From 616498813b11ffefe1ed36b9f2e4fd2cdbd22f15 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 24 Apr 2013 12:58:39 +0200 Subject: s390: system call path micro optimization Add a pointer to the system call table to the thread_info structure. The TIF_31BIT bit is set or cleared by SET_PERSONALITY exactly once for the lifetime of a process. With the pointer to the correct system call table in thread_info the system call code in entry64.S path can drop the check for TIF_31BIT which saves a couple of instructions. Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/syscall.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/include/asm/syscall.h') diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h index fe7b99759e12..cd29d2f4e4f3 100644 --- a/arch/s390/include/asm/syscall.h +++ b/arch/s390/include/asm/syscall.h @@ -23,6 +23,7 @@ * type here is what we want [need] for both 32 bit and 64 bit systems. */ extern const unsigned int sys_call_table[]; +extern const unsigned int sys_call_table_emu[]; static inline long syscall_get_nr(struct task_struct *task, struct pt_regs *regs) -- cgit v1.2.3