diff mbox

[2/4] Consolidate gettimeofday across aarch64/s390/tile

Message ID 552EC85F.6080506@linaro.org
State New
Headers show

Commit Message

Adhemerval Zanella Netto April 15, 2015, 8:21 p.m. UTC 
This patch removes the architecture specific gettimeofday implementation
to use the vDSO symbol and consolidate it on a common Linux one.
Similat to gettime and getres vDSO implementation, each arch that supports
gettimeofday through vDSO should just implement INLINE_VSYSCALL to access
the symbol and define HAVE_GETTIMEOFDAY_VSYSCAL as 1.

--

	* sysdeps/unix/sysv/linux/aarch64/gettimeofday.c: Remove file.
	* sysdeps/unix/sysv/linux/s390/gettimeofday.c: Likewise.
	* sysdeps/unix/sysv/linux/tile/gettimeofday.c: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h
	[HAVE_GETTIMEOFDAY_VSYSCAL]: Define.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
	[HAVE_GETTIMEOFDAY_VSYSCAL]: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
	[HAVE_GETTIMEOFDAY_VSYSCAL]: Likewise.
	* sysdeps/unix/sysv/linux/tile/sysdep.h
	[HAVE_GETTIMEOFDAY_VSYSCAL]: Likewise.
	* sysdeps/unix/sysv/linux/gettimeofday.c: New file: gettimeofday
	using vDSO syscall macro.

---

Comments

Nathan Lynch April 15, 2015, 9:01 p.m. UTC | #1 
On 04/15/2015 03:21 PM, Adhemerval Zanella wrote:
> diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
> new file mode 100644
> index 0000000..5eaafc0
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/gettimeofday.c
> @@ -0,0 +1,35 @@

[...]

> +#include <errno.h>
> +#include <sys/time.h>
> +#if HAVE_GETTIMEOFDAY_VSYSCAL

Name it HAVE_GETTIMEOFDAY_VSYSCALL instead?
                                 ^

> +# include <bits/libc-vdso.h>
> +#endif
> +
> +/* Get the current time of day and timezone information,
> +   putting it into *tv and *tz.  If tz is null, *tz is not filled.
> +   Returns 0 on success, -1 on errors.  */
> +int
> +__gettimeofday (struct timeval *tv, struct timezone *tz)
> +{
> +  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
> +}

Rather than adding no-op INLINE_VSYSCALL definitions to all
architectures (patch #1), couldn't the common gettimeofday code be made
to effectively do:

#if HAVE_GETTIMEOFDAY_VSYSCALL
  return INLINE_VSYSCALL (gettimeofday, ...);
#else
  return INLINE_SYSCALL (gettimeofday, ...);
#endif
Adhemerval Zanella Netto April 15, 2015, 9:24 p.m. UTC | #2 
Hi

On 15-04-2015 18:01, Nathan Lynch wrote:
> On 04/15/2015 03:21 PM, Adhemerval Zanella wrote:
>> diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
>> new file mode 100644
>> index 0000000..5eaafc0
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/gettimeofday.c
>> @@ -0,0 +1,35 @@
> 
> [...]
> 
>> +#include <errno.h>
>> +#include <sys/time.h>
>> +#if HAVE_GETTIMEOFDAY_VSYSCAL
> 
> Name it HAVE_GETTIMEOFDAY_VSYSCALL instead?

I will change it, thanks.

>                                  ^
> 
>> +# include <bits/libc-vdso.h>
>> +#endif
>> +
>> +/* Get the current time of day and timezone information,
>> +   putting it into *tv and *tz.  If tz is null, *tz is not filled.
>> +   Returns 0 on success, -1 on errors.  */
>> +int
>> +__gettimeofday (struct timeval *tv, struct timezone *tz)
>> +{
>> +  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
>> +}
> 
> Rather than adding no-op INLINE_VSYSCALL definitions to all
> architectures (patch #1), couldn't the common gettimeofday code be made
> to effectively do:
> 
> #if HAVE_GETTIMEOFDAY_VSYSCALL
>   return INLINE_VSYSCALL (gettimeofday, ...);
> #else
>   return INLINE_SYSCALL (gettimeofday, ...);
> #endif
> 

My idea is to exactly get rid of this kind of #if in code and a further cleanup
I am planning to do is to move the INLINE_VSYSCALL in a platform neutral header
and make the vDSO declaration a macro to be used systematically in all ports.
Torvald Riegel April 16, 2015, noon UTC | #3 
On Wed, 2015-04-15 at 16:01 -0500, Nathan Lynch wrote:
> On 04/15/2015 03:21 PM, Adhemerval Zanella wrote:
> > diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
> > new file mode 100644
> > index 0000000..5eaafc0
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/gettimeofday.c
> > @@ -0,0 +1,35 @@
> 
> [...]
> 
> > +#include <errno.h>
> > +#include <sys/time.h>
> > +#if HAVE_GETTIMEOFDAY_VSYSCAL
> 
> Name it HAVE_GETTIMEOFDAY_VSYSCALL instead?

Why didn't this fail a build due to an undef warning?
Adhemerval Zanella Netto April 16, 2015, 12:24 p.m. UTC | #4 
On 16-04-2015 09:00, Torvald Riegel wrote:
> On Wed, 2015-04-15 at 16:01 -0500, Nathan Lynch wrote:
>> On 04/15/2015 03:21 PM, Adhemerval Zanella wrote:
>>> diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
>>> new file mode 100644
>>> index 0000000..5eaafc0
>>> --- /dev/null
>>> +++ b/sysdeps/unix/sysv/linux/gettimeofday.c
>>> @@ -0,0 +1,35 @@
>>
>> [...]
>>
>>> +#include <errno.h>
>>> +#include <sys/time.h>
>>> +#if HAVE_GETTIMEOFDAY_VSYSCAL
>>
>> Name it HAVE_GETTIMEOFDAY_VSYSCALL instead?
> 
> Why didn't this fail a build due to an undef warning?
> 

Because I used HAVE_GETTIMEOFDAY_VSYSCAL 'consistently' over the patch.
diff mbox

Patch

diff --git a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
deleted file mode 100644
index 950666f..0000000
--- a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
+++ /dev/null
@@ -1,38 +0,0 @@ 
-/* Copyright (C) 2005-2015 Free Software Foundation, Inc.
-
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <errno.h>
-#include <sys/time.h>
-
-#undef __gettimeofday
-
-#include <bits/libc-vdso.h>
-
-/* Get the current time of day and timezone information,
-   putting it into *tv and *tz.  If tz is null, *tz is not filled.
-   Returns 0 on success, -1 on errors.  */
-int
-__gettimeofday (tv, tz)
-     struct timeval *tv;
-     struct timezone *tz;
-{
-  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
-}
-libc_hidden_def (__gettimeofday)
-weak_alias (__gettimeofday, gettimeofday)
-libc_hidden_weak (gettimeofday)
diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index 91e03fc..58884cd 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -208,6 +208,7 @@ 
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETRES_VSYSCALL	1
 # define HAVE_CLOCK_GETTIME_VSYSCALL	1
+# define HAVE_GETTIMEOFDAY_VSYSCAL	1
 
 # define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...)	\
   ({								\
diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
new file mode 100644
index 0000000..5eaafc0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/gettimeofday.c
@@ -0,0 +1,35 @@ 
+/* Copyright (C) 2015 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <sys/time.h>
+#if HAVE_GETTIMEOFDAY_VSYSCAL
+# include <bits/libc-vdso.h>
+#endif
+
+/* Get the current time of day and timezone information,
+   putting it into *tv and *tz.  If tz is null, *tz is not filled.
+   Returns 0 on success, -1 on errors.  */
+int
+__gettimeofday (struct timeval *tv, struct timezone *tz)
+{
+  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
+}
+libc_hidden_def (__gettimeofday)
+weak_alias (__gettimeofday, gettimeofday)
+libc_hidden_weak (gettimeofday)
diff --git a/sysdeps/unix/sysv/linux/s390/gettimeofday.c b/sysdeps/unix/sysv/linux/s390/gettimeofday.c
deleted file mode 100644
index 68acca4..0000000
--- a/sysdeps/unix/sysv/linux/s390/gettimeofday.c
+++ /dev/null
@@ -1,39 +0,0 @@ 
-/* Copyright (C) 2008-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <stddef.h>
-#include <sys/time.h>
-#include <time.h>
-#include <hp-timing.h>
-
-#include <bits/libc-vdso.h>
-
-/* Get the current time of day and timezone information,
-   putting it into *TV and *TZ.  If TZ is NULL, *TZ is not filled.
-   Returns 0 on success, -1 on errors.  */
-
-int
-__gettimeofday (tv, tz)
-     struct timeval *tv;
-     struct timezone *tz;
-{
-  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
-}
-libc_hidden_def (__gettimeofday)
-weak_alias (__gettimeofday, gettimeofday)
-libc_hidden_weak (gettimeofday)
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 9c194b8..072c00e 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -281,6 +281,7 @@ 
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETRES_VSYSCALL	1
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETTIMEOFDAY_VSYSCAL	1
 
 /* This version is for kernels that implement system calls that
    behave like function calls as far as register saving.
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 4631cb1..a5cc17d 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -287,6 +287,7 @@ 
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETRES_VSYSCALL	1
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETTIMEOFDAY_VSYSCAL	1
 
 /* This version is for kernels that implement system calls that
    behave like function calls as far as register saving.
diff --git a/sysdeps/unix/sysv/linux/tile/gettimeofday.c b/sysdeps/unix/sysv/linux/tile/gettimeofday.c
deleted file mode 100644
index 05c6298..0000000
--- a/sysdeps/unix/sysv/linux/tile/gettimeofday.c
+++ /dev/null
@@ -1,32 +0,0 @@ 
-/* Copyright (C) 2012-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-#include <stddef.h>
-#include <sys/time.h>
-#include <time.h>
-#include <bits/libc-vdso.h>
-
-int
-__gettimeofday (struct timeval *tv, struct timezone *tz)
-{
-  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
-}
-
-libc_hidden_def (__gettimeofday)
-weak_alias (__gettimeofday, gettimeofday)
-libc_hidden_weak (gettimeofday)
diff --git a/sysdeps/unix/sysv/linux/tile/sysdep.h b/sysdeps/unix/sysv/linux/tile/sysdep.h
index 64c8920..c4a291e 100644
--- a/sysdeps/unix/sysv/linux/tile/sysdep.h
+++ b/sysdeps/unix/sysv/linux/tile/sysdep.h
@@ -266,6 +266,7 @@ 
 
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
+#define HAVE_GETTIMEOFDAY_VSYSCAL	1
 
 /* Pointer mangling support.  */
 #if IS_IN (rtld)