From c5419e6f054c877339f754e02c3b1dafd88cd96c Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Fri, 28 Nov 2008 21:55:42 -0800 Subject: [PATCH] cxgb3: Fix sparse warning and micro-optimize is_pure_response() The function is_pure_response() does "ntohl(var) & const" and then essentially just tests whether the result is 0 or not; this can be done more efficiently by computing "var & htonl(const)" instead and doing the byte swap at compile time instead of run time. This change slightly shrinks the compiled code; eg on x86-64 we save a couple of bswapl instructions: add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8 (-8) function old new delta t3_sge_intr_msix_napi 544 536 -8 and this also has the pleasant side effect of fixing a sparse warning: drivers/net/cxgb3/sge.c:2313:15: warning: restricted degrades to integer Signed-off-by: Roland Dreier Signed-off-by: David S. Miller --- drivers/net/cxgb3/sge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c index bc6a8dcb8cce..d3a6e245f1ef 100644 --- a/drivers/net/cxgb3/sge.c +++ b/drivers/net/cxgb3/sge.c @@ -2306,7 +2306,7 @@ next_fl: static inline int is_pure_response(const struct rsp_desc *r) { - u32 n = ntohl(r->flags) & (F_RSPD_ASYNC_NOTIF | F_RSPD_IMM_DATA_VALID); + __be32 n = r->flags & htonl(F_RSPD_ASYNC_NOTIF | F_RSPD_IMM_DATA_VALID); return (n | r->len_cq) == 0; } -- 2.30.2