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author | Wanpeng Li <liwanp@linux.vnet.ibm.com> | 2013-10-01 00:45:21 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-10-01 01:31:02 +0400 |
commit | 20cb6cab52a21b46e3c0dc7bd23f004f810fb421 (patch) | |
tree | a0adabe2b403a45cdb9dcf034a1f1a01f1468168 /crypto/ansi_cprng.c | |
parent | 080506ad0aa9c9fbc7879cdd290d55624da08c60 (diff) | |
download | linux-20cb6cab52a21b46e3c0dc7bd23f004f810fb421.tar.xz |
mm/hwpoison: fix traversal of hugetlbfs pages to avoid printk flood
madvise_hwpoison won't check if the page is small page or huge page and
traverses in small page granularity against the range unconditionally,
which result in a printk flood "MCE xxx: already hardware poisoned" if
the page is a huge page.
This patch fixes it by using compound_order(compound_head(page)) for
huge page iterator.
Testcase:
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <errno.h>
#define PAGES_TO_TEST 3
#define PAGE_SIZE 4096 * 512
int main(void)
{
char *mem;
int i;
mem = mmap(NULL, PAGES_TO_TEST * PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, 0, 0);
if (madvise(mem, PAGES_TO_TEST * PAGE_SIZE, MADV_HWPOISON) == -1)
return -1;
munmap(mem, PAGES_TO_TEST * PAGE_SIZE);
return 0;
}
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/ansi_cprng.c')
0 files changed, 0 insertions, 0 deletions