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| author | Huang Ying <ying.huang@intel.com> | 2018-08-21 21:52:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-22 10:52:43 -0700 |
| commit | afa4711ef1399beb60964dcb2cd0369dfb0ac20a (patch) | |
| tree | 437ec2013e08f5be2e15fa4ac61a61896b7739d0 /mm/swapfile.c | |
| parent | fe5266d5d5948abc6e71cdabb98e3f5cba811205 (diff) | |
| download | linux-afa4711ef1399beb60964dcb2cd0369dfb0ac20a.tar.gz linux-afa4711ef1399beb60964dcb2cd0369dfb0ac20a.tar.bz2 linux-afa4711ef1399beb60964dcb2cd0369dfb0ac20a.zip | |
mm/swapfile.c: use swap_count() in swap_page_trans_huge_swapped()
In swap_page_trans_huge_swapped(), to identify whether there's any page
table mapping for a 4k sized swap entry, "si->swap_map[i] !=
SWAP_HAS_CACHE" is used. This works correctly now, because all users of
the function will only call it after checking SWAP_HAS_CACHE. But as
pointed out by Daniel, it is better to use "swap_count(map[i])" here,
because it works for "map[i] == 0" case too.
And this makes the implementation more consistent between normal and
huge swap entry.
Link: http://lkml.kernel.org/r/20180720071845.17920-4-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Suggested-and-reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 618358ad464b..c291400c4463 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1429,12 +1429,12 @@ static bool swap_page_trans_huge_swapped(struct swap_info_struct *si, ci = lock_cluster_or_swap_info(si, offset); if (!ci || !cluster_is_huge(ci)) { - if (map[roffset] != SWAP_HAS_CACHE) + if (swap_count(map[roffset])) ret = true; goto unlock_out; } for (i = 0; i < SWAPFILE_CLUSTER; i++) { - if (map[offset + i] != SWAP_HAS_CACHE) { + if (swap_count(map[offset + i])) { ret = true; break; } |