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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>
* 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
support for reiserfs and xfs.

5
sysdeps/unix/sysv/linux/kernel-features.h
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@ -214,6 +214,11 @@
# define __ASSUME_SET_THREAD_AREA_SYSCALL 1
#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
2.4.0. But they've not really been released as such. We require
and expect the final version here. */