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[5/8] Use libc_ifunc macro for clock_* symbols in librt.

Message ID nldp9b$61e$4@ger.gmane.org
State Superseded
Headers show

Commit Message

Stefan Liebler July 4, 2016, 1:45 p.m. UTC
On 07/04/2016 11:14 AM, Florian Weimer wrote:
> On 06/23/2016 01:55 PM, Stefan Liebler wrote:
>> +# define INIT_ARCH()
>> +# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name,
>> &__##name)
>
> Doesn't this cause INIT_ARCH redefinition warnings in some cases?
>
> Thanks,
> Florian
>
At the moment INIT_ARCH is only defined in
-sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
-sysdeps/x86/cpu-features.h

The latter one is included in ldsodefs.h which is included in dl-vdso.h.
Thus the undef is needed in x86/i386 time.c/gettimeofday.c.

I built and run testsuite for intel, power and s390. There did not occur 
a redefinition warning.

Nevertheless, this is a good point and I add an undef INIT_ARCH before 
the definition in this patch and the other "Use libc_ifunc macro for ABC 
in libDEF." patches.
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Patch

From d80e99d0fcd917cdd66a8d9697e75de59e67b863 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Mon, 4 Jul 2016 15:33:56 +0200
Subject: [PATCH 5/8] Use libc_ifunc macro for clock_* symbols in librt.

This patch uses the libc_ifunc macro to create already existing ifunc functions
clock_getres, clock_gettime, clock_settime, clock_getcpuclockid and
clock_nanosleep. If HAVE_IFUNC is defined, the macro COMPAT_REDIRECT uses
the libc_ifunc macro.
Furthermore some whitespace damage is cleaned.

ChangeLog:

	* rt/clock-compat.c (COMPAT_REDIRECT): Use libc_ifunc macro.
---
 rt/clock-compat.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/rt/clock-compat.c b/rt/clock-compat.c
index dc69e4a..b47781c 100644
--- a/rt/clock-compat.c
+++ b/rt/clock-compat.c
@@ -28,13 +28,9 @@ 
 #include <time.h>
 
 #if HAVE_IFUNC
-# define COMPAT_REDIRECT(name, proto, arglist)				      \
-  __typeof (name) *name##_ifunc (void) asm (#name);			      \
-  __typeof (name) *name##_ifunc (void)					      \
-  {									      \
-    return &__##name;							      \
-  }									      \
-  asm (".type " #name ", %gnu_indirect_function");
+# undef INIT_ARCH
+# define INIT_ARCH()
+# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name, &__##name)
 #else
 # define COMPAT_REDIRECT(name, proto, arglist)				      \
   int									      \
@@ -45,21 +41,21 @@ 
 #endif
 
 COMPAT_REDIRECT (clock_getres,
-                 (clockid_t clock_id, struct timespec *res),
-                 (clock_id, res))
+		 (clockid_t clock_id, struct timespec *res),
+		 (clock_id, res))
 COMPAT_REDIRECT (clock_gettime,
-                 (clockid_t clock_id, struct timespec *tp),
-                 (clock_id, tp))
+		 (clockid_t clock_id, struct timespec *tp),
+		 (clock_id, tp))
 COMPAT_REDIRECT (clock_settime,
-                 (clockid_t clock_id, const struct timespec *tp),
-                 (clock_id, tp))
+		 (clockid_t clock_id, const struct timespec *tp),
+		 (clock_id, tp))
 COMPAT_REDIRECT (clock_getcpuclockid,
-                 (pid_t pid, clockid_t *clock_id),
-                 (pid, clock_id))
+		 (pid_t pid, clockid_t *clock_id),
+		 (pid, clock_id))
 COMPAT_REDIRECT (clock_nanosleep,
-                 (clockid_t clock_id, int flags,
-                  const struct timespec *req,
-                  struct timespec *rem),
-                 (clock_id, flags, req, rem))
+		 (clockid_t clock_id, int flags,
+		  const struct timespec *req,
+		  struct timespec *rem),
+		 (clock_id, flags, req, rem))
 
 #endif
-- 
2.3.0