Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Igor Stoppa <igor.stoppa@gmail.com>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     igor.stoppa@gmail.com, Igor Stoppa <igor.stoppa@huawei.com>,
        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] asm-generic: bug: unify hints for BUG_ON()
Date:   Tue, 11 Sep 2018 15:19:15 +0300
Message-Id: <20180911121915.30236-1-igor.stoppa@huawei.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

If BUG_ON() is used instead of BUG(), it means that probably the
preferred outcome is to not BUG(), therefore the condition tested should
be unlikely().

However, when CONFIG_PROFILE_ANNOTATED_BRANCHES is enabled, the hint is
disabled, to avoid generating false-positive warnings caused by
-Wmaybe-uninitialized.

Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 include/asm-generic/bug.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 20561a60db9c..b91273c36baf 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -58,8 +58,12 @@ struct bug_entry {
 #endif
 
 #ifndef HAVE_ARCH_BUG_ON
+#ifdef CONFIG_PROFILE_ANNOTATED_BRANCHES
+#define BUG_ON(condition) do { if (condition) BUG(); } while (0)
+#else
 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
 #endif
+#endif
 
 #ifdef __WARN_FLAGS
 #define __WARN_TAINT(taint)		__WARN_FLAGS(BUGFLAG_TAINT(taint))
@@ -183,7 +187,11 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 #endif
 
 #ifndef HAVE_ARCH_BUG_ON
+#ifdef CONFIG_PROFILE_ANNOTATED_BRANCHES
 #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
+#else
+#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
+#endif
 #endif
 
 #ifndef HAVE_ARCH_WARN_ON
-- 
2.17.1