linux-kernel - [PATCH -next] signal/mips: Report FPE_FLTUNK for undiagnosed floating point exceptions

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Message-Id: <1526392247-25512-1-git-send-email-linux@roeck-us.net>
Date:   Tue, 15 May 2018 06:50:47 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     James Hogan <jhogan@...nel.org>
Cc:     linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Subject: [PATCH -next] signal/mips: Report FPE_FLTUNK for undiagnosed floating point exceptions

Most mips builds fail with

arch/mips/kernel/traps.c: In function ‘force_fcr31_sig’:
arch/mips/kernel/traps.c:732:2: error:
	‘si_code’ may be used uninitialized in this function

Fix the problem by initializing si_code with FPE_FLTUNK (undiagnosed
floating point exception).

Fixes: f43a54a0d916 ("signal/mips: Use force_sig_fault where appropriate")
Cc: linux-mips@...ux-mips.org
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
Feel free to merge into the patch introducing the problem.

 arch/mips/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 66ec4b0b484d..d67fa74622ee 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -716,7 +716,7 @@ asmlinkage void do_ov(struct pt_regs *regs)
 void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
 		     struct task_struct *tsk)
 {
-	int si_code;
+	int si_code = FPE_FLTUNK;
 
 	if (fcr31 & FPU_CSR_INV_X)
 		si_code = FPE_FLTINV;
-- 
2.7.4