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[PATCH] Hugepages need clear_user_highpage() not clear_highpage()

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When hugepages are newly allocated to a file in mm/hugetlb.c, we clear them
with a call to clear_highpage() on each of the subpages.  We should be
using clear_user_highpage(): on powerpc, at least, clear_highpage() doesn't
correctly mark the page as icache dirty so if the page is executed shortly
after it's possible to get strange results.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Gibson 2006-02-07 12:58:25 -08:00 committed by Linus Torvalds
parent 488fc08d91
commit a2dfef6947
1 changed files with 1 additions and 1 deletions
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mm/hugetlb.c
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@ -107,7 +107,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr)
set_page_count(page, 1);
page[1].mapping = (void *)free_huge_page;
for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
clear_highpage(&page[i]);
clear_user_highpage(&page[i], addr);
return page;
}