Received-SPF: pass (google.com: domain of linux-kernel+bounces-18127-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
From: Breno Leitao <leitao@debian.org>
To: "David S. Miller" <davem@davemloft.net>,
	David Ahern <dsahern@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>
Cc: leit@meta.com,
	netdev@vger.kernel.org (open list:NETWORKING [IPv4/IPv6]),
	linux-kernel@vger.kernel.org (open list),
	llvm@lists.linux.dev (open list:CLANG/LLVM BUILD SUPPORT:Keyword:\b(?i:clang|llvm)\b)
Subject: [PATCH net-next] net/ipv6: resolve warning in ip6_fib.c
Date: Fri,  5 Jan 2024 09:39:20 -0800
Message-Id: <20240105173920.1041474-1-leitao@debian.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

In some configurations, the 'iter' variable in function
fib6_repair_tree() is unused, resulting the following warning when
compiled with W=1.

	net/ipv6/ip6_fib.c:1781:6: warning: variable 'iter' set but not used [-Wunused-but-set-variable]
	 1781 |         int iter = 0;
	      |             ^

Rewrite RT6_TRACE() macro to keep the variable in scope.

Clang 18 removes the trace completely from the binary when the trace is
disabled[1], so, no overhead is expected with this change.

[1] Link: https://paste.debian.net/1303162/

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 include/net/ip6_fib.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 9ba6413fd2e3..d2ef60ebeb25 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -30,11 +30,7 @@
 
 #define RT6_DEBUG 2
 
-#if RT6_DEBUG >= 3
-#define RT6_TRACE(x...) pr_debug(x)
-#else
-#define RT6_TRACE(x...) do { ; } while (0)
-#endif
+#define RT6_TRACE(x...) do { if (RT6_DEBUG > 3) pr_debug(x); } while (0)
 
 struct rt6_info;
 struct fib6_info;
-- 
2.39.3