From 20229305afdc0e49b3af2204ab848d6bddcb9fc3 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 8 Aug 2017 13:52:28 -0500 Subject: [PATCH] mips/signal: In force_fcr31_sig return in the impossible case In a recent discussion Maciej Rozycki reported that this case is impossible. Handle the impossible case by just returning instead of trying to handle it. This makes static analysis simpler as it means nothing needs to consider the impossible case after the return statement. As the code no longer has to deal with this case remove FPE_FIXME from the mips siginfo.h Cc: "Maciej W. Rozycki" Cc: Ralf Baechle Link: http://lkml.kernel.org/r/20170718140651.15973-4-ebiederm@xmission.com Ref: ea1b75cf9138 ("signal/mips: Document a conflict with SI_USER with SIGFPE") Signed-off-by: "Eric W. Biederman" --- arch/mips/include/uapi/asm/siginfo.h | 7 ------- arch/mips/kernel/traps.c | 2 +- 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/arch/mips/include/uapi/asm/siginfo.h b/arch/mips/include/uapi/asm/siginfo.h index 22a86d8..cf6113b 100644 --- a/arch/mips/include/uapi/asm/siginfo.h +++ b/arch/mips/include/uapi/asm/siginfo.h @@ -123,11 +123,4 @@ typedef struct siginfo { #define SI_TIMER -3 /* sent by timer expiration */ #define SI_MESGQ -4 /* sent by real time mesq state change */ -/* - * SIGFPE si_codes - */ -#ifdef __KERNEL__ -#define FPE_FIXME 0 /* Broken dup of SI_USER */ -#endif /* __KERNEL__ */ - #endif /* _UAPI_ASM_SIGINFO_H */ diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 6c9cca9..2bf4149 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -735,7 +735,7 @@ void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr, else if (fcr31 & FPU_CSR_INE_X) si.si_code = FPE_FLTRES; else - si.si_code = FPE_FIXME; + return; /* Broken hardware? */ force_sig_info(SIGFPE, &si, tsk); } -- 2.7.4