__readlink_chk: Assume HAVE_INLINED_SYSCALLS

  On 08/20/2018 06:21 PM, Adhemerval Zanella wrote:
> 
> 
> On 20/08/2018 13:18, Adhemerval Zanella wrote:
>>
>>
>> On 20/08/2018 11:40, Florian Weimer wrote:
>>> HAVE_INLINED_SYSCALLS is always defined on Linux.
>>>
>>> 2018-08-20  Florian Weimer  <fweimer@redhat.com>
>>>
>>> 	* sysdeps/unix/sysv/linux/generic/readlink_chk.c: Remove
>>> 	HAVE_INLINED_SYSCALLS conditionals
>>
>> LGTM.
> 
> In fact, do we really need to have a duplicated Linux implementation
> for this micro-optimization? Couldn't we just use default debug
> one and call '__readlink' instead?

Like this?

Thanks,
Florian
  

On 20/08/2018 13:53, Florian Weimer wrote:
> On 08/20/2018 06:21 PM, Adhemerval Zanella wrote:
>>
>>
>> On 20/08/2018 13:18, Adhemerval Zanella wrote:
>>>
>>>
>>> On 20/08/2018 11:40, Florian Weimer wrote:
>>>> HAVE_INLINED_SYSCALLS is always defined on Linux.
>>>>
>>>> 2018-08-20  Florian Weimer  <fweimer@redhat.com>
>>>>
>>>>     * sysdeps/unix/sysv/linux/generic/readlink_chk.c: Remove
>>>>     HAVE_INLINED_SYSCALLS conditionals
>>>
>>> LGTM.
>>
>> In fact, do we really need to have a duplicated Linux implementation
>> for this micro-optimization? Couldn't we just use default debug
>> one and call '__readlink' instead?
> 
> Like this?
> 

LGTM, thanks.

> Thanks,
> Florian
> 
> readlink_chk.patch
> 
> 
> Subject: [PATCH] __readlink_chk: Remove micro-optimization
> To: libc-alpha@sourceware.org
> 
> 2018-08-20  Florian Weimer  <fweimer@redhat.com>
> 
> 	* debug/readlink_chk.c (__readlink_chk): Always call __readlink.
> 	* sysdeps/unix/sysv/linux/generic/readlink_chk.c: Remove file.
> 
> diff --git a/debug/readlink_chk.c b/debug/readlink_chk.c
> index c44d1d8c37..e3204004d2 100644
> --- a/debug/readlink_chk.c
> +++ b/debug/readlink_chk.c
> @@ -29,9 +29,5 @@ __readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
>    if (len > buflen)
>      __chk_fail ();
>  
> -#ifdef HAVE_INLINED_SYSCALLS
> -  return INLINE_SYSCALL (readlink, 3, path, buf, len);
> -#else
>    return __readlink (path, buf, len);
> -#endif
>  }
> diff --git a/sysdeps/unix/sysv/linux/generic/readlink_chk.c b/sysdeps/unix/sysv/linux/generic/readlink_chk.c
> deleted file mode 100644
> index 52d1f5b522..0000000000
> --- a/sysdeps/unix/sysv/linux/generic/readlink_chk.c
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
> -   This file is part of the GNU C Library.
> -   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
> -
> -   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 <unistd.h>
> -#include <fcntl.h>
> -#include <sys/param.h>
> -# include <errno.h>
> -# include <sysdep.h>
> -
> -
> -ssize_t
> -__readlink_chk (const char *path, void *buf, size_t len, size_t buflen)
> -{
> -  if (len > buflen)
> -    __chk_fail ();
> -
> -  return INLINE_SYSCALL_CALL (readlinkat, AT_FDCWD, path, buf, len);
> -}
>