diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-04-24 12:58:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-04-26 09:07:05 +0200 |
| commit | 616498813b11ffefe1ed36b9f2e4fd2cdbd22f15 (patch) | |
| tree | 1748b3171ab5cf1ada0c0bbeef285352c37edfcd /arch/s390/include/asm/syscall.h | |
| parent | s390: lowcore stack pointer offsets (diff) | |
| download | linux-616498813b11ffefe1ed36b9f2e4fd2cdbd22f15.tar.xz linux-616498813b11ffefe1ed36b9f2e4fd2cdbd22f15.zip | |
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 <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/syscall.h')
| -rw-r--r-- | arch/s390/include/asm/syscall.h | 1 |
1 files changed, 1 insertions, 0 deletions
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) |