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| author | Adam Litke <agl@us.ibm.com> | 2007-10-16 01:26:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:03 -0700 |
| commit | af767cbdd78f293485c294113885d95e7f1da123 (patch) | |
| tree | 934d5c6180e808ee2062d8d2ef2ed758c452286d | |
| parent | 63b4613c3f0d4b724ba259dc6c201bb68b884e1a (diff) | |
| download | kernel-common-af767cbdd78f293485c294113885d95e7f1da123.tar.gz kernel-common-af767cbdd78f293485c294113885d95e7f1da123.tar.bz2 kernel-common-af767cbdd78f293485c294113885d95e7f1da123.zip | |
hugetlb: fix dynamic pool resize failure case
When gather_surplus_pages() fails to allocate enough huge pages to satisfy
the requested reservation, it frees what it did allocate back to the buddy
allocator. put_page() should be called instead of update_and_free_page()
to ensure that pool counters are updated as appropriate and the page's
refcount is decremented.
Signed-off-by: Adam Litke <agl@us.ibm.com>
Acked-by: Dave Hansen <haveblue@us.ibm.com>
Cc: David Gibson <hermes@gibson.dropbear.id.au>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Ken Chen <kenchen@google.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/hugetlb.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 82efecbab96f..ae2959bb59cb 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -302,8 +302,17 @@ free: list_del(&page->lru); if ((--needed) >= 0) enqueue_huge_page(page); - else - update_and_free_page(page); + else { + /* + * Decrement the refcount and free the page using its + * destructor. This must be done with hugetlb_lock + * unlocked which is safe because free_huge_page takes + * hugetlb_lock before deciding how to free the page. + */ + spin_unlock(&hugetlb_lock); + put_page(page); + spin_lock(&hugetlb_lock); + } } return ret; |