Commit a2dfef69 authored Feb 07, 2006 by David Gibson Committed by Linus Torvalds Feb 07, 2006

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



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>

parent 488fc08d

mm/hugetlb.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}