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Remove __ASSUME_COMPLETE_READV_WRITEV.

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This patch removes the __ASSUME_COMPLETE_READV_WRITEV
kernel-features.h macro, now that it can be unconditionally assumed to
be true.  (The relevant kernel feature was added some time between 2.0
and 2.2, and this macro is only used in sysdeps/unix/sysv/linux/.)

Tested x86_64 that the disassembly of installed shared libraries is
unchanged by this patch.

	* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_COMPLETE_READV_WRITEV): Remove macro.
	* sysdeps/unix/sysv/linux/readv.c: Do not include
	<kernel-features.h>.
	[!__ASSUME_COMPLETE_READV_WRITEV]: Remove conditional code.
	[!UIO_FASTIOV] (UIO_FASTIOV): Remove macro.
	(__libc_readv) [__ASSUME_COMPLETE_READV_WRITEV]: Make code
	unconditional.
	(__libc_readv) [!__ASSUME_COMPLETE_READV_WRITEV]: Remove
	conditional code.
	* sysdeps/unix/sysv/linux/writev.c: Do not include
	<kernel-features.h>.
	[!__ASSUME_COMPLETE_READV_WRITEV]: Remove conditional code.
	[!UIO_FASTIOV] (UIO_FASTIOV): Remove macro.
	(__libc_writev) [__ASSUME_COMPLETE_READV_WRITEV]: Make code
	unconditional.
	(__libc_writev) [!__ASSUME_COMPLETE_READV_WRITEV]: Remove
	conditional code.
This commit is contained in:
Joseph Myers
2014-06-25 11:31:51 +00:00
parent c7aec4beb1
commit 0f5b71850e
4 changed files with 23 additions and 52 deletions
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24
sysdeps/unix/sysv/linux/writev.c
View File

@ -23,19 +23,9 @@
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#include <kernel-features.h>
#ifndef __ASSUME_COMPLETE_READV_WRITEV
static ssize_t __atomic_writev_replacement (int, const struct iovec *,
int) internal_function;
#endif
/* Not all versions of the kernel support the large number of records. */
#ifndef UIO_FASTIOV
# define UIO_FASTIOV 8 /* 8 is a safe number. */
#endif
/* Consider moving to syscalls.list. */
ssize_t
__libc_writev (fd, vector, count)
@ -56,19 +46,7 @@ __libc_writev (fd, vector, count)
LIBC_CANCEL_RESET (oldtype);
}
#ifdef __ASSUME_COMPLETE_READV_WRITEV
return result;
#else
if (result >= 0 || errno != EINVAL || count <= UIO_FASTIOV)
return result;
return __atomic_writev_replacement (fd, vector, count);
#endif
}
strong_alias (__libc_writev, __writev)
weak_alias (__libc_writev, writev)
#ifndef __ASSUME_COMPLETE_READV_WRITEV
# define __libc_writev static internal_function __atomic_writev_replacement
# include <sysdeps/posix/writev.c>
#endif