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KAMEZAWA Hiroyuki e36e20486e mm: fix is_mem_section_removable() page_order BUG_ON check 
commit 572438f9b5 upstream.

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-12-09 13:26:40 -08:00
..
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 bounce: call flush_dcache_page() after bounce_copy_vec() 2010-09-20 13:17:54 -07:00
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 mm: fix is_mem_section_removable() page_order BUG_ON check 2010-12-09 13:26:40 -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 guard page for stacks that grow upwards 2010-09-26 17:21:34 -07:00
memory_hotplug.c mm: fix return value of scan_lru_pages in memory unplug 2010-12-09 13:26:40 -08:00
mempolicy.c numa: fix slab_node(MPOL_BIND) 2010-12-09 13:26:39 -08:00
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: Move vma_stack_continue into mm.h 2010-10-28 21:44:18 -07:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c guard page for stacks that grow upwards 2010-09-26 17:21:34 -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 mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake 2010-09-26 17:21:34 -07:00
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: page allocator: update free page counters after pages are placed on the free list 2010-09-26 17:21:34 -07:00
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: fix pcpu_last_unit_cpu 2010-09-26 17:21:27 -07:00
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, x86: Saving vmcore with non-lazy freeing of vmas 2010-11-22 10:47:31 -08:00
vmscan.c vmscan: raise the bar to PAGEOUT_IO_SYNC stalls 2010-08-26 16:41:53 -07:00
vmstat.c mm: page allocator: calculate a better estimate of NR_FREE_PAGES when memory is low and kswapd is awake 2010-09-26 17:21:34 -07:00