* [PATCH] sh: bug: add unreachable() to silence warnings
@ 2014-08-07 1:42 Nick Krause
2014-08-07 5:10 ` Josh Triplett
0 siblings, 1 reply; 2+ messages in thread
From: Nick Krause @ 2014-08-07 1:42 UTC (permalink / raw)
To: Magnus Damm, Geert Uytterhoeven, Simon Horman,
GitAuthor: Nick Krause, open list:SUPERH, open list
Cc: josh
SuperH BUG() have warnings like
kernel/sched/core.c:2692:1: warning: control reaches end of non-void function
[-Wreturn-type]
net/core/ethtool.c:236:1: warning: control reaches end of non-void function
[-Wreturn-type]
Other BUG() implementations
have added unreachable() at end becuase of which I guess
it does not showthese errors. We can silence them using unreachable().
Signed-off-by: Nick Krause <xerofoify@gmail.com>
---
arch/sh/include/asm/bug.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/sh/include/asm/bug.h b/arch/sh/include/asm/bug.h
index dcf2780..1ae948f 100644
--- a/arch/sh/include/asm/bug.h
+++ b/arch/sh/include/asm/bug.h
@@ -48,6 +48,7 @@ do { \
"i" (__FILE__), \
"i" (__LINE__), "i" (0), \
"i" (sizeof(struct bug_entry))); \
+ unreachable(); \
} while (0)
#define __WARN_TAINT(taint) \
--
2.0.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] sh: bug: add unreachable() to silence warnings
2014-08-07 1:42 [PATCH] sh: bug: add unreachable() to silence warnings Nick Krause
@ 2014-08-07 5:10 ` Josh Triplett
0 siblings, 0 replies; 2+ messages in thread
From: Josh Triplett @ 2014-08-07 5:10 UTC (permalink / raw)
To: Nick Krause
Cc: Magnus Damm, Geert Uytterhoeven, Simon Horman, open list:SUPERH,
open list
On Thu, Aug 07, 2014 at 03:42:20AM +0200, Nick Krause wrote:
> SuperH BUG() have warnings like
>
> kernel/sched/core.c:2692:1: warning: control reaches end of non-void function
> [-Wreturn-type]
> net/core/ethtool.c:236:1: warning: control reaches end of non-void function
> [-Wreturn-type]
>
> Other BUG() implementations
> have added unreachable() at end becuase of which I guess
> it does not showthese errors. We can silence them using unreachable().
>
> Signed-off-by: Nick Krause <xerofoify@gmail.com>
This change seems reasonable to me. Unlike the generic version of
BUG(), this one doesn't call panic() or anything else flagged as
__noreturn, so it seems reasonable to add a call to unreachable() here
to tell the compiler that the assembly will trap and not return.
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
> arch/sh/include/asm/bug.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/sh/include/asm/bug.h b/arch/sh/include/asm/bug.h
> index dcf2780..1ae948f 100644
> --- a/arch/sh/include/asm/bug.h
> +++ b/arch/sh/include/asm/bug.h
> @@ -48,6 +48,7 @@ do { \
> "i" (__FILE__), \
> "i" (__LINE__), "i" (0), \
> "i" (sizeof(struct bug_entry))); \
> + unreachable(); \
> } while (0)
>
> #define __WARN_TAINT(taint) \
> --
> 2.0.1
>
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2014-08-07 5:10 ` Josh Triplett
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