https://github.com/torvalds/linux
Somehow I imagined that calling a NULL destructor would free a compound page rather than oopsing. No, we must supply a default destructor, __free_pages_ok using the order noted by prep_compound_page. hugetlb can still replace this as before with its own free_huge_page pointer. The case that needs this is not common: rarely does put_compound_page's put_page_testzero bring the count down to 0. But if get_user_pages is applied to some part of a compound page, without immediate release (e.g. AIO or Infiniband), then it's possible for its put_page to come after the containing vma has been unmapped and the driver done its free_pages. That's just the kind of case compound pages are supposed to be guarding against (but Nick points out, nor did PageReserved handle this right). Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Makefile | -rw-r--r-- | 237 bytes |
compat.c | -rw-r--r-- | 17.3 KB |
compat_mq.c | -rw-r--r-- | 4.0 KB |
mqueue.c | -rw-r--r-- | 29.2 KB |
msg.c | -rw-r--r-- | 18.4 KB |
msgutil.c | -rw-r--r-- | 2.4 KB |
sem.c | -rw-r--r-- | 32.9 KB |
shm.c | -rw-r--r-- | 21.1 KB |
util.c | -rw-r--r-- | 16.9 KB |
util.h | -rw-r--r-- | 2.6 KB |
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