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* hwmon: applesmc: Add support for MacBook Air 2Henrik Rydberg2009-01-061-0/+10
| | | | | | | | | Add temperature sensor support for MacBook Air 2. Signed-off-by: Henrik Rydberg <rydberg@euromail.se> Cc: Nicolas Boichat <nicolas@boichat.ch> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/macintosh: Add missing of_node_put in therm_adt746x.cNicolas Palix2009-01-061-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | of_node_put is needed before discarding a value received from of_find_node_by_name, eg in error handling code or when the device node is no longer used. The semantic match that catches the bug is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r exists@ local idexpression struct device_node *n; position p1, p2; struct device_node *n1; statement S; identifier f; expression E; expression *ptr != NULL; @@ n@p1 = of_find_node_by_name(...) ... if (!n) S ... when != of_node_put(n) when != n1 = f(n,...) when != E = n when any when strict ( return \(0\|<+...n...+>\|ptr\); | return@p2 ...; | of_node_put(n); | n1 = f(n,...) | E = n ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s of_find_node_by_name %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Nicolas Palix <npalix@diku.dk> Signed-off-by: Julia Lawall <julia@diku.dk> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* adt7470: make automatic fan control really workDarrick J. Wong2009-01-062-33/+142
| | | | | | | | | | | | It turns out that the adt7470's automatic fan control algorithm only works when the temperature sensors get updated. This in turn happens only when someone tells the chip to read its temperature sensors. Regrettably, this means that we have to drive the chip periodically. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* adt7470: observe the number of temperature sensors to shorten update timeDarrick J. Wong2009-01-061-8/+48
| | | | | | | | | | | | | The adt7470 driver currently assumes that 1s is the proper time to wait to read all temperature sensors. However, the correct time is 200ms * number_of_sensors. This patch sets the default time to provide for 10 sensors and then lowers it based on the number of sensor inputs that have nozero values. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* adt7470: fix pwm at a certain level during temperature sensor scanDarrick J. Wong2009-01-061-1/+24
| | | | | | | | | | | | | | In the small window that it takes to read the temperature sensors, the pwm outputs momentarily drop to 0. This causes a noticeable hiccup in fan speed, which is slightly annoying. The solution is to manually program the pwm output with whatever the automatic value is and then shift the fans to manual control while reading temperatures. Once that is done, put the fans back to whatever mode of control was there before. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* adt74{62, 70, 73}: Use DIV_ROUND_CLOSEST for rounded divisionDarrick J. Wong2009-01-063-19/+13
| | | | | | | | | | Modify some hwmon drivers to use DIV_ROUND_CLOSEST instead of bloating source with (naughty) macros. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: version: 0.26Andy Whitcroft2009-01-061-1/+1
| | | | | | Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: fix the perlcritic errorsAndy Whitcroft2009-01-061-7/+13
| | | | | | | | Clean up checkpatch using perlcritic. Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: struct file_operations should normally be constAndy Whitcroft2009-01-061-0/+5
| | | | | | | | | | | In the general use case struct file_operations should be a const object. Check for and warn where it is not. As suggested by Steven and Ingo. Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: ensure we actually detect if assignments split across linesAndy Whitcroft2009-01-061-1/+1
| | | | | | | | | | | When checking for assignments within if conditionals we check the whole of the condition, but the match is performed using a line constrained regular expression. This means we can miss split conditionals or those on the second line. Allow the check to span lines. Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: do not report nr_static as a static declarationAndy Whitcroft2009-01-061-1/+1
| | | | | | | | | | | | Ensure we do not report identifiers containing the word static as static declarations. For example this should not be reported as an unecessary assignement of 0: long nr_static = 0; Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: track #ifdef/#else/#endif when tracking blocksAndy Whitcroft2009-01-061-0/+22
| | | | | | | | | | When picking up a complete statement or block for analysis we cannot simply track open/close/etc parenthesis we must take into account preprocessor section boundaries. Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: fix continuation detection when handling spacing on operatorsAndy Whitcroft2009-01-061-1/+1
| | | | | | | | | | We are miscategorising a continuation fragment following an operator which may lead to us thinking that there is a space after it when there is not. Fix this up. Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: loosen spacing on typedef function checksAndy Whitcroft2009-01-061-1/+1
| | | | | | | | | | Loosen spacing checks to correctly detect this valid use of a typedef: typedef struct rcu_data *(*get_data_func)(int); Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: try to catch missing VMLINUX_SYMBOL() in vmlinux.lds.hMike Frysinger2009-01-061-0/+9
| | | | | | | | | | | | | Seems like every other release we have someone who updates vmlinux.lds.h and adds C-visible symbols without VMLINUX_SYMBOL() around them. So start checking the file and reject assignments which have plain symbols on either side. [apw@canonical.com: soften the check, add tests] Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: allow parentheses on return for comparisonsAndy Whitcroft2009-01-061-2/+3
| | | | | | | | | | | It seems to be a common idiom to include braces on conditionals in all contexts including return. Allow this exception to the return is not a function checks. Reported by Kay Sievers. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: Add warning for p0-patchesWolfram Sang2009-01-061-1/+7
| | | | | | | | | | | | | | | | Some people work internally with -p0-patches which has the danger that one forgets to convert them to -p1 before mainlining. Bitten myself and seen p0-patches in mailing lists occasionally, this patch adds a warning to checkpatch.pl in case a patch is -p0. If you really want, you can fool this check to generate false positives, this is why it just spits a warning. Making the check 100% proof is trickier than it looks, so let's start with a version which catches the cases of real use. [apw@canonical.com: update message language, handle null prefix, add tests] Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: update copyrightsAndy Whitcroft2009-01-061-1/+2
| | | | | | Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: update MAINTAINERS entryAndy Whitcroft2009-01-061-5/+2
| | | | | | | | | | | | Update my email address to my new work address. Also, as per our recent email conversation remove Randy and Joel from the maintainers list. Finally add LKML so that emails are recorded somewhere. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Joel Schopp <jschopp@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: version: 0.25Andy Whitcroft2009-01-061-1/+1
| | | | | | Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: dissallow spaces between stars in pointer typesAndy Whitcroft2009-01-061-14/+32
| | | | | | | | | | | | | | | Disallow spaces within multiple pointer stars (*) in both casts and definitions. Both of these would now be reported: (char * *) char * *foo; Also now consistently detects and reports the attributes within these structures making the error report itself clearer. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: comment ends inside strings is most likely not an open commentAndy Whitcroft2009-01-061-3/+6
| | | | | | | | | | | | | | When we are detecting whether a comment is open when we start a hunk we check for the first comment edge in the hunk and assume its inverse. However if the hunk contains something like below, then we will assume that a comment was open. Update this heuristic to see if the comment edge is obviously within double quotes and ignore it if so: foo(" */); Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: detect multiple bitfield declarationsAndy Whitcroft2009-01-061-5/+9
| | | | | | | | | | | | Detect the colons (:) which make up secondary bitfield declarations and apply binary colon checks. For example the following is common idiom: int foo:1, bar:1; Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: __weak is an official attributeAndy Whitcroft2009-01-061-1/+2
| | | | | | | | | Add __weak as an official attribute. This tends to be used in a location where the automated attribute detector misses it. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: structure member assignments are not complexAndy Whitcroft2009-01-061-2/+3
| | | | | | | | | | | Ensure we do not trigger the complex macros checks on structure member assignment, for example: #define foo .bar = 10 Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: widen implied comment detection to allow multiple starsAndy Whitcroft2009-01-061-1/+1
| | | | | | | | | | Some people use double star '**' as a comment continuation, and start comments with complete lines of stars. Widen the implied comment detection to pick these up. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: comment detection may miss an implied comment on the last hunkAndy Whitcroft2009-01-061-2/+2
| | | | | | | | | | When detecting implied comments from leading stars we may incorrectly think we have detected an edge one way or the other when we have not if we drop off the end of the last hunk. Fix this up. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* checkpatch: add checks for in_atomic()Andy Whitcroft2009-01-061-0/+9
| | | | | | | | | | in_atomic() is not for driver use so report any such use as an ERROR. Also in_atomic() is often used to determine if we may sleep, but it is not reliable in this use model therefore strongly discourage its use. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: fix function param name in kernel-docRandy Dunlap2009-01-061-1/+1
| | | | | | | | | | | Fix function parameter name in kernel-doc: Warning(linux-2.6.28-git5//fs/block_dev.c:1272): No description found for parameter 'pathname' Warning(linux-2.6.28-git5//fs/block_dev.c:1272): Excess function parameter 'path' description in 'lookup_bdev' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* include/linux/interrupt.h: do not include linux/irqnr.h twiceJesper Juhl2009-01-061-1/+0
| | | | | | Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sysrq: more explicit, less terse help messagesRandy Dunlap2009-01-061-10/+10
| | | | | | | | | | | | | | | | | | Eliminate sysrq terse help mode; make sysrq help messages more meaningful (more explicit/verbose). Make the sysrq action letter clearer by listing it explicitly in more sysrq help messages (when it is not simple/clear). The SysRq help message now looks like this: SysRq : HELP : loglevel(0-9) reBoot terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W) Addresses http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=330403. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: <jidanni@jidanni.org> Cc: <330403@bugs.debian.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs/inode: fix kernel-doc notationRandy Dunlap2009-01-061-4/+4
| | | | | | | | | | | | | | Fix kernel-doc notation: Warning(linux-2.6.28-git3//fs/inode.c:120): No description found for parameter 'sb' Warning(linux-2.6.28-git3//fs/inode.c:120): No description found for parameter 'inode' Warning(linux-2.6.28-git3//fs/inode.c:588): No description found for parameter 'sb' Warning(linux-2.6.28-git3//fs/inode.c:588): No description found for parameter 'inode' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Remove obsolete CONFIG_RESOURCES_64BITGeert Uytterhoeven2009-01-061-6/+0
| | | | | | | | | | | commit 8308c54d7e312f7a03e2ce2057d0837e6fe3843f ("generic: redefine resource_size_t as phys_addr_t") made CONFIG_RESOURCES_64BIT obsolete, but didn't remove it. Remove it. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* do_coredump(): check return from argv_split()Tetsuo Handa2009-01-061-0/+5
| | | | | | | | | do_coredump() accesses helper_argv[0] without checking helper_argv != NULL. This can happen if page allocation failed. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* profile: don't include <asm/ptrace.h> twice.KOSAKI Motohiro2009-01-061-1/+0
| | | | | | | | | Currently, kernel/profile.c include <asm/ptrace.h> twice. It can be removed. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* init/main.c: mark late_time_init as __initdataJan Beulich2009-01-061-1/+1
| | | | | | Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* add missing accounting calls to compat_sys_{readv,writev}Gerd Hoffmann2009-01-061-0/+6
| | | | | | | | Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Cc: Jay Lan <jlan@engr.sgi.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: fix name overwrite in __register_chrdev_region()Cyrill Gorcunov2009-01-061-1/+1
| | | | | | | | | | | | It's possible to register a chrdev with a name size exactly the same as was allocated in structure. It seems it was not intended behaviour. At least chrdev_show does not like it. Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* remove linux/hardirq.h from asm-generic/local.hRussell King2009-01-064-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While looking at reducing the amount of architecture namespace pollution in the generic kernel, I found that asm/irq.h is included in the vast majority of compilations on ARM (around 650 files.) Since asm/irq.h includes a sub-architecture include file on ARM, this causes a negative impact on the ccache's ability to re-use the build results from other sub-architectures, so we have a desire to reduce the dependencies on asm/irq.h. It turns out that a major cause of this is the needless include of linux/hardirq.h into asm-generic/local.h. The patch below removes this include, resulting in some 250 to 300 files (around half) of the kernel then omitting asm/irq.h. My test builds still succeed, provided two ARM files are fixed (arch/arm/kernel/traps.c and arch/arm/mm/fault.c) - so there may be negative impacts for this on other architectures. Note that x86 does not include asm/irq.h nor linux/hardirq.h in its asm/local.h, so this patch can be viewed as bringing the generic version into line with the x86 version. [kosaki.motohiro@jp.fujitsu.com: add #include <linux/irqflags.h> to acpi/processor_idle.c] [adobriyan@gmail.com: fix sparc64] Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ioc4: automatically load sgiioc4 subordinate moduleBrent Casavant2009-01-061-0/+36
| | | | | | | | | | | | | | | Modify ioc4 to always load the sgiioc4 IDE module if the board carrying the IOC4 hardware actually implements the IDE interface (not all boards bring this functionality off the IOC4 chip). A drive hosted on the IDE interface may contain the root filesystem, and sgiioc4 doesn't load automatically as ioc4 owns the PCI device ID, not sgiioc4. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Michael Reed <mdr@sgi.com> Signed-off-by: Brent Casavant <bcasavan@sgi.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Dmitry has been renamedDmitry Eremin-Solenikov2009-01-062-1/+2
| | | | | | | | | My surname has changed due to marriage. Change MAINTAINERS entry and add .mailmap entry to reflect that. Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* percpu_counter: FBC_BATCH should be a variableEric Dumazet2009-01-064-14/+20
| | | | | | | | | | | | | | | | | | | | | For NR_CPUS >= 16 values, FBC_BATCH is 2*NR_CPUS Considering more and more distros are using high NR_CPUS values, it makes sense to use a more sensible value for FBC_BATCH, and get rid of NR_CPUS. A sensible value is 2*num_online_cpus(), with a minimum value of 32 (This minimum value helps branch prediction in __percpu_counter_add()) We already have a hotcpu notifier, so we can adjust FBC_BATCH dynamically. We rename FBC_BATCH to percpu_counter_batch since its not a constant anymore. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Allow times and time system calls to return small negative valuesPaul Mackerras2009-01-063-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At the moment, the times() system call will appear to fail for a period shortly after boot, while the value it want to return is between -4095 and -1. The same thing will also happen for the time() system call on 32-bit platforms some time in 2106 or so. On some platforms, such as x86, this is unavoidable because of the system call ABI, but other platforms such as powerpc have a separate error indication from the return value, so system calls can in fact return small negative values without indicating an error. On those platforms, force_successful_syscall_return() provides a way to indicate that the system call return value should not be treated as an error even if it is in the range which would normally be taken as a negative error number. This adds a force_successful_syscall_return() call to the time() and times() system calls plus their 32-bit compat versions, so that they don't erroneously indicate an error on those platforms whose system call ABI has a separate error indication. This will not affect anything on other platforms. Joakim Tjernlund added the fix for time() and the compat versions of time() and times(), after I did the fix for times(). Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: David S. Miller <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* documentation: when to BUG(), and when to not BUG()David Brownell2009-01-061-0/+17
| | | | | | | | | | | | | | | | | Provide some basic advice about when to use BUG()/BUG_ON(): never, unless there's really no better option. This matches my understanding of the standard policy ... which seems not to be written down so far, outside of LKML messages that I haven't bookmarked. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Hans Verkuil <hverkuil@xs4all.nl> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* poll: allow f_op->poll to sleepTejun Heo2009-01-064-21/+76
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | f_op->poll is the only vfs operation which is not allowed to sleep. It's because poll and select implementation used task state to synchronize against wake ups, which doesn't have to be the case anymore as wait/wake interface can now use custom wake up functions. The non-sleep restriction can be a bit tricky because ->poll is not called from an atomic context and the result of accidentally sleeping in ->poll only shows up as temporary busy looping when the timing is right or rather wrong. This patch converts poll/select to use custom wake up function and use separate triggered variable to synchronize against wake up events. The only added overhead is an extra function call during wake up and negligible. This patch removes the one non-sleep exception from vfs locking rules and is beneficial to userland filesystem implementations like FUSE, 9p or peculiar fs like spufs as it's very difficult for those to implement non-sleeping poll method. While at it, make the following cosmetic changes to make poll.h and select.c checkpatch friendly. * s/type * symbol/type *symbol/ : three places in poll.h * remove blank line before EXPORT_SYMBOL() : two places in select.c Oleg: spotted missing barrier in poll_schedule_timeout() Davide: spotted missing write barrier in pollwake() Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Ingo Molnar <mingo@elte.hu> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Brad Boyer <flar@allandria.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Roland McGrath <roland@redhat.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs: use menuconfig to control the Misc. filesystems menuRandy Dunlap2009-01-061-2/+15
| | | | | | | | | Have one option to control Miscellaneous filesystems. This makes it easy to disable all of them at one time. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* scripts: script from kerneloops.org to pretty print oops dumpsArjan van de Ven2009-01-061-0/+162
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We're struggling all the time to figure out where the code came from that oopsed.. The script below (a adaption from a script used by kerneloops.org) can help developers quite a bit, at least for non-module cases. It works and looks like this: [/home/arjan/linux]$ dmesg | perl scripts/markup_oops.pl vmlinux { struct agp_memory *memory; memory = agp_allocate_memory(agp_bridge, pg_count, type); c055c10f: 89 c2 mov %eax,%edx if (memory == NULL) c055c111: 74 19 je c055c12c <agp_allocate_memory_wrap+0x30> /* This function must only be called when current_controller != NULL */ static void agp_insert_into_pool(struct agp_memory * temp) { struct agp_memory *prev; prev = agp_fe.current_controller->pool; c055c113: a1 ec dc 8f c0 mov 0xc08fdcec,%eax *c055c118: 8b 40 10 mov 0x10(%eax),%eax <----- faulting instruction if (prev != NULL) { c055c11b: 85 c0 test %eax,%eax c055c11d: 74 05 je c055c124 <agp_allocate_memory_wrap+0x28> prev->prev = temp; c055c11f: 89 50 04 mov %edx,0x4(%eax) temp->next = prev; c055c122: 89 02 mov %eax,(%edx) } agp_fe.current_controller->pool = temp; c055c124: a1 ec dc 8f c0 mov 0xc08fdcec,%eax c055c129: 89 50 10 mov %edx,0x10(%eax) if (memory == NULL) return NULL; agp_insert_into_pool(memory); so in this case, we faulted while dereferencing agp_fe.current_controller pointer, and we get to see exactly which function and line it affects... Personally I find this very useful, and I can see value for having this script in the kernel for more-than-just-me to use. Caveats: * It only works for oopses not-in-modules * It only works nicely for kernels compiled with CONFIG_DEBUG_INFO * It's not very fast. * It only works on x86 Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* oops: increment the oops UUID every time we oopsArjan van de Ven2009-01-061-0/+2
| | | | | | | | | ... because we do want repeated same-oops to be seen by automated tools like kerneloops.org Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* strict_strto* is not strict enoughPavel Machek2009-01-061-0/+4
| | | | | | | | | | It decodes "\n" as 0, which is bad, because stray echo into backlight will turn your backlight off, etc... Signed-off-by: Pavel Machek <pavel@suse.cz> Cc: Yi Yang <yi.y.yang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* autodetect_raid: add missing __init markingMike Frysinger2009-01-061-1/+1
| | | | | | | | | | | | | The function autodetect_raid is only used by __init functions, and it refers to __initdata, so it needs __init markings. Fixes this error: The function autodetect_raid() references the variable __initdata raid_noautodetect. This is often because autodetect_raid lacks a __initdata annotation or the annotation of raid_noautodetect is wrong. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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