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* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_VFORK_SYSCALL):
	Define for 2.4+ kernels.

	* sysdeps/unix/sysv/linux/i386/vfork.S: Optimize for kernels which
	are known to have the vfork syscall.  Don't confuse the CPUs
	branch prediction unit by jumping to the return address.
This commit is contained in:
Ulrich Drepper 2002-10-16 04:42:33 +00:00
parent 708296036c
commit 885bc0246b
2 changed files with 12 additions and 0 deletions
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ChangeLog
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@ -70,6 +70,13 @@
2002-10-15 Ulrich Drepper <drepper@redhat.com> 2002-10-15 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_VFORK_SYSCALL):
Define for 2.4+ kernels.
* sysdeps/unix/sysv/linux/i386/vfork.S: Optimize for kernels which
are known to have the vfork syscall. Don't confuse the CPUs
branch prediction unit by jumping to the return address.
* sysdeps/unix/sysv/linux/alpha/fpathconf.c (__fpathconf): Add * sysdeps/unix/sysv/linux/alpha/fpathconf.c (__fpathconf): Add
support for reiserfs and xfs. support for reiserfs and xfs.

5
sysdeps/unix/sysv/linux/kernel-features.h
View File

@ -214,6 +214,11 @@
# define __ASSUME_SET_THREAD_AREA_SYSCALL 1 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1
#endif #endif
/* The vfork syscall on x86 was definitely available in 2.4. */
#if __LINUX_KERNEL_VERSION >= 132097 && defined __i386__
# define __ASSUME_VFORK_SYSCALL 1
#endif
/* There are an infinite number of PA-RISC kernel versions numbered /* There are an infinite number of PA-RISC kernel versions numbered
2.4.0. But they've not really been released as such. We require 2.4.0. But they've not really been released as such. We require
and expect the final version here. */ and expect the final version here. */