• Nick Piggin's avatar
    [PATCH] mm: compound release fix · 8519fb30
    Nick Piggin authored
    Compound pages on SMP systems can now often be freed from pagetables via
    the release_pages path.  This uses put_page_testzero which does not handle
    compound pages at all.  Releasing constituent pages from process mappings
    decrements their count to a large negative number and leaks the reference
    at the head page - net result is a memory leak.
    
    The problem was hidden because the debug check in put_page_testzero itself
    actually did take compound pages into consideration.
    
    Fix the bug and the debug check.
    Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
    Acked-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    8519fb30
Name
Last commit
Last update
..
Kconfig Loading commit data...
Makefile Loading commit data...
bootmem.c Loading commit data...
fadvise.c Loading commit data...
filemap.c Loading commit data...
filemap.h Loading commit data...
filemap_xip.c Loading commit data...
fremap.c Loading commit data...
highmem.c Loading commit data...
hugetlb.c Loading commit data...
internal.h Loading commit data...
madvise.c Loading commit data...
memory.c Loading commit data...
memory_hotplug.c Loading commit data...
mempolicy.c Loading commit data...
mempool.c Loading commit data...
mincore.c Loading commit data...
mlock.c Loading commit data...
mmap.c Loading commit data...
mprotect.c Loading commit data...
mremap.c Loading commit data...
msync.c Loading commit data...
nommu.c Loading commit data...
oom_kill.c Loading commit data...
page-writeback.c Loading commit data...
page_alloc.c Loading commit data...
page_io.c Loading commit data...
pdflush.c Loading commit data...
prio_tree.c Loading commit data...
readahead.c Loading commit data...
rmap.c Loading commit data...
shmem.c Loading commit data...
slab.c Loading commit data...
slob.c Loading commit data...
sparse.c Loading commit data...
swap.c Loading commit data...
swap_state.c Loading commit data...
swapfile.c Loading commit data...
thrash.c Loading commit data...
tiny-shmem.c Loading commit data...
truncate.c Loading commit data...
util.c Loading commit data...
vmalloc.c Loading commit data...
vmscan.c Loading commit data...