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Carsten Otte 56c1312f85 slab: fix object alignment 
commit 1ab335d8f8 upstream.

This patch fixes alignment of slab objects in case CONFIG_DEBUG_PAGEALLOC is
active.
Before this spot in kmem_cache_create, we have this situation:
- align contains the required alignment of the object
- cachep->obj_offset is 0 or equals align in case of CONFIG_DEBUG_SLAB
- size equals the size of the object, or object plus trailing redzone in case
  of CONFIG_DEBUG_SLAB

This spot tries to fill one page per object if the object is in certain size
limits, however setting obj_offset to PAGE_SIZE - size does break the object
alignment since size may not be aligned with the required alignment.
This patch simply adds an ALIGN(size, align) to the equation and fixes the
object size detection accordingly.

This code in drivers/s390/cio/qdio_setup_init has lead to incorrectly aligned
slab objects (sizeof(struct qdio_q) equals 1792):
	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
					 256, 0, NULL);

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-26 16:41:46 -07:00
..
allocpercpu.c percpu: use dynamic percpu allocator as the default percpu allocator 2009-06-24 15:13:35 +09:00
backing-dev.c Thaw refrigerated bdi flusher threads before invoking kthread_stop on them 2009-11-12 13:08:11 +01:00
bootmem.c kmemleak: Do not report alloc_bootmem blocks as leaks 2009-08-27 14:29:17 +01:00
bounce.c block: remove some includings of blktrace_api.h 2009-06-16 11:19:36 +02:00
debug-pagealloc.c generic debug pagealloc 2009-04-01 08:59:13 -07:00
dmapool.c dmapools: protect page_list walk in show_pools() 2009-06-30 18:56:00 -07:00
fadvise.c readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM 2010-03-15 08:49:37 -07:00
failslab.c kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c 2009-04-03 12:23:01 +02:00
filemap.c do_generic_file_read: clear page errors when issuing a fresh read of the page 2010-07-05 11:10:57 -07:00
filemap_xip.c const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
fremap.c Do not account for the address space used by hugetlbfs using VM_ACCOUNT 2009-02-10 10:48:42 -08:00
highmem.c highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE 2009-11-10 04:15:47 +01:00
hugetlb.c mm: hugetlb: fix clear_huge_page() 2010-07-05 11:10:42 -07:00
hwpoison-inject.c HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs 2009-09-16 11:50:17 +02:00
init-mm.c mm: consolidate init_mm definition 2009-06-16 19:47:28 -07:00
internal.h ksm: fix mlockfreed to munlocked 2010-01-06 15:05:22 -08:00
Kconfig NOMMU: Optimise away the {dac_,}mmap_min_addr tests 2010-01-06 15:04:30 -08:00
Kconfig.debug trivial: improve help text for mm debug config options 2009-09-21 15:14:57 +02:00
kmemcheck.c kmemcheck: add hooks for the page allocator 2009-06-15 15:48:33 +02:00
kmemleak-test.c percpu: clean up percpu variable definitions 2009-06-24 15:13:48 +09:00
kmemleak.c kmemleak: Check for NULL pointer returned by create_object() 2009-10-09 13:28:47 -07:00
ksm.c ksm: fix mlockfreed to munlocked 2010-01-06 15:05:22 -08:00
maccess.c [S390] maccess: add weak attribute to probe_kernel_write 2009-06-12 10:27:37 +02:00
madvise.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2009-09-24 07:53:22 -07:00
Makefile procfs: disable per-task stack usage on NOMMU 2009-09-24 17:11:24 -07:00
memcontrol.c memcg: fix prepare migration 2010-05-12 14:57:00 -07:00
memory-failure.c HWPOISON: abort on failed unmap 2010-08-13 13:20:17 -07:00
memory.c mm: make stack guard page logic use vm_prev pointer 2010-08-26 16:41:45 -07:00
memory_hotplug.c mm: allow memory hotplug and hibernation in the same kernel 2009-11-17 17:40:33 -08:00
mempolicy.c tmpfs: cleanup mpol_parse_str() 2010-04-01 15:58:27 -07:00
mempool.c mm: remove broken 'kzalloc' mempool 2009-09-22 07:17:35 -07:00
migrate.c Fix potential crash with sys_move_pages 2010-02-23 07:37:42 -08:00
mincore.c mm: hugetlb: fix hugepage memory leak in mincore() 2009-12-18 14:04:29 -08:00
mlock.c mm: make the mlock() stack guard page checks stricter 2010-08-26 16:41:44 -07:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c mm: make the vma list be doubly linked 2010-08-26 16:41:44 -07:00
mmu_context.c mm: reduce atomic use on use_mm fast path 2009-09-22 07:17:42 -07:00
mmu_notifier.c ksm: add mmu_notifier set_pte_at_notify() 2009-09-22 07:17:31 -07:00
mmzone.c [ARM] Double check memmap is actually valid with a memmap has unexpected holes V2 2009-05-18 11:22:24 +01:00
mprotect.c perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
mremap.c untangle the do_mremap() mess 2010-01-18 10:19:11 -08:00
msync.c [CVE-2009-0029] System call wrappers part 13 2009-01-14 14:15:23 +01:00
nommu.c mm: make the vma list be doubly linked 2010-08-26 16:41:44 -07:00
oom_kill.c memcg: fix oom killing a child process in an other cgroup 2010-03-15 08:49:33 -07:00
page-writeback.c writeback: account IO throttling wait as iowait 2009-10-09 12:40:42 +02:00
page_alloc.c mm: fix migratetype bug which slowed swapping 2010-02-09 04:50:49 -08:00
page_cgroup.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
page_io.c mm: remove file argument from swap_readpage() 2009-06-16 19:47:44 -07:00
page_isolation.c memory hotplug: fix page_zone() calculation in test_pages_isolated() 2008-11-06 15:41:19 -08:00
pagewalk.c mm: hugetlb: fix hugepage memory leak in walk_page_range() 2009-12-18 14:04:30 -08:00
percpu.c percpu: restructure pcpu_extend_area_map() to fix bugs and improve readability 2009-11-13 00:55:35 +09:00
prio_tree.c
quicklist.c cpumask: use new-style cpumask ops in mm/quicklist. 2009-09-24 09:34:52 +09:30
readahead.c readahead: fix NULL filp dereference 2010-04-26 07:41:19 -07:00
rmap.c mm/rmap.c: fix comment 2009-10-01 16:11:12 -07:00
shmem.c const: mark struct vm_struct_operations 2009-09-27 11:39:25 -07:00
shmem_acl.c shmfs: use 'check_acl' instead of 'permission' 2009-09-08 11:08:46 -07:00
slab.c slab: fix object alignment 2010-08-26 16:41:46 -07:00
slob.c slab: remove duplicate kmem_cache_init_late() declarations 2009-08-06 11:36:25 +03:00
slub.c mm: kmem_cache_create(): make it easier to catch NULL cache names 2009-09-22 07:17:33 -07:00
sparse-vmemmap.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
sparse.c memory hotplug: alloc page from other node in memory online 2009-09-22 07:17:26 -07:00
swap.c mm: replace various uses of num_physpages by totalram_pages 2009-09-22 07:17:38 -07:00
swap_state.c mm: add_to_swap_cache() does not return -EEXIST 2009-09-22 07:17:35 -07:00
swapfile.c mm: fix corruption of hibernation caused by reusing swap during image saving 2010-08-13 13:20:26 -07:00
thrash.c mm: pass mm to grab_swap_token 2009-06-23 12:50:05 -07:00
truncate.c vfs: Fix vmtruncate() regression 2010-01-22 15:18:41 -08:00
util.c untangle the do_mremap() mess 2010-01-18 10:19:11 -08:00
vmalloc.c mm: purge fragmented percpu vmap blocks 2010-02-09 04:50:58 -08:00
vmscan.c vmscan: do not evict inactive pages when skipping an active list scan 2010-01-06 15:05:21 -08:00
vmstat.c mm: vmstat: add isolate pages 2009-09-22 07:17:29 -07:00