kernel.git/mm/slob.c, branch linux-3.6.y

slob: Fix early boot kernel crash

2012-07-12T07:13:22Z

Commit fd3142a59af2012a7c5dc72ec97a4935ff1c5fc6 broke slob since a piece of a change for a later patch slipped into it. Fengguang Wu writes: The commit crashes the kernel w/o any dmesg output (the attached one is created by the script as a summary for that run). This is very reproducible in kvm for the attached config. Reported-by: Fengguang Wu Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

mm, sl[aou]b: Common definition for boot state of the slab allocators

2012-07-09T09:13:35Z

All allocators have some sort of support for the bootstrap status. Setup a common definition for the boot states and make all slab allocators use that definition. Reviewed-by: Glauber Costa Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

mm, sl[aou]b: Extract common code for kmem_cache_create()

2012-07-09T09:13:30Z

Kmem_cache_create() does a variety of sanity checks but those vary depending on the allocator. Use the strictest tests and put them into a slab_common file. Make the tests conditional on CONFIG_DEBUG_VM. This patch has the effect of adding sanity checks for SLUB and SLOB under CONFIG_DEBUG_VM and removes the checks in SLAB for !CONFIG_DEBUG_VM. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

mm, sl[aou]b: Extract common fields from struct kmem_cache

2012-06-14T06:20:16Z

Define a struct that describes common fields used in all slab allocators. A slab allocator either uses the common definition (like SLOB) or is required to provide members of kmem_cache with the definition given. After that it will be possible to share code that only operates on those fields of kmem_cache. The patch basically takes the slob definition of kmem cache and uses the field namees for the other allocators. It also standardizes the names used for basic object lengths in allocators: object_size Struct size specified at kmem_cache_create. Basically the payload expected to be used by the subsystem. size The size of memory allocator for each object. This size is larger than object_size and includes padding, alignment and extra metadata for each object (f.e. for debugging and rcu). Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

slob: Remove various small accessors

2012-06-14T06:19:52Z

Those have become so simple that they are no longer needed. Reviewed-by: Joonsoo Kim Acked-by: David Rientjes signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

slob: No need to zero mapping since it is no longer in use

2012-06-14T06:19:50Z

Reviewed-by: Joonsoo Kim Acked-by: David Rientjes Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

slob: Define page struct fields used in mm_types.h

2012-06-14T06:19:47Z

Define the fields used by slob in mm_types.h and use struct page instead of struct slob_page in slob. This cleans up numerous of typecasts in slob.c and makes readers aware of slob's use of page struct fields. [Also cleans up some bitrot in slob.c. The page struct field layout in slob.c is an old layout and does not match the one in mm_types.h] Reviewed-by: Glauber Costa Acked-by: David Rientjes Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg

mm: Map most files to use export.h instead of module.h

2011-10-31T13:20:12Z

The files changed within are only using the EXPORT_SYMBOL macro variants. They are not using core modular infrastructure and hence don't need module.h but only the export.h header. Signed-off-by: Paul Gortmaker

atomic: use

2011-07-26T23:49:47Z

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

slob/lockdep: Fix gfp flags passed to lockdep

2011-06-07T18:38:07Z

Doing a ktest.pl randconfig, I stumbled across the following bug on boot up: ------------[ cut here ]------------ WARNING: at /home/rostedt/work/autotest/nobackup/linux-test.git/kernel/lockdep.c:2649 lockdep_trace_alloc+0xed/0x100() Hardware name: Modules linked in: Pid: 0, comm: swapper Not tainted 3.0.0-rc1-test-00054-g1d68b67 #1 Call Trace: [] warn_slowpath_common+0xad/0xf0 [] warn_slowpath_null+0x1a/0x20 [] lockdep_trace_alloc+0xed/0x100 [] __kmalloc_node+0x30/0x2f0 [] pcpu_mem_alloc+0x13a/0x180 [] percpu_init_late+0x48/0xc2 [] ? mem_init+0xd8/0xe3 [] start_kernel+0x1c2/0x449 [] x86_64_start_reservations+0x163/0x167 [] x86_64_start_kernel+0x133/0x142^M ---[ end trace a7919e7f17c0a725 ]--- Then I ran a ktest.pl config_bisect and it came up with this config as the problem: CONFIG_SLOB Looking at what is different between SLOB and SLAB and SLUB, I found that the gfp flags are masked against gfp_allowed_mask in SLAB and SLUB, but not SLOB. On boot up, interrupts are disabled and lockdep will warn if some flags are set in gfp and interrupts are disabled. But these flags are masked off with the gfp_allowed_mask during boot. Because SLOB does not mask the flags against gfp_allowed_mask it triggers the warn on. Adding this mask fixes the bug. I also found that kmem_cache_alloc_node() was missing both the mask and the lockdep check, and that was added too. Acked-by: Matt Mackall Cc: Paul Mundt Cc: Nick Piggin Signed-off-by: Steven Rostedt Signed-off-by: Pekka Enberg