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| author | Ingo Molnar <mingo@kernel.org> | 2016-06-14 11:04:13 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-14 11:04:13 +0200 |
| commit | 07f9f22087a94e8162f77ee997c52a23f158aee8 (patch) | |
| tree | 04bfe0395c6aa95bae5c6983c3433d9ac8eb7731 /mm/fadvise.c | |
| parent | 03c041c5bf6ed584dff36b7cd509e0146a124277 (diff) | |
| parent | b7fa30c9cc48c4f55663420472505d3b4f6e1705 (diff) | |
Merge branch 'sched/urgent' into sched/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/fadvise.c')
| -rw-r--r-- | mm/fadvise.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c index b8024fa7101d..6c707bfe02fd 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -126,6 +126,17 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice) */ start_index = (offset+(PAGE_SIZE-1)) >> PAGE_SHIFT; end_index = (endbyte >> PAGE_SHIFT); + if ((endbyte & ~PAGE_MASK) != ~PAGE_MASK) { + /* First page is tricky as 0 - 1 = -1, but pgoff_t + * is unsigned, so the end_index >= start_index + * check below would be true and we'll discard the whole + * file cache which is not what was asked. + */ + if (end_index == 0) + break; + + end_index--; + } if (end_index >= start_index) { unsigned long count = invalidate_mapping_pages(mapping, |