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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>
This commit is contained in:
Adam Litke 2007-10-16 01:26:25 -07:00 committed by Linus Torvalds
parent 63b4613c3f
commit af767cbdd7
1 changed files with 11 additions and 2 deletions
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13
mm/hugetlb.c
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@ -302,8 +302,17 @@ static int gather_surplus_pages(int delta)
list_del(&page->lru); list_del(&page->lru);
if ((--needed) >= 0) if ((--needed) >= 0)
enqueue_huge_page(page); enqueue_huge_page(page);
else else {
update_and_free_page(page); /*
* 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; return ret;