From 885bc0246bfef6d3f9337c33d240e120ef1e5889 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 16 Oct 2002 04:42:33 +0000 Subject: 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. --- sysdeps/unix/sysv/linux/kernel-features.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'sysdeps/unix/sysv/linux/kernel-features.h') diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index a8145e1590..0796a8a1fd 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. */ -- cgit v1.2.3