linux-kernel - [PATCH V2 linux-next] scripts/coccinelle/misc/bugon.cocci: update bug

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Message-Id: <1428613084-2861-1-git-send-email-fabf@skynet.be>
Date:	Thu,  9 Apr 2015 22:58:04 +0200
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Fabian Frederick <fabf@...net.be>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>, cocci@...teme.lip6.fr
Subject: [PATCH V2 linux-next] scripts/coccinelle/misc/bugon.cocci: update bug_on conversion warning

if()/BUG conversion to BUG_ON must be avoided when there's side effect
in condition. The reason being BUG_ON won't execute the condition when CONFIG_BUG
is not defined.

Inspired-by: J. Bruce Fields <bfields@...ldses.org>
Suggested-by: Julia Lawall <Julia.Lawall@...6.fr>
Acked-by: Julia Lawall <Julia.Lawall@...6.fr>
Signed-off-by: Fabian Frederick <fabf@...net.be>
---
V2: s/condition/the condition/

 scripts/coccinelle/misc/bugon.cocci | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/coccinelle/misc/bugon.cocci b/scripts/coccinelle/misc/bugon.cocci
index 3b7eec2..27c97f1 100644
--- a/scripts/coccinelle/misc/bugon.cocci
+++ b/scripts/coccinelle/misc/bugon.cocci
@@ -57,6 +57,6 @@ coccilib.org.print_todo(p[0], "WARNING use BUG_ON")
 p << r.p;
 @@
 
-msg="WARNING: Use BUG_ON"
+msg="WARNING: Use BUG_ON instead of if condition followed by BUG.\nPlease make sure the condition has no side effects (see conditional BUG_ON definition in include/asm-generic/bug.h)"
 coccilib.report.print_report(p[0], msg)
 
-- 
1.9.1

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