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2007-10-06[JFFS2] Trigger garbage collection when very_dirty_list size becomes excessiveDavid Woodhouse
With huge amounts of free space, we weren't bothering to GC for while a while, and pathological numbers of obsolete nodes were accumulating, seriously affecting performance on NAND flash (OLPC trac #3978) Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-10-06[MTD] [NAND] Avoid deadlock in erase callback; release chip lock first.David Woodhouse
When the erase callback performs some other action on the flash, it's highly likely to deadlock unless we actually release the chip lock before calling it. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-10-06[MTD] [NAND] Resume method for CAFÉ NAND controllerDavid Woodhouse
Originally from Marcelo; modified to put the original timing registers back instead of 0xFFFFFFFF. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-10-06[MTD] [NAND] Fix PCI ident table for CAFÉ NAND controller.David Woodhouse
It was only the very early prototypes which made the mistake of using the same device ident for all three functions on the device -- don't bother trying to express that in the PCI match table, since the tools don't cope. We can check in the probe routine instead, just in case. Also remember to terminate the table. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-10-06Merge branch 'master' of ssh://git.infradead.org/srv/git/mtd-2.6David Woodhouse
2007-09-25[MTD] [NAND] s3c2410: fix arch movesBen Dooks
Fixup the includes which have been moved around when changing the s3c24xx arch support. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-23[MTD] [OneNAND] fix numerous racesArtem Bityutskiy
This patch make the OneNAND driver much less racy. It fixes our "onenand_wait: read timeout!" heisenbugs. The reason of these bugs was that the driver did not lock the chip when accessing OTP, and it screwed up OneNAND state when the OTP was read while JFFS2 was doing FS checking. This patch also fixes other races I spotted: 1. BBT was not protected 2. Access to ecc_stats was not protected Now the chip is locked when BBT is accessed. To fix all of these I basically split all interface functions on 'function()' and 'function_nolock()' parts. I tested this patch on N800 hardware - it fixes our problems. But I tested a little different version because our OneNAND codebase is slightly out-of-date. But it should be OK. This patch also includes the prin fixes I posted before. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-23[MTD] map driver for NOR flash on the Intel Vermilion Range chipsetDavid Woodhouse
The Vermilion Range Expansion Bus supports four chip selects, each of which has 64MiB of address space. The 2nd BAR of the Expansion Bus PCI Device is a 256MiB memory region containing the address spaces for all four of the chip selects, with start addresses hardcoded on 64MiB boundaries. This map driver only supports NOR flash on chip select 0. The buswidth (either 8 bits or 16 bits) is determined by reading the Expansion Bus Timing and Control Register for Chip Select 0 (EXP_TIMING_CS0). Signed-off-by: Andy Lowe <alowe@mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-23[JFFS2] Fix unpoint lengthAndy Lowe
Fix a couple of instances in JFFS2 where the unpoint() routine is being called with the wrong length in cases where the point() routine truncated a request. Signed-off-by: Andy Lowe <alowe@mvista.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-23[MTD] fix CFI point method for discontiguous mapsAndy Lowe
The CFI probe routine is capable of detecting flash banks consisting of identical chips mapped to physically discontiguous addresses. (One common way this can occur is if a flash bank is populated with chips of less capacity than the hardware was designed to support.) The CFI point() routine currently ignores any such gaps. This patch fixes the CFI point() routine so that it truncates any request that would span a gap. Signed-off-by: Andy Lowe <alowe@mvista.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-23[MTD] MAPS: Merge Lubbock and Mainstone drivers into common PXA2xx driverTodd Poynor
Replace Lubbock and Mainstone board drivers with common PXA2xx driver, convert to platform driver (corresponding platform device changes merged to kernel.org for 2.6.15), add power management callbacks. Signed-off-by: Todd Poynor <tpoynor@mvista.com> Signed-off-by: Nicolas Pitre <npitre@mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-21[MTD] Document erase interface.Jörn Engel
Document mtd erase interface. Signed-off-by: Jörn Engel <joern@logfs.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-09[MTD] Remove Momenco Ocelot NOR flash supportYoichi Yuasa
This patch has removed Momenco Ocelot support from MTD. Ocelot support has already removed. Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-06[MTD] [NAND] nandsim: avoid deadlocking FSArtem Bityutskiy
Make nandsim use GFP_NOFS when allocating memory, because it might be used by a file-system (e.g. UBIFS2) which means, if we are short of memory, we may deadlock. Indee, UBIFS is holding a lock, writes to the media, reaches this place in NANDsim, kmalloc does not find the requested amount of RAM, calls memory shrinker, which decides to writeback inodes, calls FS, and it deadlocks on the lock which is already being held. Below is the UBIFS backtrace which demonstrates that: [<c03717dc>] __mutex_lock_slowpath+0xc8/0x2e6 [<c0371a16>] mutex_lock+0x1c/0x1f [<f8b9d076>] reserve_space+0x3d/0xa9 [ubifs] [<f8b9d1bd>] make_one_reservation+0x2b/0x86 [ubifs] [<f8b9d3fc>] ubifs_jrn_write_block+0xda/0x12f [ubifs] [<f8b9ff3a>] ubifs_writepage+0x11d/0x1ec [ubifs] [<c015d6ab>] shrink_inactive_list+0x7fa/0x969 [<c015d8c8>] shrink_zone+0xae/0x10c [<c015e3b4>] try_to_free_pages+0x159/0x251 [<c015980a>] __alloc_pages+0x125/0x2f0 [<c016ff6a>] cache_alloc_refill+0x380/0x6ba [<c01703f3>] __kmalloc+0x14f/0x157 [<f885722a>] do_state_action+0xab7/0xc74 [nandsim] [<f885760c>] switch_state+0x225/0x402 [nandsim] [<f8857e7e>] ns_hwcontrol+0x3e2/0x620 [nandsim] [<f8862f53>] nand_command+0x2e/0x1a5 [nand] [<f8861ad8>] nand_write_page+0x4a/0x9a [nand] [<f88617b4>] nand_do_write_ops+0x1cf/0x343 [nand] [<f8861a70>] nand_write+0x88/0xa6 [nand] [<f8850b0e>] part_write+0x72/0x8b [mtd] [<f88e19c5>] ubi_io_write+0x189/0x29c [ubi] [<f88dfb98>] ubi_eba_write_leb+0xb6/0x699 [ubi] [<f88def93>] ubi_leb_write+0xe4/0xe9 [ubi] [<f8ba3b82>] ubifs_wbuf_write_nolock+0x333/0x4c9 [ubifs] [<f8b9d28c>] write_node+0x74/0x8e [ubifs] [<f8b9d422>] ubifs_jrn_write_block+0x100/0x12f [ubifs] [<f8b9ff3a>] ubifs_writepage+0x11d/0x1ec [ubifs] [<c0159e5b>] __writepage+0xb/0x26 [<c015a318>] write_cache_pages+0x203/0x2d9 [<c015a411>] generic_writepages+0x23/0x2d [<c015a452>] do_writepages+0x37/0x39 [<c018e24a>] __writeback_single_inode+0x96/0x399 [<c018e903>] sync_sb_inodes+0x1a3/0x274 [<c018ebf3>] writeback_inodes+0xa6/0xd8 [<c015a9dd>] background_writeout+0x86/0x9e [<c015ae9c>] pdflush+0xfb/0x1b6 [<c01387d7>] kthread+0x37/0x59 [<c0104dc3>] kernel_thread_helper+0x7/0x14 The deadlock is funny because it starts in pdflush/writeback, and comes back to writeback, then deadlocks. It seems we should look carefully for other places in UBI and MTD and use GFP_NOFS instead of GFP_KERNEL. Caught-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-06[MTD] Fix CFI build error when no map width or interleave supportedDavid Woodhouse
When building NOR flash support, you have compile-time options for the bus width and the number of individual chips which are interleaved together onto that bus. The code to deal with arbitrary geometry is a bit convoluted, and people want to just configure it for the specific hardware they have, to avoid the runtime overhead. Selecting _none_ of the available options doesn't make any sense. You should have at least one. This makes it build though, since people persist in trying. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-09-06[MTD] [OneNAND] main read/write ops support for yaffs2Kyungmin Park
Now we can use yaffs2 on OneNAND Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-08-30[MTD] [OneNAND] Use mtd_oob_ops at oob functionsKyungmin Park
To enable the main read/write at oob ops Next time we will commit the main read/write support for yaffs2 Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-08-29[MTD] [NAND] Driver for Olympus MAUSB-10 and Fujifilm DPC-R1 card readersJörn Engel
Unlike most stuff on the market the chip inside these two allows raw flash access and doesn't implement and FTL, leaving that functionality to the device driver. Raw flash access in a cheap USB cardreader! An MTD test device one can attach to a PC! What a deal! The command set of the chip is not documented, so information was obtained from the existing mass-storage driver (drivers/usb/storage/alauda.c), its documentation (http://alauda.sourceforge.net/wikka.php?wakka=BulkCommandReference), additional reverse engineering and comparison with a vendor driver for a related chip (http://www.ratocsystems.com/english/download/driver/linux/sma03u.html). Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-08-23Merge branch 'mtd-2.6.24' of ↵David Woodhouse
master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc
2007-08-23Merge branch 'master' of ↵David Woodhouse
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
2007-08-22[MTD] Remove dead mapsKumar Gala
The tqm834x map Kconfig options depends on TQM834x which does not exist anywhere else in the kernel. The pq2fads map Kconfig/makefile support was removed a while ago but the actual file persisted. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-08-22[MTD] 4xx: Don't build arch/ppc dependent drivers in arch/powerpcJosh Boyer
These drivers are specific to 4xx support in arch/ppc at the moment. Make sure they don't get built on arch/powerpc. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-08-22Apply memory policies to top two highest zones when highest zone is ZONE_MOVABLEMel Gorman
The NUMA layer only supports NUMA policies for the highest zone. When ZONE_MOVABLE is configured with kernelcore=, the the highest zone becomes ZONE_MOVABLE. The result is that policies are only applied to allocations like anonymous pages and page cache allocated from ZONE_MOVABLE when the zone is used. This patch applies policies to the two highest zones when the highest zone is ZONE_MOVABLE. As ZONE_MOVABLE consists of pages from the highest "real" zone, it's always functionally equivalent. The patch has been tested on a variety of machines both NUMA and non-NUMA covering x86, x86_64 and ppc64. No abnormal results were seen in kernbench, tbench, dbench or hackbench. It passes regression tests from the numactl package with and without kernelcore= once numactl tests are patched to wait for vmstat counters to update. akpm: this is the nasty hack to fix NUMA mempolicies in the presence of ZONE_MOVABLE and kernelcore= in 2.6.23. Christoph says "For .24 either merge the mobility or get the other solution that Mel is working on. That solution would only use a single zonelist per node and filter on the fly. That may help performance and also help to make memory policies work better." Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Tested-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Acked-by: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22au1100fb: move au1100fb_fb_blank() beforce au1100fb_setmode()Yoichi Yuasa
au1100fb_fb_blank() should come before au1100fb_setmode(). drivers/video/au1100fb.c: In function 'au1100fb_setmode': drivers/video/au1100fb.c:211: error: implicit declaration of function 'au1100fb_fb_blank' Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22newport_con warning fixAndrew Morton
drivers/video/console/newport_con.c: In function `newport_console_init': drivers/video/console/newport_con.c:743: warning: return makes integer from pointer without a cast Although one wonders whether that should have been -ENODEV... Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22selection.h: add tty_struct forward declarationAndrew Morton
In file included from drivers/video/console/newport_con.c:16: include/linux/selection.h:16: warning: "struct tty_struct" declared inside parameter list include/linux/selection.h:16: warning: its scope is only this definition or declaration, which is probably not what you want Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22Check for PPC32 in imsttfbStephen Rothwell
This is the correct fix according to Paul Mackerras and allows an allyesconfig on PPC64 to build. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Mackerras <paulus@samba.org> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22Xen i386 xen-head.S fix sections mixupMathieu Desnoyers
Xen i386 xen-head.S fix sections mixup xen-head.S does not come back to the data section, leaving the text section as current section. It causes problems with a slightly enhanced DEBUG_RODATA that supports CONFIG_HOTPLUG and bringing a CPU up after the text has been marked read-only: reference to early_gdt_descr causes a page fault. Updates: - It should be using pushsection/popsection. - Actually, the push/popsections around the ELFNOTEs are redundant; ELFNOTE() does its own push/popsection to put things into the appropriate .note* section anyway. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22exec: kill unsafe BUG_ON(sig->count) checksOleg Nesterov
de_thread: if (atomic_read(&oldsighand->count) <= 1) BUG_ON(atomic_read(&sig->count) != 1); This is not safe without the rmb() in between. The results of two correctly ordered __exit_signal()->atomic_dec_and_test()'s could be seen out of order on our CPU. The same is true for the "thread_group_empty()" case, __unhash_process()'s changes could be seen before atomic_dec_and_test(&sig->count). On some platforms (including i386) atomic_read() doesn't provide even the compiler barrier, in that case these checks are simply racy. Remove these BUG_ON()'s. Alternatively, we can do something like BUG_ON( ({ smp_rmb(); atomic_read(&sig->count) != 1; }) ); Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22rtc-max6902 minor fixesDavid Brownell
Minor tweaks to rtc-max6902: make it hotplug correctly, and fix a few space-before-tab whitespace botches. This driver has no current in-tree users, so the hotplug fix changes the driver name. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22SLUB: do not fail on broken memory configurationsChristoph Lameter
Print a big fat warning and do what is necessary to continue if a node is marked as up (meaning either node is online (upstream) or node has memory (Andrew's tree)) but allocations from the node do not succeed. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22SLUB: use atomic_long_read for atomic_long variablesChristoph Lameter
SLUB is using atomic_read() for variables declared atomic_long_t. Switch to atomic_long_read(). Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22cfag12864b fixMiguel Ojeda
This one-liner patch fixes a bug in drivers/auxdisplay/cfag12864b.c At cfag12864b_init(), the driver tries to kalloc some memory in the variable cfag12864b_cache. Then, as usual, it checks if the call failed. However, it checks cfag12864b_buffer instead. This patch changes the "cfag12864b_buffer" to "cfag12864b_cache" so the correct variable is checked. Signed-off-by: Miguel Ojeda <maxextreme@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22serial: add pci ids for PA Semi PWRficient onchip uartsOlof Johansson
Add PCI IDs for the onchip UARTs on PA Semi PWRficient. Signed-off-by: Olof Johansson <olof@lixom.net> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22autofs4: deadlock during createIan Kent
Due to inconsistent locking in the VFS between calls to lookup and revalidate deadlock can occur in the automounter. The inconsistency is that the directory inode mutex is held for both lookup and revalidate calls when called via lookup_hash whereas it is held only for lookup during a path walk. Consequently, if the mutex is held during a call to revalidate autofs4 can't release the mutex to callback the daemon as it can't know whether it owns the mutex. This situation happens when a process tries to create a directory within an automount and a second process also tries to create the same directory between the lookup and the mkdir. Since the first process has dropped the mutex for the daemon callback, the second process takes it during revalidate leading to deadlock between the autofs daemon and the second process when the daemon tries to create the mount point directory. After spending quite a bit of time trying to resolve this on more than one occassion, using rather complex and ulgy approaches, it turns out that just delaying the hashing of the dentry until the create operation works fine. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22uml: fix previous request size limit fixJeff Dike
The previous patch which limited the number of sectors in a single request to a COWed device was correct in concept, but the limit was implemented in the wrong place. By putting it in ubd_add, it covered the cases where the COWing was specified on the command line. However, when the command line only has the COW file specified, the fact that it's a COW file isn't known until it's opened, so the limit is missed in these cases. This patch moves the sector limit from ubd_add to ubd_open_dev. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22md: correctly update sysfs when a raid1 is reshapedNeilBrown
When a raid1 array is reshaped (number of drives changed), the list of devices is compacted, so that slots for missing devices are filled with working devices from later slots. This requires the "rd%d" symlinks in sysfs to be updated. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22md: make sure a re-add after a restart honours bitmap when resyncingNeilBrown
Commit 1757128438d41670ded8bc3bc735325cc07dc8f9 was slightly bad. If an array has a write-intent bitmap, and you remove a drive, then readd it, only the changed parts should be resynced. However after the above commit, this only works if the array has not been shut down and restarted. This is because it sets 'fullsync' at little more often than it should. This patch is more careful. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22w1: fix w1_remove_master_device() searchingEvgeniy Polyakov
In case bus master driver provided bogus value as its private data, search can be incorrect. Problem found by Adrian Bunk. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22Fix VM_FAULT flags conversion for hugetlbAdam Litke
It seems a simple mistake was made when converting follow_hugetlb_page() over to the VM_FAULT flags bitmasks (in "mm: fault feedback #2", commit 83c54070ee1a2d05c89793884bea1a03f2851ed4). By using the wrong bitmask, hugetlb_fault() failures are not being recognized. This results in an infinite loop whenever follow_hugetlb_page is involved in a failed fault. Signed-off-by: Adam Litke <agl@us.ibm.com> Acked-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22synclink_gt fix module referencePaul Fulghum
Get module reference on open() by generic HDLC to prevent module from unloading while interface is active. Signed-off-by: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22slab: skip calling cache_free_alien() when the platform is not numa capableSiddha, Suresh B
Skip calling cache_free_alien() when the platform is not numa capable. This will avoid cache misses that happen while accessing slabp (which is per page memory reference) to get nodeid. Instead use a global variable to skip the call, which is mostly likely to be present in the cache. This gives a 0.8% performance boost with the database oltp workload on a quad-core SMP platform and by any means the number is not small :) Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22IPMI: fix warning in ipmi_si_intf.cMijo Safradin
trivial change: fix warning Signed-off-by: Mijo Safradin <safradin@de.ibm.com> Acked-by: Christian Krafft <krafft@de.ibm.com> Signed-off-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22signalfd: make it group-wide, fix posix-timers schedulingOleg Nesterov
With this patch any thread can dequeue its own private signals via signalfd, even if it was created by another sub-thread. To do so, we pass "current" to dequeue_signal() if the caller is from the same thread group. This also fixes the scheduling of posix timers broken by the previous patch. If the caller doesn't belong to this thread group, we can't handle __SI_TIMER case properly anyway. Perhaps we should forbid the cross-process signalfd usage and convert ctx->tsk to ctx->sighand. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Cc: Roland McGrath <roland@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22signalfd: fix interaction with posix-timersOleg Nesterov
dequeue_signal: if (__SI_TIMER) { spin_unlock(&tsk->sighand->siglock); do_schedule_next_timer(info); spin_lock(&tsk->sighand->siglock); } Unless tsk == curent, this is absolutely unsafe: nothing prevents tsk from exiting. If signalfd was passed to another process, do_schedule_next_timer() is just wrong. Add yet another "tsk == current" check into dequeue_signal(). This patch fixes an oopsable bug, but breaks the scheduling of posix timers if the shared __SI_TIMER signal was fetched via signalfd attached to another sub-thread. Mostly fixed by the next patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Cc: Roland McGrath <roland@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22posix-timers: fix creation raceOleg Nesterov
sys_timer_create() sets ->it_process and unlocks ->siglock, then checks tmr->it_sigev_notify to define if get_task_struct() is needed. We already passed ->it_id to the caller, another thread can delete this timer and free its memory in between. As a minimal fix, move this code under ->siglock, sys_timer_delete() takes it too before calling release_posix_timer(). A proper serialization would be to take ->it_lock, we add a partly initialized timer on posix_timers_id, not good. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22posix-timers: fix deletion raceThomas Gleixner
timer_delete does: lock_timer(); timer->it_process = NULL; unlock_timer(); release_posix_timer(); timer->it_process is checked in lock_timer() to prevent access to a timer, which is on the way to be deleted, but the check happens after idr_lock is dropped. This allows release_posix_timer() to delete the timer before the lock code can check the timer: CPU 0 CPU 1 lock_timer(); timer->it_process = NULL; unlock_timer(); lock_timer() spin_lock(idr_lock); timer = idr_find(); spin_lock(timer->lock); spin_unlock(idr_lock); release_posix_timer(); spin_lock(idr_lock); idr_remove(timer); spin_unlock(idr_lock); free_timer(timer); if (timer->......) Change the locking to prevent this. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22Introduce CONFIG_CHECK_SIGNATUREGeert Uytterhoeven
Introduce CONFIG_CHECK_SIGNATURE to control inclusion of check_signature() and avoid problems on platforms that don't have readb(). Let the few legacy (ISA || PCI || X86) drivers that need check_signature() select CONFIG_CHECK_SIGNATURE. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22m68k/mac: Make mac_hid_mouse_emulate_buttons() declaration visibleGeert Uytterhoeven
m68k/mac: Make mac_hid_mouse_emulate_buttons() declaration visible drivers/char/keyboard.c: In function 'kbd_keycode': drivers/char/keyboard.c:1142: error: implicit declaration of function 'mac_hid_mouse_emulate_buttons' The forward declaration of mac_hid_mouse_emulate_buttons() is not visible on m68k because it's hidden in the middle of a big #ifdef block. Move it to <linux/kbd_kern.h>, correct the type of the second parameter, and include <linux/kbd_kern.h> where needed. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-22zorro: Make sysfs config attribute read-onlyGeert Uytterhoeven
zorro: Make the sysfs `config' attribute read-only, as you cannot write to it (there's no .write function neither). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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