From 26da35010c6d6ce317d511c8186585bdd8ab6629 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Tue, 29 May 2018 09:40:11 -0500
Subject: [PATCH] signal/sh: Stop gcc warning about an impossible case in
do_divide_error
Geert Uytterhoeven <geert@linux-m68k.org> reported:
> HOSTLD scripts/mod/modpost
> CC arch/sh/kernel/traps_32.o
> arch/sh/kernel/traps_32.c: In function 'do_divide_error':
> arch/sh/kernel/traps_32.c:606:17: error: 'code' may be used uninitialized in this function [-Werror=uninitialized]
> cc1: all warnings being treated as errors
It is clear from inspection that do_divide_error is only called with
TRAP_DIVZERO_ERROR or TRAP_DIVOVF_ERROR, as that is the way
set_exception_table_vec is called. So let gcc know the other cases
should not be considered by returning in all other cases.
This removes the warning and let's the code continue to build.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: c65626c0cd4d ("signal/sh: Use force_sig_fault where appropriate")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/sh/kernel/traps_32.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 660a4bc17698..60709ad17fc7 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -602,6 +602,9 @@ asmlinkage void do_divide_error(unsigned long r4)
case TRAP_DIVOVF_ERROR:
code = FPE_INTOVF;
break;
+ default:
+ /* Let gcc know unhandled cases don't make it past here */
+ return;
}
force_sig_fault(SIGFPE, code, NULL, current);
}