af52201d99
With the CPU renaming registers on its own, and all the overhead of the syscall entry/exit, it is doubtful whether the compiled output of mov %r8, %rax mov %rcx, %r8 mov %rax, %rcx jmpq sys_clone is measurably slower than the hand-crafted version of xchg %r8, %rcx So get rid of this special case. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: luto@amacapital.net Cc: viro@zeniv.linux.org.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* sys_ia32.h - Linux ia32 syscall interfaces
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*
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* Copyright (c) 2008 Jaswinder Singh Rajput
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*
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* This file is released under the GPLv2.
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* See the file COPYING for more details.
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*/
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#ifndef _ASM_X86_SYS_IA32_H
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#define _ASM_X86_SYS_IA32_H
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#ifdef CONFIG_COMPAT
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <linux/types.h>
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#include <linux/signal.h>
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#include <asm/compat.h>
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#include <asm/ia32.h>
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/* ia32/sys_ia32.c */
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asmlinkage long compat_sys_x86_truncate64(const char __user *, unsigned long,
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unsigned long);
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asmlinkage long compat_sys_x86_ftruncate64(unsigned int, unsigned long,
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unsigned long);
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asmlinkage long compat_sys_x86_stat64(const char __user *,
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struct stat64 __user *);
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asmlinkage long compat_sys_x86_lstat64(const char __user *,
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struct stat64 __user *);
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asmlinkage long compat_sys_x86_fstat64(unsigned int, struct stat64 __user *);
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asmlinkage long compat_sys_x86_fstatat(unsigned int, const char __user *,
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struct stat64 __user *, int);
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struct mmap_arg_struct32;
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asmlinkage long compat_sys_x86_mmap(struct mmap_arg_struct32 __user *);
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asmlinkage long compat_sys_x86_waitpid(compat_pid_t, unsigned int __user *,
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int);
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asmlinkage long compat_sys_x86_pread(unsigned int, char __user *, u32, u32,
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u32);
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asmlinkage long compat_sys_x86_pwrite(unsigned int, const char __user *, u32,
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u32, u32);
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asmlinkage long compat_sys_x86_fadvise64_64(int, __u32, __u32, __u32, __u32,
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int);
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asmlinkage ssize_t compat_sys_x86_readahead(int, unsigned int, unsigned int,
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size_t);
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asmlinkage long compat_sys_x86_sync_file_range(int, unsigned int, unsigned int,
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unsigned int, unsigned int,
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int);
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asmlinkage long compat_sys_x86_fadvise64(int, unsigned int, unsigned int,
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size_t, int);
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asmlinkage long compat_sys_x86_fallocate(int, int, unsigned int, unsigned int,
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unsigned int, unsigned int);
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asmlinkage long compat_sys_x86_clone(unsigned long, unsigned long, int __user *,
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unsigned long, int __user *);
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/* ia32/ia32_signal.c */
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asmlinkage long sys32_sigreturn(void);
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asmlinkage long sys32_rt_sigreturn(void);
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#endif /* CONFIG_COMPAT */
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#endif /* _ASM_X86_SYS_IA32_H */
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