| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.2 175/249] xsk: Properly terminate assignment in xskq_produce_flush_desc | Date | Mon, 15 Jul 2019 09:45:40 -0400 |
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From: Nathan Chancellor <natechancellor@gmail.com>
[ Upstream commit f7019b7b0ad14bde732b8953161994edfc384953 ]
Clang warns:
In file included from net/xdp/xsk_queue.c:10: net/xdp/xsk_queue.h:292:2: warning: expression result unused [-Wunused-value] WRITE_ONCE(q->ring->producer, q->prod_tail); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:284:6: note: expanded from macro 'WRITE_ONCE' __u.__val; \ ~~~ ^~~~~ 1 warning generated.
The q->prod_tail assignment has a comma at the end, not a semi-colon. Fix that so clang no longer warns and everything works as expected.
Fixes: c497176cb2e4 ("xsk: add Rx receive functions and poll support") Link: https://github.com/ClangBuiltLinux/linux/issues/544 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Acked-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Acked-by: Björn Töpel <bjorn.topel@intel.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/xdp/xsk_queue.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 88b9ae24658d..cba4a640d5e8 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -288,7 +288,7 @@ static inline void xskq_produce_flush_desc(struct xsk_queue *q) /* Order producer and data */ smp_wmb(); /* B, matches C */ - q->prod_tail = q->prod_head, + q->prod_tail = q->prod_head; WRITE_ONCE(q->ring->producer, q->prod_tail); } -- 2.20.1
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