[PATCH] mm/vmscan: fix unsequenced modification and access warning

[Nick Desaulniers]

Clang flags this file with the -Wunsequenced error that GCC does not
have.

unsequenced modification and access to 'gfp_mask'

It seems that gfp_mask is both read and written without a sequence point
in between, which is undefined behavior.

Signed-off-by: Nick Desaulniers <nick.desaulni...@gmail.com>
---
 mm/vmscan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4e7ed65842af..74785908822c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2958,7 +2958,7 @@ unsigned long try_to_free_pages(struct zonelist 
*zonelist, int order,
        unsigned long nr_reclaimed;
        struct scan_control sc = {
                .nr_to_reclaim = SWAP_CLUSTER_MAX,
-               .gfp_mask = (gfp_mask = current_gfp_context(gfp_mask)),
+               .gfp_mask = current_gfp_context(gfp_mask),
                .reclaim_idx = gfp_zone(gfp_mask),
                .order = order,
                .nodemask = nodemask,
@@ -2968,6 +2968,8 @@ unsigned long try_to_free_pages(struct zonelist 
*zonelist, int order,
                .may_swap = 1,
        };
 
+       gfp_mask = sc.gfp_mask;
+
        /*
         * Do not enter reclaim if fatal signal was delivered while throttled.
         * 1 is returned so that the page allocator does not OOM kill at this
-- 
2.11.0