the index 0. 1. The reader (in this case find_get_pages) takes the rcu_read_lock. 2. The reader acquires slot(s) for item(s) including the index 0 item. 3. The non-zero index item is deleted, and as a consequence the other item is moved to the root of the tree. The place where it used to be is queued for deletion after the readers finish. 3b. The zero item is deleted, removing it from the direct slot, it remains in the rcu-delayed indirect node. 4. The reader looks at the index 0 slot, and finds that the page has 0 ref count 5. The reader looks at it again, hoping that the item will either be freed or the ref count will increase. This never happens, as the slot it is looking at will never be updated. Also, this slot can never be reclaimed because the reader is holding rcu_read_lock and is in an infinite loop. The fix is to re-use the same "indirect" pointer case that requires a slot lookup retry into a general "retry the lookup" bit. Signed-off-by:Nick Piggin <npiggin@kernel.dk> Reported-by:
Salman Qazi <sqazi@google.com> Cc: <stable@kernel.org> Signed-off-by:
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Dan Rosenberg authored
The kernel syslog contains debugging information that is often useful during exploitation of other vulnerabilities, such as kernel heap addresses. Rather than futilely attempt to sanitize hundreds (or thousands) of printk statements and simultaneously cripple useful debugging functionality, it is far simpler to create an option that prevents unprivileged users from reading the syslog. This patch, loosely based on grsecurity's GRKERNSEC_DMESG, creates the dmesg_restrict sysctl. When set to "0", the default, no restrictions are enforced. When set to "1", only users with CAP_SYS_ADMIN can read the kernel syslog via dmesg(8) or other mechanisms. [akpm@linux-foundation.org: explain the config option in kernel.txt] Signed-off-by:
Dan Rosenberg <drosenberg@vsecurity.com> Acked-by:
Ingo Molnar <mingo@elte.hu> Acked-by:
Eugene Teo <eugeneteo@kernel.org> Acked-by:
Kees Cook <kees.cook@canonical.com> Signed-off-by:
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David Rientjes authored
/proc/pid/oom_adj was deprecated in August 2010 with the introduction of the new oom killer heuristic. This patch copies the Documentation/feature-removal-schedule.txt entry for this tunable to the Documentation/ABI/obsolete directory so nobody misses it. Signed-off-by:
David Rientjes <rientjes@google.com> Reported-by:
Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Shaohua Li authored
nr_dirty and nr_congested are increased only when the page is dirty. So if all pages are clean, both them will be zero. In this case, we should not mark the zone congested. Signed-off-by:
Shaohua Li <shaohua.li@intel.com> Reviewed-by:
Johannes Weiner <hannes@cmpxchg.org> Reviewed-by:
Minchan Kim <minchan.kim@gmail.com> Acked-by:
Mel Gorman <mel@csn.ul.ie> Signed-off-by:
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Ken Chen authored
Per task latencytop accumulator prematurely terminates due to erroneous placement of latency_record_count. It should be incremented whenever a new record is allocated instead of increment on every latencytop event. Also fix search iterator to only search known record events instead of blindly searching all pre-allocated space. Signed-off-by:
Ken Chen <kenchen@google.com> Reviewed-by:
Arjan van de Ven <arjan@infradead.org> Cc: <stable@kernel.org> Signed-off-by:
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Dave Hansen authored
70 hours into some stress tests of a 2.6.32-based enterprise kernel, we ran into a NULL dereference in here: int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc, unsigned long from) { ----> struct inode *inode = page->mapping->host; It looks like page->mapping was the culprit. (xmon trace is below). After closer examination, I realized that do_generic_file_read() does a find_get_page(), and eventually locks the page before calling block_is_partially_uptodate(). However, it doesn't revalidate the page->mapping after the page is locked. So, there's a small window between the find_get_page() and ->is_partially_uptodate() where the page could get truncated and page->mapping cleared. We _have_ a reference, so it can't get reclaimed, but it certainly can be truncated. I think the correct thing is to check page->mapping after the trylock_page(), and jump out if it got truncated. This patch has been running in the test environment for a month or so now, and we have not seen this bug pop up again. xmon info: 1f:mon> e cpu 0x1f: Vector: 300 (Data Access) at [c0000002ae36f770] pc: c0000000001e7a6c: .block_is_partially_uptodate+0xc/0x100 lr: c000000000142944: .generic_file_aio_read+0x1e4/0x770 sp: c0000002ae36f9f0 msr: 8000000000009032 dar: 0 dsisr: 40000000 current = 0xc000000378f99e30 paca = 0xc000000000f66300 pid = 21946, comm = bash 1f:mon> r R00 = 0025c0500000006d R16 = 0000000000000000 R01 = c0000002ae36f9f0 R17 = c000000362cd3af0 R02 = c000000000e8cd80 R18 = ffffffffffffffff R03 = c0000000031d0f88 R19 = 0000000000000001 R04 = c0000002ae36fa68 R20 = c0000003bb97b8a0 R05 = 0000000000000000 R21 = c0000002ae36fa68 R06 = 0000000000000000 R22 = 0000000000000000 R07 = 0000000000000001 R23 = c0000002ae36fbb0 R08 = 0000000000000002 R24 = 0000000000000000 R09 = 0000000000000000 R25 = c000000362cd3a80 R10 = 0000000000000000 R26 = 0000000000000002 R11 = c0000000001e7b60 R27 = 0000000000000000 R12 = 0000000042000484 R28 = 0000000000000001 R13 = c000000000f66300 R29 = c0000003bb97b9b8 R14 = 0000000000000001 R30 = c000000000e28a08 R15 = 000000000000ffff R31 = c0000000031d0f88 pc = c0000000001e7a6c .block_is_partially_uptodate+0xc/0x100 lr = c000000000142944 .generic_file_aio_read+0x1e4/0x770 msr = 8000000000009032 cr = 22000488 ctr = c0000000001e7a60 xer = 0000000020000000 trap = 300 dar = 0000000000000000 dsisr = 40000000 1f:mon> t [link register ] c000000000142944 .generic_file_aio_read+0x1e4/0x770 [c0000002ae36f9f0] c000000000142a14 .generic_file_aio_read+0x2b4/0x770 (unreliable) [c0000002ae36fb40] c0000000001b03e4 .do_sync_read+0xd4/0x160 [c0000002ae36fce0] c0000000001b153c .vfs_read+0xec/0x1f0 [c0000002ae36fd80] c0000000001b1768 .SyS_read+0x58/0xb0 [c0000002ae36fe30] c00000000000852c syscall_exit+0x0/0x40 --- Exception: c00 (System Call) at 00000080a840bc54 SP (fffca15df30) is in userspace 1f:mon> di c0000000001e7a6c c0000000001e7a6c e9290000 ld r9,0(r9) c0000000001e7a70 418200c0 beq c0000000001e7b30 # .block_is_partially_uptodate+0xd0/0x100 c0000000001e7a74 e9440008 ld r10,8(r4) c0000000001e7a78 78a80020 clrldi r8,r5,32 c0000000001e7a7c 3c000001 lis r0,1 c0000000001e7a80 812900a8 lwz r9,168(r9) c0000000001e7a84 39600001 li r11,1 c0000000001e7a88 7c080050 subf r0,r8,r0 c0000000001e7a8c 7f805040 cmplw cr7,r0,r10 c0000000001e7a90 7d6b4830 slw r11,r11,r9 c0000000001e7a94 796b0020 clrldi r11,r11,32 c0000000001e7a98 419d00a8 bgt cr7,c0000000001e7b40 # .block_is_partially_uptodate+0xe0/0x100 c0000000001e7a9c 7fa55840 cmpld cr7,r5,r11 c0000000001e7aa0 7d004214 add r8,r0,r8 c0000000001e7aa4 79080020 clrldi r8,r8,32 c0000000001e7aa8 419c0078 blt cr7,c0000000001e7b20 # .block_is_partially_uptodate+0xc0/0x100 Signed-off-by:Dave Hansen <dave@linux.vnet.ibm.com> Reviewed-by:
Rik van Riel <riel@redhat.com> Cc: <arunabal@in.ibm.com> Cc: <sbest@us.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: <stable@kernel.org> Signed-off-by:
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Alexey Khoroshilov authored
clean_sort_range() should return a number of nonempty elements of range array, but if the array is full clean_sort_range() returns 0. The problem is that the number of nonempty elements is evaluated by finding the first empty element of the array. If there is no such element it returns an initial value of local variable nr_range that is zero. The fix is trivial: it changes initial value of nr_range to size of the array. The bug can lead to loss of information regarding all ranges, since typically returned value of clean_sort_range() is considered as an actual number of ranges in the array after a series of add/subtract operations. Found by Analytical Verification project of Linux Verification Center (linuxtesting.org), thanks to Alexander Kolosov. Signed-off-by:
Alexey Khoroshilov <khoroshilov@ispras.ru> Cc: Yinghai Lu <yinghai@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Dan Carpenter authored
There was a signedness bug so "ret" was never less than zero and that breaks the error handling. Also in the original code it would overwrite ret and the result is still negative but it's bogus number instead of the correct error code. Signed-off-by:
Dan Carpenter <error27@gmail.com> Cc: Samu Onkalo <samu.p.onkalo@nokia.com> Cc: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by:
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Dan Carpenter authored
The original code had a null dereference if alloc_percpu() failed. This was introduced in commit 711d3d2c ("memcg: cpu hotplug aware percpu count updates") Signed-off-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by:
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by:
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Vasiliy Kulikov authored
i2c_smbus_read_byte_data() may return negative error code. This is not seen to als_sensing_range_store() as the result is stored in unsigned int. Made it signed. Signed-off-by:
Vasiliy Kulikov <segooon@gmail.com> Cc: Hong Liu <hong.liu@intel.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Anantha Narayanan <anantha.narayanan@intel.com> Signed-off-by:
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Dan Carpenter authored
"ret_val" is supposed to be signed here or the error handling breaks. Also we should check the return value from i2c_smbus_read_byte_data(). Signed-off-by:
Alan Cox <alan@linux.intel.com> Signed-off-by:
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Catalin Marinas authored
Commit 3e4d3af5 ("mm: stack based kmap_atomic()") introduced the kmap_atomic_idx_push() function which warns on in_irq() with CONFIG_DEBUG_HIGHMEM enabled. This patch includes linux/hardirq.h for the in_irq definition. Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Acked-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:
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Eric Dumazet authored
Followup of perf tools session in Netfilter WorkShop 2010 In the network stack we make high usage of atomic_inc_not_zero() in contexts we know the probable value of atomic before increment (2 for udp sockets for example) Using a special version of atomic_inc_not_zero() giving this hint can help processor to use less bus transactions. On x86 (MESI protocol) for example, this avoids entering Shared state, because "lock cmpxchg" issues an RFO (Read For Ownership) akpm: Adds a new include/linux/atomic.h. This means that new code should henceforth include linux/atomic.h and not asm/atomic.h. The presence of include/linux/atomic.h will in fact cause checkpatch.pl to warn about use of asm/atomic.h. The new include/linux/atomic.h becomes the place where arch-neutral atomic_t code should be placed. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Eric Dumazet <eric.dumazet@gmail.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: David Miller <davem@davemloft.net> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Nick Piggin <npiggin@kernel.dk> Reviewed-by:
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by:
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Jean Delvare authored
Fix the following warning: usr/include/linux/resource.h:49: found __[us]{8,16,32,64} type without #include <linux/types.h> Signed-off-by:Jean Delvare <khali@linux-fr.org> Signed-off-by:
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Dan Carpenter authored
The size calculation is done incorrectly here because it should include both the start and end (end - start + 1). It's easiest to just use resource_size() which does the right thing. I was worried there was something non-standard going on because the printk() subtracts "end - 1", but the rest of the file uses the normal resource size calculations. This function is only called from fsl_rio_setup() in arch/powerpc/sysdev/fsl_rio.c and the calculation there is also: port->iores.start = law_start; port->iores.end = law_start + law_size - 1; So I think this is the correct fix. Signed-off-by:
Li Yang <leoli@freescale.com> Signed-off-by:
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Geert Uytterhoeven authored
Fix these warnings: drivers/macintosh/adb-iop.c: In function `adb_iop_complete': drivers/macintosh/adb-iop.c:85: warning: comparison of distinct pointer types lacks a cast drivers/macintosh/adb-iop.c:92: warning: comparison of distinct pointer types lacks a cast drivers/macintosh/adb-iop.c: In function ¡adb_iop_listen¢: drivers/macintosh/adb-iop.c:111: warning: comparison of distinct pointer types lacks a cast drivers/macintosh/adb-iop.c:151: warning: comparison of distinct pointer types lacks a cast Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Richard Weinberger authored
Both commits 0a3d763f ("ptrace: cleanup arch_ptrace() on um") and 9b05a69e ("ptrace: change signature of arch_ptrace()") broke the um build. This patch fixes the issues. 0a3d763f introduced the undeclared variable "datavp". The patch seems completely untested. :-( 9b05a69e changed arch_ptrace()'s signature but did not update um/include/asm/ptrace-generic.h. Signed-off-by:
Richard Weinberger <richard@nod.at> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Tested-by:
Will Newton <will.newton@gmail.com> Signed-off-by:
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- 09 Nov, 2010 5 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: fix a memleak in cifs_setattr_nounix() cifs: make cifs_ioctl handle NULL filp->private_data correctly
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Pekka Enberg authored
As pointed out by Linus, commit dab5855b ("perf_counter: Add mmap event hooks to mprotect()") is fundamentally wrong as mprotect_fixup() can free 'vma' due to merging. Fix the problem by moving perf_event_mmap() hook to mprotect_fixup(). Note: there's another successful return path from mprotect_fixup() if old flags equal to new flags. We don't, however, need to call perf_event_mmap() there because 'perf' already knows the VMA is executable. Reported-by:
Pekka Enberg <penberg@kernel.org> Signed-off-by:
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Suresh Jayaraman authored
Andrew Hendry reported a kmemleak warning in 2.6.37-rc1 while editing a text file with gedit over cifs. unreferenced object 0xffff88022ee08b40 (size 32): comm "gedit", pid 2524, jiffies 4300160388 (age 2633.655s) hex dump (first 32 bytes): 5c 2e 67 6f 75 74 70 75 74 73 74 72 65 61 6d 2d \.goutputstream- 35 42 41 53 4c 56 00 de 09 00 00 00 2c 26 78 ee 5BASLV......,&x. backtrace: [<ffffffff81504a4d>] kmemleak_alloc+0x2d/0x60 [<ffffffff81136e13>] __kmalloc+0xe3/0x1d0 [<ffffffffa0313db0>] build_path_from_dentry+0xf0/0x230 [cifs] [<ffffffffa031ae1e>] cifs_setattr+0x9e/0x770 [cifs] [<ffffffff8115fe90>] notify_change+0x170/0x2e0 [<ffffffff81145ceb>] sys_fchmod+0x10b/0x140 [<ffffffff8100c172>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff The commit 1025774c that removed inode_setattr() seems to have introduced this memleak by returning early without freeing 'full_path'. Reported-by:Andrew Hendry <andrew.hendry@gmail.com> Cc: Christoph Hellwig <hch@lst.de> Reviewed-by:
Jeff Layton <jlayton@redhat.com> Signed-off-by:
Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by:
Steve French <sfrench@us.ibm.com>
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Linus Torvalds authored
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: kernel: Constify temporary variable in roundup()
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Tetsuo Handa authored
Fix build error with GCC 3.x caused by commit b28efd54 "kernel: roundup should only reference arguments once" by constifying temporary variable used in that macro. Signed-off-by:
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Suggested-by:
Eric Paris <eparis@redhat.com> Signed-off-by:
James Morris <jmorris@namei.org>
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- 08 Nov, 2010 2 commits
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Meelis Roos authored
Fix openpromfs compilation by adding a missing semicolon in fs/openpromfs/inode.c openprom_mount(). Signed-off-by:
Meelis Roos <mroos@linux.ee> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4Linus Torvalds authored
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: Add new ext4 inode tracepoints ext4: Don't call sb_issue_discard() in ext4_free_blocks() ext4: do not try to grab the s_umount semaphore in ext4_quota_off ext4: fix potential race when freeing ext4_io_page structures ext4: handle writeback of inodes which are being freed ext4: initialize the percpu counters before replaying the journal ext4: "ret" may be used uninitialized in ext4_lazyinit_thread() ext4: fix lazyinit hang after removing request
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