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[PATCH] hugetlb: add comment explaining reasons for Bus Errors

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I just spent some time researching a Bus Error.  Turns out that the huge
page fault handler can return VM_FAULT_SIGBUS for various conditions where
no huge page is available.

Add a note explaining the reasoning in the source.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-02-04 23:27:55 -08:00 committed by Linus Torvalds
parent fe1dcbc4f3
commit 64b4a954b0
1 changed files with 9 additions and 0 deletions
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9
mm/hugetlb.c
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@ -444,6 +444,15 @@ retry:
page = alloc_huge_page(vma, address);
if (!page) {
hugetlb_put_quota(mapping);
/*
* No huge pages available. So this is an OOM
* condition but we do not want to trigger the OOM
* killer, so we return VM_FAULT_SIGBUS.
*
* A program using hugepages may fault with Bus Error
* because no huge pages are available in the cpuset, per
* memory policy or because all are in use!
*/
goto out;
}