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| author | Ulrich Drepper <drepper@redhat.com> | 2002-10-16 04:42:33 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2002-10-16 04:42:33 +0000 |
| commit | 885bc0246bfef6d3f9337c33d240e120ef1e5889 (patch) | |
| tree | df083ecdb809c43ebd1ad193aa33a439fc3ca7b1 /sysdeps | |
| parent | 708296036c9753b9d08cba905a398f11095101c9 (diff) | |
| download | glibc-885bc0246bfef6d3f9337c33d240e120ef1e5889.zip glibc-885bc0246bfef6d3f9337c33d240e120ef1e5889.tar.gz glibc-885bc0246bfef6d3f9337c33d240e120ef1e5889.tar.bz2 | |
Update.
* 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.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index a8145e1..0796a8a 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -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. */ |