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authorAndrea Arcangeli <aarcange@redhat.com>2011-02-15 19:02:45 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-15 15:21:11 -0800
commita7d6e4ecdb7648478ddec76d30d87d03d6e22b31 (patch)
tree1e0110780ac0a8eeef2629e1d5880602bd6003c0 /include/linux/huge_mm.h
parent09f586b35d8503b57de1e0e9b19bc6b38e0d7319 (diff)
thp: prevent hugepages during args/env copying into the user stack
Transparent hugepages can only be created if rmap is fully functional. So we must prevent hugepages to be created while is_vma_temporary_stack() is true. This also optmizes away some harmless but unnecessary setting of khugepaged_scan.address and it switches some BUG_ON to VM_BUG_ON. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/huge_mm.h')
-rw-r--r--include/linux/huge_mm.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 8e6c8c42bc3c..df29c8fde36b 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -57,7 +57,8 @@ extern pmd_t *page_check_address_pmd(struct page *page,
(transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
((__vma)->vm_flags & VM_HUGEPAGE))) && \
- !((__vma)->vm_flags & VM_NOHUGEPAGE))
+ !((__vma)->vm_flags & VM_NOHUGEPAGE) && \
+ !is_vma_temporary_stack(__vma))
#define transparent_hugepage_defrag(__vma) \
((transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \