KAMEZAWA Hiroyuki 572438f9b5 mm: fix is_mem_section_removable() page_order BUG_ON check ...

page_order() is called by memory hotplug's user interface to check the
section is removable or not.  (is_mem_section_removable())

It calls page_order() withoug holding zone->lock.
So, even if the caller does

	if (PageBuddy(page))
		ret = page_order(page) ...
The caller may hit BUG_ON().

For fixing this, there are 2 choices.
  1. add zone->lock.
  2. remove BUG_ON().

is_mem_section_removable() is used for some "advice" and doesn't need to
be 100% accurate.  This is_removable() can be called via user program..
We don't want to take this important lock for long by user's request.  So,
this patch removes BUG_ON().

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2010-10-26 16:52:11 -07:00

..

backing-dev.c

writeback: do not sleep on the congestion queue if there are no congested BDIs or if significant congestion is not being encountered in the current zone

2010-10-26 16:52:07 -07:00

bootmem.c

x86, memblock: Replace e820_/_early string with memblock_

2010-08-27 11:13:47 -07:00

bounce.c

bounce: call flush_dcache_page() after bounce_copy_vec()

2010-09-09 18:57:25 -07:00

compaction.c

mm: compaction: handle active and inactive fairly in too_many_isolated

2010-09-09 18:57:24 -07:00

debug-pagealloc.c

…

dmapool.c

mm: add a might_sleep_if() to dma_pool_alloc()

2010-10-26 16:52:08 -07:00

fadvise.c

readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM

2010-03-06 11:26:25 -08:00

failslab.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

filemap_xip.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

filemap.c

mm: remove temporary variable on generic_file_direct_write()

2010-10-26 16:52:09 -07:00

fremap.c

Avoid pgoff overflow in remap_file_pages

2010-09-25 09:34:58 -07:00

highmem.c

mm: stack based kmap_atomic()

2010-10-26 16:52:08 -07:00

hugetlb.c

mm/hugetlb.c: add missing spin_lock() to hugetlb_cow()

2010-10-26 16:52:11 -07:00

hwpoison-inject.c

HWPOISON, hugetlb: support hwpoison injection for hugepage

2010-08-11 09:23:11 +02:00

init-mm.c

mm: provide init_mm mm_context initializer

2010-08-09 20:44:54 -07:00

internal.h

mm: fix is_mem_section_removable() page_order BUG_ON check

2010-10-26 16:52:11 -07:00

Kconfig

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2010-10-22 17:31:36 -07:00

Kconfig.debug

trivial: improve help text for mm debug config options

2009-09-21 15:14:57 +02:00

kmemcheck.c

kmemcheck: Fix build errors due to missing slab.h

2010-03-30 22:02:32 +09:00

kmemleak-test.c

…

kmemleak.c

kmemleak: Fix typo in the comment

2010-08-08 21:57:23 +01:00

ksm.c

ksm: fix bad user data when swapping

2010-10-04 11:09:53 -07:00

maccess.c

maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)

2010-01-07 11:58:36 -06:00

madvise.c

HWPOISON: Add a madvise() injector for soft page offlining

2009-12-16 12:20:00 +01:00

Makefile

percpu: use percpu allocator on UP too

2010-10-02 10:26:05 +03:00

memblock.c

memblock: Annotate memblock functions with __init_memblock

2010-10-11 16:00:52 -07:00

memcontrol.c

memcg: fix thresholds with use_hierarchy == 1

2010-10-07 13:31:21 -07:00

memory_hotplug.c

mm/memory_hotplug.c: make scan_lru_pages() static

2010-10-26 16:52:10 -07:00

memory-failure.c

mm: compaction: fix COMPACTPAGEFAILED counting

2010-10-26 16:52:06 -07:00

memory.c

mm: wrap follow_pte() using __cond_lock()

2010-10-26 16:52:09 -07:00

mempolicy.c

mm/mempolicy.c: check return code of check_range

2010-10-26 16:52:06 -07:00

mempool.c

mm: remove broken 'kzalloc' mempool

2009-09-22 07:17:35 -07:00

migrate.c

mm: fix error reporting in move_pages() syscall

2010-10-26 16:52:11 -07:00

mincore.c

mincore: do nested page table walks

2010-05-25 08:06:58 -07:00

mlock.c

mm: Move vma_stack_continue into mm.h

2010-09-09 09:05:06 -07:00

mm_init.c

…

mmap.c

mmap: call unlink_anon_vmas() in __split_vma() in case of error

2010-09-22 17:22:40 -07:00

mmu_context.c

exit: fix oops in sync_mm_rss

2010-03-24 16:31:21 -07:00

mmu_notifier.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

mmzone.c

mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake

2010-09-09 18:57:25 -07:00

mprotect.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

mremap.c

mm: remove pte_*map_nested()

2010-10-26 16:52:08 -07:00

msync.c

sanitize vfs_fsync calling conventions

2010-05-21 18:31:21 -04:00

nommu.c

mm: add vzalloc() and vzalloc_node() helpers

2010-10-26 16:52:10 -07:00

oom_kill.c

oom: kill all threads sharing oom killed task's mm

2010-10-26 16:52:05 -07:00

page_alloc.c

mm: add casts to/from gfp_t in gfp_to_alloc_flags()

2010-10-26 16:52:09 -07:00

page_cgroup.c

kmemleak: Annotate false positive in init_section_page_cgroup()

2010-07-19 11:54:14 +01:00

page_io.c

block: unify flags for struct bio and struct request

2010-08-07 18:20:39 +02:00

page_isolation.c

…

page-writeback.c

writeback: remove the internal 5% low bound on dirty_ratio

2010-10-26 16:52:08 -07:00

pagewalk.c

pagemap: fix pfn calculation for hugepage

2010-04-07 08:38:04 -07:00

percpu-km.c

percpu: clear memory allocated with the km allocator

2010-10-02 10:28:42 +03:00

percpu-vm.c

percpu: move vmalloc based chunk management into percpu-vm.c

2010-05-01 08:30:50 +02:00

percpu.c

Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2010-10-24 13:41:39 -07:00

prio_tree.c

…

quicklist.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

readahead.c

readahead.c: fix comment

2010-05-25 08:07:00 -07:00

rmap.c

rmap: make anon_vma_chain_free() static

2010-10-26 16:52:10 -07:00

shmem.c

shmem: put_super must percpu_counter_destroy

2010-08-17 18:33:11 -07:00

slab.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6

2010-08-22 10:08:52 -07:00

slob.c

slob: fix gfp flags for order-0 page allocations

2010-10-02 10:24:28 +03:00

slub.c

SLUB: Fix memory hotplug with !NUMA

2010-10-06 21:16:42 +03:00

sparse-vmemmap.c

x86: Use memblock to replace early_res

2010-08-27 11:12:29 -07:00

sparse.c

sparsemem: on no vmemmap path put mem_map on node high too

2010-05-25 08:06:56 -07:00

swap_state.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

swap.c

mm: export lru_cache_add_*() to modules

2010-05-25 15:06:06 +02:00

swapfile.c

/proc/swaps: support polling

2010-10-26 16:52:11 -07:00

thrash.c

…

truncate.c

check ATTR_SIZE contraints in inode_change_ok

2010-08-09 16:47:39 -04:00

util.c

export __get_user_pages_fast() function

2010-10-24 10:51:24 +02:00

vmalloc.c

mm: add vzalloc() and vzalloc_node() helpers

2010-10-26 16:52:10 -07:00

vmscan.c

vmscan,tmpfs: treat used once pages on tmpfs as used once

2010-10-26 16:52:08 -07:00

vmstat.c

vmstat: include compaction.h when CONFIG_COMPACTION

2010-10-26 16:52:10 -07:00