mm/swapfile.c: simplify the calculation of n_goal

Use min3() to simplify the comparison and make it more self-explaining.

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: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/r/20200325220309.9803-1-richard.weiyang@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index f3af990..f3b0a2c 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -994,11 +994,7 @@ int get_swap_pages(int n_goal, swp_entry_t swp_entries[], int entry_size)
        if (avail_pgs <= 0)
                goto noswap;
 
-       if (n_goal > SWAP_BATCH)
-               n_goal = SWAP_BATCH;
-
-       if (n_goal > avail_pgs)
-               n_goal = avail_pgs;
+       n_goal = min3((long)n_goal, (long)SWAP_BATCH, avail_pgs);
 
        atomic_long_sub(n_goal * size, &nr_swap_pages);