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2009-06-16Merge branch 'akpm'Linus Torvalds
* akpm: (182 commits) fbdev: bf54x-lq043fb: use kzalloc over kmalloc/memset fbdev: *bfin*: fix __dev{init,exit} markings fbdev: *bfin*: drop unnecessary calls to memset fbdev: bfin-t350mcqb-fb: drop unused local variables fbdev: blackfin has __raw I/O accessors, so use them in fb.h fbdev: s1d13xxxfb: add accelerated bitblt functions tcx: use standard fields for framebuffer physical address and length fbdev: add support for handoff from firmware to hw framebuffers intelfb: fix a bug when changing video timing fbdev: use framebuffer_release() for freeing fb_info structures radeon: P2G2CLK_ALWAYS_ONb tested twice, should 2nd be P2G2CLK_DAC_ALWAYS_ONb? s3c-fb: CPUFREQ frequency scaling support s3c-fb: fix resource releasing on error during probing carminefb: fix possible access beyond end of carmine_modedb[] acornfb: remove fb_mmap function mb862xxfb: use CONFIG_OF instead of CONFIG_PPC_OF mb862xxfb: restrict compliation of platform driver to PPC Samsung SoC Framebuffer driver: add Alpha Channel support atmel-lcdc: fix pixclock upper bound detection offb: use framebuffer_alloc() to allocate fb_info struct ... Manually fix up conflicts due to kmemcheck in mm/slab.c
2009-06-16page allocator: slab: use nr_online_nodes to check for a NUMA platformMel Gorman
SLAB currently avoids checking a bitmap repeatedly by checking once and storing a flag. When the addition of nr_online_nodes as a cheaper version of num_online_nodes(), this check can be replaced by nr_online_nodes. (Christoph did a patch that this is lifted almost verbatim from) Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16page allocator: do not check NUMA node ID when the caller knows the node is ↵Mel Gorman
valid Callers of alloc_pages_node() can optionally specify -1 as a node to mean "allocate from the current node". However, a number of the callers in fast paths know for a fact their node is valid. To avoid a comparison and branch, this patch adds alloc_pages_exact_node() that only checks the nid with VM_BUG_ON(). Callers that know their node is valid are then converted. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Paul Mundt <lethal@linux-sh.org> [for the SLOB NUMA bits] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-15Merge commit 'linus/master' into HEADVegard Nossum
Conflicts: MAINTAINERS Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
2009-06-15kmemcheck: add hooks for the page allocatorVegard Nossum
This adds support for tracking the initializedness of memory that was allocated with the page allocator. Highmem requests are not tracked. Cc: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> [build fix for !CONFIG_KMEMCHECK] Signed-off-by: Ingo Molnar <mingo@elte.hu> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
2009-06-15slab: add hooks for kmemcheckPekka Enberg
We now have SLAB support for kmemcheck! This means that it doesn't matter whether one chooses SLAB or SLUB, or indeed whether Linus chooses to chuck SLAB or SLUB.. ;-) Cc: Ingo Molnar <mingo@elte.hu> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
2009-06-13slab: move struct kmem_cache to headersPekka Enberg
Move the SLAB struct kmem_cache definition to <linux/slab_def.h> like with SLUB so kmemcheck can access ->ctor and ->flags. Cc: Ingo Molnar <mingo@elte.hu> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
2009-06-12slab: setup cpu caches later on when interrupts are enabledPekka Enberg
Fixes the following boot-time warning: [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at kernel/smp.c:369 smp_call_function_many+0x56/0x1bc() [ 0.000000] Hardware name: [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30 #492 [ 0.000000] Call Trace: [ 0.000000] [<ffffffff8149e021>] ? _spin_unlock+0x4f/0x5c [ 0.000000] [<ffffffff8108f11b>] ? smp_call_function_many+0x56/0x1bc [ 0.000000] [<ffffffff81061764>] warn_slowpath_common+0x7c/0xa9 [ 0.000000] [<ffffffff810617a5>] warn_slowpath_null+0x14/0x16 [ 0.000000] [<ffffffff8108f11b>] smp_call_function_many+0x56/0x1bc [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff8108f2be>] smp_call_function+0x3d/0x68 [ 0.000000] [<ffffffff810f3e00>] ? do_ccupdate_local+0x0/0x54 [ 0.000000] [<ffffffff81066fd8>] on_each_cpu+0x31/0x7c [ 0.000000] [<ffffffff810f64f5>] do_tune_cpucache+0x119/0x454 [ 0.000000] [<ffffffff81087080>] ? lockdep_init_map+0x94/0x10b [ 0.000000] [<ffffffff818133b0>] ? kmem_cache_init+0x421/0x593 [ 0.000000] [<ffffffff810f69cf>] enable_cpucache+0x68/0xad [ 0.000000] [<ffffffff818133c3>] kmem_cache_init+0x434/0x593 [ 0.000000] [<ffffffff8180987c>] ? mem_init+0x156/0x161 [ 0.000000] [<ffffffff817f8aae>] start_kernel+0x1cc/0x3b9 [ 0.000000] [<ffffffff817f829a>] x86_64_start_reservations+0xaa/0xae [ 0.000000] [<ffffffff817f837f>] x86_64_start_kernel+0xe1/0xe8 [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-12slab,slub: don't enable interrupts during early bootPekka Enberg
As explained by Benjamin Herrenschmidt: Oh and btw, your patch alone doesn't fix powerpc, because it's missing a whole bunch of GFP_KERNEL's in the arch code... You would have to grep the entire kernel for things that check slab_is_available() and even then you'll be missing some. For example, slab_is_available() didn't always exist, and so in the early days on powerpc, we used a mem_init_done global that is set form mem_init() (not perfect but works in practice). And we still have code using that to do the test. Therefore, mask out __GFP_WAIT, __GFP_IO, and __GFP_FS in the slab allocators in early boot code to avoid enabling interrupts. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-12slab: fix gfp flag in setup_cpu_cache()Pekka Enberg
Fixes the following warning during bootup when compiling with CONFIG_SLAB: [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at kernel/lockdep.c:2282 lockdep_trace_alloc+0x91/0xb9() [ 0.000000] Hardware name: [ 0.000000] Modules linked in: [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30 #491 [ 0.000000] Call Trace: [ 0.000000] [<ffffffff81087d84>] ? lockdep_trace_alloc+0x91/0xb9 [ 0.000000] [<ffffffff81061764>] warn_slowpath_common+0x7c/0xa9 [ 0.000000] [<ffffffff810617a5>] warn_slowpath_null+0x14/0x16 [ 0.000000] [<ffffffff81087d84>] lockdep_trace_alloc+0x91/0xb9 [ 0.000000] [<ffffffff810f5b03>] kmem_cache_alloc_node_notrace+0x26/0xdf [ 0.000000] [<ffffffff81487f4e>] ? setup_cpu_cache+0x7e/0x210 [ 0.000000] [<ffffffff81487fe3>] setup_cpu_cache+0x113/0x210 [ 0.000000] [<ffffffff810f73ff>] kmem_cache_create+0x409/0x486 [ 0.000000] [<ffffffff818131c1>] kmem_cache_init+0x232/0x593 [ 0.000000] [<ffffffff8180987c>] ? mem_init+0x156/0x161 [ 0.000000] [<ffffffff817f8aae>] start_kernel+0x1cc/0x3b9 [ 0.000000] [<ffffffff817f829a>] x86_64_start_reservations+0xaa/0xae [ 0.000000] [<ffffffff817f837f>] x86_64_start_kernel+0xe1/0xe8 [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-11Merge branch 'for-linus' of git://linux-arm.org/linux-2.6Linus Torvalds
* 'for-linus' of git://linux-arm.org/linux-2.6: kmemleak: Add the corresponding MAINTAINERS entry kmemleak: Simple testing module for kmemleak kmemleak: Enable the building of the memory leak detector kmemleak: Remove some of the kmemleak false positives kmemleak: Add modules support kmemleak: Add kmemleak_alloc callback from alloc_large_system_hash kmemleak: Add the vmalloc memory allocation/freeing hooks kmemleak: Add the slub memory allocation/freeing hooks kmemleak: Add the slob memory allocation/freeing hooks kmemleak: Add the slab memory allocation/freeing hooks kmemleak: Add documentation on the memory leak detector kmemleak: Add the base support Manual conflict resolution (with the slab/earlyboot changes) in: drivers/char/vt.c init/main.c mm/slab.c
2009-06-11slab: setup allocators earlier in the boot sequencePekka Enberg
This patch makes kmalloc() available earlier in the boot sequence so we can get rid of some bootmem allocations. The bulk of the changes are due to kmem_cache_init() being called with interrupts disabled which requires some changes to allocator boostrap code. Note: 32-bit x86 does WP protect test in mem_init() so we must setup traps before we call mem_init() during boot as reported by Ingo Molnar: We have a hard crash in the WP-protect code: [ 0.000000] Checking if this processor honours the WP bit even in supervisor mode...BUG: Int 14: CR2 ffcff000 [ 0.000000] EDI 00000188 ESI 00000ac7 EBP c17eaf9c ESP c17eaf8c [ 0.000000] EBX 000014e0 EDX 0000000e ECX 01856067 EAX 00000001 [ 0.000000] err 00000003 EIP c10135b1 CS 00000060 flg 00010002 [ 0.000000] Stack: c17eafa8 c17fd410 c16747bc c17eafc4 c17fd7e5 000011fd f8616000 c18237cc [ 0.000000] 00099800 c17bb000 c17eafec c17f1668 000001c5 c17f1322 c166e039 c1822bf0 [ 0.000000] c166e033 c153a014 c18237cc 00020800 c17eaff8 c17f106a 00020800 01ba5003 [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30-tip-02161-g7a74539-dirty #52203 [ 0.000000] Call Trace: [ 0.000000] [<c15357c2>] ? printk+0x14/0x16 [ 0.000000] [<c10135b1>] ? do_test_wp_bit+0x19/0x23 [ 0.000000] [<c17fd410>] ? test_wp_bit+0x26/0x64 [ 0.000000] [<c17fd7e5>] ? mem_init+0x1ba/0x1d8 [ 0.000000] [<c17f1668>] ? start_kernel+0x164/0x2f7 [ 0.000000] [<c17f1322>] ? unknown_bootoption+0x0/0x19c [ 0.000000] [<c17f106a>] ? __init_begin+0x6a/0x6f Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by Linus Torvalds <torvalds@linux-foundation.org> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Matt Mackall <mpm@selenic.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-06-11kmemleak: Add the slab memory allocation/freeing hooksCatalin Marinas
This patch adds the callbacks to kmemleak_(alloc|free) functions from the slab allocator. The patch also adds the SLAB_NOLEAKTRACE flag to avoid recursive calls to kmemleak when it allocates its own data structures. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-04-12tracing, kmemtrace: Separate include/trace/kmemtrace.h to kmemtrace part and ↵Zhaolei
tracepoint part Impact: refactor code for future changes Current kmemtrace.h is used both as header file of kmemtrace and kmem's tracepoints definition. Tracepoints' definition file may be used by other code, and should only have definition of tracepoint. We can separate include/trace/kmemtrace.h into 2 files: include/linux/kmemtrace.h: header file for kmemtrace include/trace/kmem.h: definition of kmem tracepoints Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Acked-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <49DEE68A.5040902@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-06Merge branch 'kmemtrace-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'kmemtrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: kmemtrace: trace kfree() calls with NULL or zero-length objects kmemtrace: small cleanups kmemtrace: restore original tracing data binary format, improve ABI kmemtrace: kmemtrace_alloc() must fill type_id kmemtrace: use tracepoints kmemtrace, rcu: don't include unnecessary headers, allow kmemtrace w/ tracepoints kmemtrace, rcu: fix rcupreempt.c data structure dependencies kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_unlzma.c kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_bunzip2.c kmemtrace, kbuild: fix slab.h dependency problem in lib/decompress_inflate.c kmemtrace, squashfs: fix slab.h dependency problem in squasfs kmemtrace, befs: fix slab.h dependency problem kmemtrace, security: fix linux/key.h header file dependencies kmemtrace, fs: fix linux/fdtable.h header file dependencies kmemtrace, fs: uninline simple_transaction_set() kmemtrace, fs, security: move alloc_secdata() and free_secdata() to linux/security.h
2009-04-05Merge branch 'tracing-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (413 commits) tracing, net: fix net tree and tracing tree merge interaction tracing, powerpc: fix powerpc tree and tracing tree interaction ring-buffer: do not remove reader page from list on ring buffer free function-graph: allow unregistering twice trace: make argument 'mem' of trace_seq_putmem() const tracing: add missing 'extern' keywords to trace_output.h tracing: provide trace_seq_reserve() blktrace: print out BLK_TN_MESSAGE properly blktrace: extract duplidate code blktrace: fix memory leak when freeing struct blk_io_trace blktrace: fix blk_probes_ref chaos blktrace: make classic output more classic blktrace: fix off-by-one bug blktrace: fix the original blktrace blktrace: fix a race when creating blk_tree_root in debugfs blktrace: fix timestamp in binary output tracing, Text Edit Lock: cleanup tracing: filter fix for TRACE_EVENT_FORMAT events ftrace: Using FTRACE_WARN_ON() to check "freed record" in ftrace_release() x86: kretprobe-booster interrupt emulation code fix ... Fix up trivial conflicts in arch/parisc/include/asm/ftrace.h include/linux/memory.h kernel/extable.c kernel/module.c
2009-04-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumaskLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask: (36 commits) cpumask: remove cpumask allocation from idle_balance, fix numa, cpumask: move numa_node_id default implementation to topology.h, fix cpumask: remove cpumask allocation from idle_balance x86: cpumask: x86 mmio-mod.c use cpumask_var_t for downed_cpus x86: cpumask: update 32-bit APM not to mug current->cpus_allowed x86: microcode: cleanup x86: cpumask: use work_on_cpu in arch/x86/kernel/microcode_core.c cpumask: fix CONFIG_CPUMASK_OFFSTACK=y cpu hotunplug crash numa, cpumask: move numa_node_id default implementation to topology.h cpumask: convert node_to_cpumask_map[] to cpumask_var_t cpumask: remove x86 cpumask_t uses. cpumask: use cpumask_var_t in uv_flush_tlb_others. cpumask: remove cpumask_t assignment from vector_allocation_domain() cpumask: make Xen use the new operators. cpumask: clean up summit's send_IPI functions cpumask: use new cpumask functions throughout x86 x86: unify cpu_callin_mask/cpu_callout_mask/cpu_initialized_mask/cpu_sibling_setup_mask cpumask: convert struct cpuinfo_x86's llc_shared_map to cpumask_var_t cpumask: convert node_to_cpumask_map[] to cpumask_var_t x86: unify 32 and 64-bit node_to_cpumask_map ...
2009-04-03kmemtrace: trace kfree() calls with NULL or zero-length objectsPekka Enberg
Impact: also output kfree(NULL) entries This patch moves the trace_kfree() calls before the ZERO_OR_NULL_PTR check so that we can trace call-sites that call kfree() with NULL many times which might be an indication of a bug. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> LKML-Reference: <1237971957.30175.18.camel@penberg-laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-03kmemtrace: use tracepointsEduard - Gabriel Munteanu
kmemtrace now uses tracepoints instead of markers. We no longer need to use format specifiers to pass arguments. Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> [ folded: Use the new TP_PROTO and TP_ARGS to fix the build. ] [ folded: fix build when CONFIG_KMEMTRACE is disabled. ] [ folded: define tracepoints when CONFIG_TRACEPOINTS is enabled. ] Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> LKML-Reference: <ae61c0f37156db8ec8dc0d5778018edde60a92e3.1237813499.git.eduard.munteanu@linux360.ro> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-02workqueue: add to_delayed_work() helper functionJean Delvare
It is a fairly common operation to have a pointer to a work and to need a pointer to the delayed work it is contained in. In particular, all delayed works which want to rearm themselves will have to do that. So it would seem fair to offer a helper function for this operation. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-31Merge branch 'cpumask-for-linus' of ↵Rusty Russell
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip Conflicts: arch/x86/include/asm/topology.h drivers/oprofile/buffer_sync.c (Both cases: changed in Linus' tree, removed in Ingo's).
2009-03-30Merge branch 'locking-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (33 commits) lockdep: fix deadlock in lockdep_trace_alloc lockdep: annotate reclaim context (__GFP_NOFS), fix SLOB lockdep: annotate reclaim context (__GFP_NOFS), fix lockdep: build fix for !PROVE_LOCKING lockstat: warn about disabled lock debugging lockdep: use stringify.h lockdep: simplify check_prev_add_irq() lockdep: get_user_chars() redo lockdep: simplify get_user_chars() lockdep: add comments to mark_lock_irq() lockdep: remove macro usage from mark_held_locks() lockdep: fully reduce mark_lock_irq() lockdep: merge the !_READ mark_lock_irq() helpers lockdep: merge the _READ mark_lock_irq() helpers lockdep: simplify mark_lock_irq() helpers #3 lockdep: further simplify mark_lock_irq() helpers lockdep: simplify the mark_lock_irq() helpers lockdep: split up mark_lock_irq() lockdep: generate usage strings lockdep: generate the state bit definitions ...
2009-03-13cpumask: replace node_to_cpumask with cpumask_of_node.Rusty Russell
Impact: cleanup node_to_cpumask (and the blecherous node_to_cpumask_ptr which contained a declaration) are replaced now everyone implements cpumask_of_node. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2009-03-04Merge branch 'core/locking' into tracing/ftraceIngo Molnar
2009-02-14lockdep: annotate reclaim context (__GFP_NOFS)Nick Piggin
Here is another version, with the incremental patch rolled up, and added reclaim context annotation to kswapd, and allocation tracing to slab allocators (which may only ever reach the page allocator in rare cases, so it is good to put annotations here too). Haven't tested this version as such, but it should be getting closer to merge worthy ;) -- After noticing some code in mm/filemap.c accidentally perform a __GFP_FS allocation when it should not have been, I thought it might be a good idea to try to catch this kind of thing with lockdep. I coded up a little idea that seems to work. Unfortunately the system has to actually be in __GFP_FS page reclaim, then take the lock, before it will mark it. But at least that might still be some orders of magnitude more common (and more debuggable) than an actual deadlock condition, so we have some improvement I hope (the concept is no less complete than discovery of a lock's interrupt contexts). I guess we could even do the same thing with __GFP_IO (normal reclaim), and even GFP_NOIO locks too... but filesystems will have the most locks and fiddly code paths, so let's start there and see how it goes. It *seems* to work. I did a quick test. ================================= [ INFO: inconsistent lock state ] 2.6.28-rc6-00007-ged31348-dirty #26 --------------------------------- inconsistent {in-reclaim-W} -> {ov-reclaim-W} usage. modprobe/8526 [HC0[0]:SC0[0]:HE1:SE1] takes: (testlock){--..}, at: [<ffffffffa0020055>] brd_init+0x55/0x216 [brd] {in-reclaim-W} state was registered at: [<ffffffff80267bdb>] __lock_acquire+0x75b/0x1a60 [<ffffffff80268f71>] lock_acquire+0x91/0xc0 [<ffffffff8070f0e1>] mutex_lock_nested+0xb1/0x310 [<ffffffffa002002b>] brd_init+0x2b/0x216 [brd] [<ffffffff8020903b>] _stext+0x3b/0x170 [<ffffffff80272ebf>] sys_init_module+0xaf/0x1e0 [<ffffffff8020c3fb>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff irq event stamp: 3929 hardirqs last enabled at (3929): [<ffffffff8070f2b5>] mutex_lock_nested+0x285/0x310 hardirqs last disabled at (3928): [<ffffffff8070f089>] mutex_lock_nested+0x59/0x310 softirqs last enabled at (3732): [<ffffffff8061f623>] sk_filter+0x83/0xe0 softirqs last disabled at (3730): [<ffffffff8061f5b6>] sk_filter+0x16/0xe0 other info that might help us debug this: 1 lock held by modprobe/8526: #0: (testlock){--..}, at: [<ffffffffa0020055>] brd_init+0x55/0x216 [brd] stack backtrace: Pid: 8526, comm: modprobe Not tainted 2.6.28-rc6-00007-ged31348-dirty #26 Call Trace: [<ffffffff80265483>] print_usage_bug+0x193/0x1d0 [<ffffffff80266530>] mark_lock+0xaf0/0xca0 [<ffffffff80266735>] mark_held_locks+0x55/0xc0 [<ffffffffa0020000>] ? brd_init+0x0/0x216 [brd] [<ffffffff802667ca>] trace_reclaim_fs+0x2a/0x60 [<ffffffff80285005>] __alloc_pages_internal+0x475/0x580 [<ffffffff8070f29e>] ? mutex_lock_nested+0x26e/0x310 [<ffffffffa0020000>] ? brd_init+0x0/0x216 [brd] [<ffffffffa002006a>] brd_init+0x6a/0x216 [brd] [<ffffffffa0020000>] ? brd_init+0x0/0x216 [brd] [<ffffffff8020903b>] _stext+0x3b/0x170 [<ffffffff8070f8b9>] ? mutex_unlock+0x9/0x10 [<ffffffff8070f83d>] ? __mutex_unlock_slowpath+0x10d/0x180 [<ffffffff802669ec>] ? trace_hardirqs_on_caller+0x12c/0x190 [<ffffffff80272ebf>] sys_init_module+0xaf/0x1e0 [<ffffffff8020c3fb>] system_call_fastpath+0x16/0x1b Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-13Merge branches 'tracing/ftrace', 'tracing/ring-buffer', 'tracing/sysprof', ↵Ingo Molnar
'tracing/urgent' and 'linus' into tracing/core
2009-02-12mm: Export symbol ksize()Kirill A. Shutemov
Commit 7b2cd92adc5430b0c1adeb120971852b4ea1ab08 ("crypto: api - Fix zeroing on free") added modular user of ksize(). Export that to fix crypto.ko compilation. Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2009-01-06Merge branch 'linus' into tracing/kmemtrace2Ingo Molnar
2009-01-01cpumask: convert mm/Rusty Russell
Impact: Use new API Convert kernel mm functions to use struct cpumask. We skip include/linux/percpu.h and mm/allocpercpu.c, which are in flux. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
2008-12-31tracing/kmemtrace: fix typoIngo Molnar
Impact: build fix Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-31Merge branch 'tracing/kmemtrace' into tracing/kmemtrace2Ingo Molnar
2008-12-31Merge branch 'linus' into tracing/kmemtraceIngo Molnar
Conflicts: mm/slub.c
2008-12-30tracing/kmemtrace: export kmemtrace_mark_alloc_node() / kmemtrace_mark_free()Ingo Molnar
Impact: build fix Also fix up Kconfig dependencies and include files. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-30kmemtrace: move #include linesIngo Molnar
Impact: avoid conflicts with kmemcheck kmemcheck modifies the same area of slab.c and slub.c - move the include lines up a bit. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-29kmemtrace: SLAB hooks.Eduard - Gabriel Munteanu
This adds hooks for the SLAB allocator, to allow tracing with kmemtrace. We also convert some inline functions to __always_inline to make sure _RET_IP_, which expands to __builtin_return_address(0), always works as expected. Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-12-29SLUB: Replace __builtin_return_address(0) with _RET_IP_.Eduard - Gabriel Munteanu
This patch replaces __builtin_return_address(0) with _RET_IP_, since a previous patch moved _RET_IP_ and _THIS_IP_ to include/linux/kernel.h and they're widely available now. This makes for shorter and easier to read code. [penberg@cs.helsinki.fi: remove _RET_IP_ casts to void pointer] Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-12-29Merge branch 'topic/failslab' into for-linusPekka Enberg
Conflicts: mm/slub.c Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-12-29Merge branches 'topic/fixes', 'topic/cleanups' and 'topic/documentation' ↵Pekka Enberg
into for-linus
2008-12-29slab: remove GFP_THISNODE clearing from alloc_slabmgmt()Pekka Enberg
Commit 6cb062296f73e74768cca2f3eaf90deac54de02d ("Categorize GFP flags") left one call-site in alloc_slabmgmt() to clear GFP_THISNODE instead of GFP_CONSTRAINT_MASK. Unfortunately, that ends up clearing __GFP_NOWARN and __GFP_NORETRY as well which is not what we want. As the only caller of alloc_slabmgmt() already clears GFP_CONSTRAINT_MASK before passing local_flags to it, we can just remove the clearing of GFP_THISNODE. This patch should fix spurious page allocation failure warnings on the mempool_alloc() path. See the following URL for the original discussion of the bug: http://lkml.org/lkml/2008/10/27/100 Acked-by: Christoph Lameter <cl@linux-foundation.org> Reported-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-12-29SLUB: failslab supportAkinobu Mita
Currently fault-injection capability for SLAB allocator is only available to SLAB. This patch makes it available to SLUB, too. [penberg@cs.helsinki.fi: unify slab and slub implementations] Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-11-26slab: Update the kmem_cache_create documentation regarding the name parameterCatalin Marinas
kmem_cache implementations like slub are allowed to merge multiple caches but only the initial name is preserved. Therefore, kmem_cache_name() is not guaranteed to return the same pointer passed to the former function. This patch updates the documentation to make this clearer. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-11-26slab: unsigned slabp->inuse cannot be less than 0roel kluin
unsigned slabp->inuse cannot be less than 0 Acked-by: Christoph Lameter <cl@linux-foundation.org Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-11-26SLUB: Replace __builtin_return_address(0) with _RET_IP_.Eduard - Gabriel Munteanu
This patch replaces __builtin_return_address(0) with _RET_IP_, since a previous patch moved _RET_IP_ and _THIS_IP_ to include/linux/kernel.h and they're widely available now. This makes for shorter and easier to read code. [penberg@cs.helsinki.fi: remove _RET_IP_ casts to void pointer] Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-10-23proc: move /proc/slabinfo boilerplate to mm/slub.c, mm/slab.cAlexey Dobriyan
Lose dummy ->write hook in case of SLUB, it's possible now. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-10-23proc: move /proc/slab_allocators boilerplate to mm/slab.cAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-07-29mm: unexport ksizeAdrian Bunk
This patch removes the obsolete and no longer used exports of ksize. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-07-26SL*B: drop kmem cache argument from constructorAlexey Dobriyan
Kmem cache passed to constructor is only needed for constructors that are themselves multiplexeres. Nobody uses this "feature", nor does anybody uses passed kmem cache in non-trivial way, so pass only pointer to object. Non-trivial places are: arch/powerpc/mm/init_64.c arch/powerpc/mm/hugetlbpage.c This is flag day, yes. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Christoph Lameter <cl@linux-foundation.org> Cc: Jon Tollefson <kniht@linux.vnet.ibm.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Matt Mackall <mpm@selenic.com> [akpm@linux-foundation.org: fix arch/powerpc/mm/hugetlbpage.c] [akpm@linux-foundation.org: fix mm/slab.c] [akpm@linux-foundation.org: fix ubifs] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-15Merge branch 'generic-ipi' into generic-ipi-for-linusIngo Molnar
Conflicts: arch/powerpc/Kconfig arch/s390/kernel/time.c arch/x86/kernel/apic_32.c arch/x86/kernel/cpu/perfctr-watchdog.c arch/x86/kernel/i8259_64.c arch/x86/kernel/ldt.c arch/x86/kernel/nmi_64.c arch/x86/kernel/smpboot.c arch/x86/xen/smp.c include/asm-x86/hw_irq_32.h include/asm-x86/hw_irq_64.h include/asm-x86/mach-default/irq_vectors.h include/asm-x86/mach-voyager/irq_vectors.h include/asm-x86/smp.h kernel/Makefile Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-15slab: rename slab_destroy_objsRabin Vincent
With the removal of destructors, slab_destroy_objs no longer actually destroys any objects, making the kernel doc incorrect and the function name misleading. In keeping with the other debug functions, rename it to slab_destroy_debugcheck and drop the kernel doc. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-06-26on_each_cpu(): kill unused 'retry' parameterJens Axboe
It's not even passed on to smp_call_function() anymore, since that was removed. So kill it. Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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