Commit 20229305 authored Aug 08, 2017 by Eric W. Biederman

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" <macro@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/20170718140651.15973-4-ebiederm@xmission.com


Ref: ea1b75cf ("signal/mips: Document a conflict with SI_USER with SIGFPE")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

parent cc731525

arch/mips/include/uapi/asm/siginfo.h

+0 −7

Original line number	Diff line number	Diff line
		@@ -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 */

arch/mips/kernel/traps.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}