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| author | Wei Yang <richard.weiyang@gmail.com> | 2020-06-02 06:48:46 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-02 19:59:08 +0200 |
| commit | ca2c55a7371ca3db64f5ac9ed2cb998682bf6fae (patch) | |
| tree | c2b3e571986f04371390ef9cb1f731ab2d893417 /mm/swapfile.c | |
| parent | mm: swap: properly update readahead statistics in unuse_pte_range() (diff) | |
| download | linux-ca2c55a7371ca3db64f5ac9ed2cb998682bf6fae.tar.xz linux-ca2c55a7371ca3db64f5ac9ed2cb998682bf6fae.zip | |
mm/swapfile.c: offset is only used when there is more slots
scan_swap_map_slots() is used to iterate swap_map[] array for an
available swap entry. While after several optimizations, e.g. for ssd
case, the logic of this function is a little not easy to catch.
This patchset tries to clean up the logic a little:
* shows the ssd/non-ssd case is handled mutually exclusively
* remove some unnecessary goto for ssd case
This patch (of 3):
When si->cluster_nr is zero, function would reach done and return. The
increased offset would not be used any more. This means we can move the
offset increment into the if clause.
This brings a further code cleanup possibility.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/20200328060520.31449-1-richard.weiyang@gmail.com
Link: http://lkml.kernel.org/r/20200328060520.31449-2-richard.weiyang@gmail.com
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, 1 insertions, 3 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 106ff9c1a6b9..b6e68dcf7a18 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -874,11 +874,9 @@ checks: else goto done; } - /* non-ssd case */ - ++offset; /* non-ssd case, still more slots in cluster? */ - if (si->cluster_nr && !si->swap_map[offset]) { + if (si->cluster_nr && !si->swap_map[++offset]) { --si->cluster_nr; goto checks; } |