[PATCH 3/3] mm/swapfile.c: count won't be bigger than SWAP_MAP_MAX

[Wei Yang]

When the condition is true, there are two possibilities:

   1. count == SWAP_MAP_BAD
   2. count == (SWAP_MAP_MAX & COUNT_CONTINUED) == SWAP_MAP_SHMEM

The first case would be filtered by the first if in __swap_duplicate().

And the second case means this swap entry is for shmem. Since we never
do another duplication for shmem swap entry. This won't happen neither.

Signed-off-by: Wei Yang <richard.weiy...@gmail.com>
---
 mm/swapfile.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1a877d1d40e3..88dd2ad34aad 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3404,8 +3404,6 @@ static int __swap_duplicate(swp_entry_t entry, unsigned 
char usage)
 
                if ((count & ~COUNT_CONTINUED) < SWAP_MAP_MAX)
                        count += usage;
-               else if ((count & ~COUNT_CONTINUED) > SWAP_MAP_MAX)
-                       err = -EINVAL;
                else if (swap_count_continued(p, offset, count))
                        count = COUNT_CONTINUED;
                else
-- 
2.23.0