- 06 Feb, 2008 40 commits
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Paul E. McKenney authored
The rcu_assign_pointer() primitive currently unconditionally executes a memory barrier, even when a NULL pointer is being assigned. This has lead some to avoid using rcu_assign_pointer() for NULL pointers, which loses the self-documenting advantages of rcu_assign_pointer() This patch uses __builtin_const_p() to omit needless memory barriers for NULL-pointer assignments at compile time with no runtime penalty, as discussed in the following thread: http://www.mail-archive.com/netdev@vger.kernel.org/msg54852.html Tested on x86_64 and ppc64, also compiled the four cases (NULL/non-NULL and const/non-const) with gcc version 4.1.2, and hand-checked the assembly output. Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Qi Yong authored
Signed-off-by:
Qi Yong <qiyong@fc-cn.com> Signed-off-by:
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Matt Mackall authored
Reduce latency for large writes to /dev/[u]random Signed-off-by:
Matt Mackall <mpm@selenic.com> Cc: Sami Farin <safari-kernel@safari.iki.fi> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Jeff Dike authored
The declaration and implementation of __const_udelay use different names for the parameter on a number of architectures: include/asm-avr32/delay.h:15:extern void __const_udelay(unsigned long usecs); arch/avr32/lib/delay.c:39:inline void __const_udelay(unsigned long xloops) include/asm-sh/delay.h:15:extern void __const_udelay(unsigned long usecs); arch/sh/lib/delay.c:22:inline void __const_udelay(unsigned long xloops) include/asm-m32r/delay.h:15:extern void __const_udelay(unsigned long usecs); arch/m32r/lib/delay.c:58:void __const_udelay(unsigned long xloops) include/asm-x86/delay.h:16:extern void __const_udelay(unsigned long usecs); arch/x86/lib/delay_32.c:82:inline void __const_udelay(unsigned long xloops) arch/x86/lib/delay_64.c:46:inline void __const_udelay(unsigned long xloops) The units of the parameter isn't usecs, so that name is definitely wrong. It's also not exactly loops, so I suppose xloops is an OK name. This patch changes these names from usecs to xloops. Signed-off-by:
Jeff Dike <jdike@linux.intel.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by:
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Paul Fulghum authored
Fix missed serial input signal changes caused by rereading the serial status register during interrupt processing. Now processing is performed on original status register value. Signed-off-by:
Paul Fulghum <paulkf@microgate.com> Signed-off-by:
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Robert P. J. Day authored
Use the recommended form of "<>" to include linux header files, and move those includes up to join the rest of the linux includes. Signed-off-by:
Robert P. J. Day <rpjday@crashcourse.ca> Acked-by:
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Eric Dumazet authored
NR_OPEN (historically set to 1024*1024) actually forbids processes to open more than 1024*1024 handles. Unfortunatly some production servers hit the not so 'ridiculously high value' of 1024*1024 file descriptors per process. Changing NR_OPEN is not considered safe because of vmalloc space potential exhaust. This patch introduces a new sysctl (/proc/sys/fs/nr_open) wich defaults to 1024*1024, so that admins can decide to change this limit if their workload needs it. [akpm@linux-foundation.org: export it for sparc64] Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: "David S. Miller" <davem@davemloft.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Richard Knutsson authored
Complement va_start() with va_end(). Signed-off-by:
Richard Knutsson <ricknu-0@student.ltu.se> Signed-off-by:
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Dave Jones authored
In the padlock spec: "SRC Bits[9:8] Noise source select (I): These bits control the two noise sources on the processor that input bits to the accumulation buffers. On Nehemiah processors prior to stepping 8, these bits are reserved and undefined. The default RESET state is both bits = 0." Signed-off-by:
Dave Jones <davej@redhat.com> Tested-by:
Udo van den Heuvel <udovdh@xs4all.nl> Cc: Michael Buesch <mb@bu3sch.de> Cc: folkert van Heusden <folkert@vanheusden.com> Signed-off-by:
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Jan Kara authored
Currently, no notification event has been sent when inode's link count changed. This is inconvenient for the application in some cases: Suppose you have the following directory structure foo/test bar/ and you watch test. If someone does "mv foo/test bar/", you get event IN_MOVE_SELF and you know something has happened with the file "test". However if someone does "ln foo/test bar/test" and "rm foo/test" you get no inotify event for the file "test" (only directories "foo" and "bar" receive events). Furthermore it could be argued that link count belongs to file's metadata and thus IN_ATTRIB should be sent when it changes. The following patch implements sending of IN_ATTRIB inotify events when link count of the inode changes, i.e., when a hardlink to the inode is created or when it is removed. This event is sent in addition to all the events sent so far. In particular, when a last link to a file is removed, IN_ATTRIB event is sent in addition to IN_DELETE_SELF event. Signed-off-by:Jan Kara <jack@suse.cz> Acked-by:
Morten Welinder <mwelinder@gmail.com> Cc: Robert Love <rlove@google.com> Cc: John McCutchan <ttb@tentacle.dhs.org> Cc: Steven French <sfrench@us.ibm.com> Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by:
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Jiri Slaby authored
MAINTAINERS, order AUERSWALD alphabetically Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Cc: Wolfgang Muees <wolfgang@iksw-muees.de> Signed-off-by:
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Robert P. J. Day authored
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Eric Sandeen authored
Address Roman's review comments for the previously sent on-disk corruption hfs robustness patch. - use 0 as a failure value, rather than making a new macro HFS_BAD_KEYLEN, and use a switch statement instead of if's. - Add new fail: target to __hfs_brec_find to skip assignments using bad values when exiting with a failure. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Eric Sandeen <sandeen@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by:
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Robert P. J. Day authored
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Akinobu Mita authored
Use list_for_each_entry_reverse for super_blocks list and remove unused sb_entry macro. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by:
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Akinobu Mita authored
Use hlist_unhashed() instead of opencoded equivalent. Signed-off-by:
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Michal Schmidt authored
The avenrun[] values are supposed to be protected by xtime_lock. loadavg_read_proc does not use it. Theoretically this may result in an occasional glitch when the value read from /proc/loadavg would be as much as 1<<11 times higher than it should be. Signed-off-by:
Michal Schmidt <mschmidt@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Oleg Nesterov authored
Minor cleanup. We can remove one "else if" branch. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
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Herbert Xu authored
I was happy to discover the brand new IS_ALIGN macro and quickly used it in my code. To my dismay I found that the generated code used division to perform the test. This patch fixes it by changing the % test to an &. This avoids the division. Signed-off-by:
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Nick Piggin authored
vt is missing a memory barrier to close the critical section. Use a real spinlock for this. Signed-off-by:
Nick Piggin <npiggin@suse.de> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by:
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Richard MUSIL authored
The clean up procedure now uses platform device "release" callback to handle memory clean up. For this purpose "release" function callback was added to struct tpm_vendor_specific, so hw device driver provider can get called when it is safe to remove all allocated resources. This is supposed to fix a bug in device removal, where device while in receive function (waiting on timeout) was prone to segfault, if the tpm_chip struct was unallocated before the timeout expired (in tpm_remove_hardware). Acked-by:
Marcel Selhorst <tpm@selhorst.net> Cc: <stable@kernel.org> Signed-off-by:
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Denys Vlasenko authored
Stop using unsigned _longs_ for printk buffer indexes. Log buffer is way smaller than 2 gigabytes and unsigned ints will work too . Indeed, they do work nicely on all 32-bit platforms where longs and ints are the same. With this patch, we have following size savings on amd64: text data bss dec hex filename 5997 313 17736 24046 5dee 2.6.23.1.t64/kernel/printk.o 5858 313 17700 23871 5d3f 2.6.23.1.printk.t64/kernel/printk.o Signed-off-by:
Denys Vlasenko <vda.linux@googlemail.com> Signed-off-by:
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Eric Dumazet authored
Instead of allocating a fix sized array of NR_CPUS pointers for percpu_data, we can use nr_cpu_ids, which is generally < NR_CPUS. Signed-off-by:
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Joern Engel authored
After some archeology (see http://logfs.org/logfs/inode_state_bits) I finally figured out what the three I_DIRTY bits do. Maybe others would prefer less effort to reach this insight. Signed-off-by:
Joern Engel <joern@logfs.org> Signed-off-by:
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Jiri Olsa authored
Remove config variable DEBUG_RWLOCK, since it is not used. Signed-off-by:
Jiri Olsa <olsajiri@gmail.com> Acked-by:
Grant Grundler <grundler@parisc-linux.org> Acked-by:
Kyle McMartin <kyle@mcmartin.ca> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by:
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Jiri Olsa authored
Remove dead config CONFIG_HAS_COMPAT_EPOLL_EVENT symbol. Signed-off-by:
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Robert P. J. Day authored
Given a number of places in the tree that need to calculate this value explicitly, might as well just create a macro for it. (akpm: must be implemented as a macro for callee typeof() usage) Signed-off-by:
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Randy Dunlap authored
Use upper_32_bits(x) macro to handle shifts that may be >= the width of the data type. drivers/block/cciss.c: In function 'do_cciss_request': drivers/block/cciss.c:2655: warning: right shift count >= width of type drivers/block/cciss.c:2656: warning: right shift count >= width of type drivers/block/cciss.c:2657: warning: right shift count >= width of type drivers/block/cciss.c:2658: warning: right shift count >= width of type Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Cc: <mike.miller@hp.com> Signed-off-by:
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Miao Xie authored
I found that there is a buffer overflow problem in the following code. Version: 2.6.24-rc2, File: kernel/time/clocksource.c:417-432 -------------------------------------------------------------------- static ssize_t sysfs_show_available_clocksources(struct sys_device *dev, char *buf) { struct clocksource *src; char *curr = buf; spin_lock_irq(&clocksource_lock); list_for_each_entry(src, &clocksource_list, list) { curr += sprintf(curr, "%s ", src->name); } spin_unlock_irq(&clocksource_lock); curr += sprintf(curr, "\n"); return curr - buf; } ----------------------------------------------------------------------- sysfs_show_current_clocksources() also has the same problem though in practice the size of current clocksource's name won't exceed PAGE_SIZE. I fix the bug by using snprintf according to the specification of the kernel (Version:2.6.24-rc2,File:Documentation/filesystems/sysfs.txt) Fix sysfs_show_available_clocksources() and sysfs_show_current_clocksources() buffer overflow problem with snprintf(). Signed-off-by:Miao Xie <miaox@cn.fujitsu.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by:
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Roel Kluin authored
If count reaches zero, the loop ends, but the postfix decrement still subtracts: testing for 'count == 0' will not work. Signed-off-by:
Roel Kluin <12o3l@tiscali.nl> Reviewed-by:
Ray Lee <ray-lk@madrabbit.org> Acked-by:
Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by:
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Robert P. J. Day authored
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Adrian Bunk authored
- make needlessly global functions static - make lkdtm_module_{init,exit}() as __{init,exit} Signed-off-by:Adrian Bunk <bunk@kernel.org> Cc: Ankita Garg <ankita@in.ibm.com> Signed-off-by:
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Adrian Bunk authored
Add a proper prototype for vty_init() in include/linux/vt_kern.h Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the prototypes for its global functions (in this case sys_eventfd()). Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the prototypes for its global functions (in this case sys_signalfd()). Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the prototypes for its global functions. Signed-off-by:
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Adrian Bunk authored
Ad a proper prototype for migration_init() in include/linux/fs.h Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the prototypes for its global functions (in this case {,un}register_reboot_notifier()). Signed-off-by: -
Adrian Bunk authored
Make the needlessly global srcu_readers_active() static. Signed-off-by:
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Adrian Bunk authored
Every file should include the headers containing the prototypes for its global functions (in this case sys_ptrace()). Signed-off-by:
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