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authorAdam Litke <agl@us.ibm.com>2007-10-16 01:26:25 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:03 -0700
commitaf767cbdd78f293485c294113885d95e7f1da123 (patch)
tree934d5c6180e808ee2062d8d2ef2ed758c452286d /mm/hugetlb.c
parent63b4613c3f0d4b724ba259dc6c201bb68b884e1a (diff)
downloadop-kernel-dev-af767cbdd78f293485c294113885d95e7f1da123.zip
op-kernel-dev-af767cbdd78f293485c294113885d95e7f1da123.tar.gz
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>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 82efecb..ae2959b 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;
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