[PATCH V2 linux-next] scripts/coccinelle/misc/bugon.cocci: update bug_on conversion warning

[Fabian Frederick]

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@xxxxxxxxxxxx>
Suggested-by: Julia Lawall <Julia.Lawall@xxxxxxx>
Acked-by: Julia Lawall <Julia.Lawall@xxxxxxx>
Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
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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