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| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-02-23 01:35:25 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 02:50:20 +0100 |
| commit | d29bb9782d22063892e28716cdb76a87d2876ddb (patch) | |
| tree | 48c533b522cf65528c14ecfd2e7de7760badb192 /mm/page_alloc.c | |
| parent | mm: add zone_is_empty() and zone_is_initialized() (diff) | |
| download | linux-d29bb9782d22063892e28716cdb76a87d2876ddb.tar.xz linux-d29bb9782d22063892e28716cdb76a87d2876ddb.zip | |
mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized.
Freeing pages to uninitialized zones is not handled by
__free_one_page(), and should never happen when the code is correct.
Ran into this while writing some code that dynamically onlines extra
zones.
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Hansen <dave@linux.vnet.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | mm/page_alloc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a3687afc5917..9614aabee8c5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -538,6 +538,8 @@ static inline void __free_one_page(struct page *page, unsigned long uninitialized_var(buddy_idx); struct page *buddy; + VM_BUG_ON(!zone_is_initialized(zone)); + if (unlikely(PageCompound(page))) if (unlikely(destroy_compound_page(page, order))) return; |