linux-kernel - [REVIEW][PATCH 11/17] signal/alpha: Replace FPE_FIXME with FPE

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Date:   Thu, 19 Apr 2018 20:04:02 -0500
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-arch@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Helge Deller <deller@....de>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org
Subject: [REVIEW][PATCH 11/17] signal/alpha: Replace FPE_FIXME with FPE_FLTUNK

Using an si_code of 0 that aliases with SI_USER is clearly the wrong
thing todo, and causes problems in interesting ways.

The newly defined FPE_FLTUNK semantically appears to fit the bill so
use it instead.

Given recent experience in this area odds are it will not break
anything.  Fixing it removes a hazard to kernel maintenance.

Cc: Helge Deller <deller@....de>
Cc: Richard Henderson <rth@...ddle.net>
Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc: Matt Turner <mattst88@...il.com>
Cc: linux-alpha@...r.kernel.org
History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Fixes: 0a635c7a84cf ("Fill in siginfo_t.")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/alpha/include/uapi/asm/siginfo.h | 7 -------
 arch/alpha/kernel/osf_sys.c           | 2 +-
 arch/alpha/kernel/traps.c             | 2 +-
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/alpha/include/uapi/asm/siginfo.h b/arch/alpha/include/uapi/asm/siginfo.h
index 0cf3b527b274..3ebbb1e17902 100644
--- a/arch/alpha/include/uapi/asm/siginfo.h
+++ b/arch/alpha/include/uapi/asm/siginfo.h
@@ -7,13 +7,6 @@
 
 #include <asm-generic/siginfo.h>
 
-/*
- * SIGFPE si_codes
- */
-#ifdef __KERNEL__
-#define FPE_FIXME	0	/* Broken dup of SI_USER */
-#endif /* __KERNEL__ */
-
 /*
  * SIGTRAP si_codes
  */
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index f5f154942aab..bb3619118926 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -872,7 +872,7 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
  		if (fex) {
 			siginfo_t info;
-			int si_code = FPE_FIXME;
+			int si_code = FPE_FLTUNK;
 
 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 91636765dd6d..422b676b28f2 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -328,7 +328,7 @@ do_entIF(unsigned long type, struct pt_regs *regs)
 			break;
 		case GEN_ROPRAND:
 			signo = SIGFPE;
-			code = FPE_FIXME;
+			code = FPE_FLTUNK;
 			break;
 
 		case GEN_DECOVF:
-- 
2.14.1