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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:49 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:43 +0100
commitb6ef5bb3d93efb95ba855a628740375c2280a59e (patch)
treefc26947a0111c7e71085a81e26f12c815f3f4c09 /arch/s390/include/asm/syscall.h
parentccf45cafb0805978e6f13a672caca0e536e87cad (diff)
downloadlinux-sh-b6ef5bb3d93efb95ba855a628740375c2280a59e.tar.gz
[S390] add TIF_SYSCALL thread flag
Add an explicit TIF_SYSCALL bit that indicates if a task is inside a system call. The svc_code in the pt_regs structure is now only valid if TIF_SYSCALL is set. With this definition TIF_RESTART_SVC can be replaced with TIF_SYSCALL. Overall do_signal is a bit more readable and it saves a few lines of code. 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.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/include/asm/syscall.h b/arch/s390/include/asm/syscall.h
index 614267f60713..b239ff53b189 100644
--- a/arch/s390/include/asm/syscall.h
+++ b/arch/s390/include/asm/syscall.h
@@ -26,7 +26,8 @@ extern const unsigned int sys_call_table[];
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
- return regs->svc_code ? (regs->svc_code & 0xffff) : -1;
+ return test_tsk_thread_flag(task, TIF_SYSCALL) ?
+ (regs->svc_code & 0xffff) : -1;
}
static inline void syscall_rollback(struct task_struct *task,