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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 15:16:49 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-10-30 15:16:43 +0100 |
| commit | b6ef5bb3d93efb95ba855a628740375c2280a59e (patch) | |
| tree | fc26947a0111c7e71085a81e26f12c815f3f4c09 /arch/s390/include | |
| parent | ccf45cafb0805978e6f13a672caca0e536e87cad (diff) | |
| download | lwn-b6ef5bb3d93efb95ba855a628740375c2280a59e.tar.gz lwn-b6ef5bb3d93efb95ba855a628740375c2280a59e.zip | |
[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')
| -rw-r--r-- | arch/s390/include/asm/syscall.h | 3 | ||||
| -rw-r--r-- | arch/s390/include/asm/thread_info.h | 4 |
2 files changed, 4 insertions, 3 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, diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h index 0c4788eb5a65..a23183423b14 100644 --- a/arch/s390/include/asm/thread_info.h +++ b/arch/s390/include/asm/thread_info.h @@ -85,10 +85,10 @@ static inline struct thread_info *current_thread_info(void) /* * thread information flags bit numbers */ +#define TIF_SYSCALL 0 /* inside a system call */ #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ -#define TIF_RESTART_SVC 4 /* restart svc with new svc number */ #define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */ #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ @@ -104,11 +104,11 @@ static inline struct thread_info *current_thread_info(void) #define TIF_SINGLE_STEP 20 /* This task is single stepped */ #define TIF_FREEZE 21 /* thread is freezing for suspend */ +#define _TIF_SYSCALL (1<<TIF_SYSCALL) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) -#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) #define _TIF_PER_TRAP (1<<TIF_PER_TRAP) #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |