arc: add support for TIF_NOTIFY_SIGNAL

Wire up TIF_NOTIFY_SIGNAL handling for arc.

Cc: linux-snps-arc@lists.infradead.org
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h
index f9eef0e..c0942c2 100644 (file)
--- a/arch/arc/include/asm/thread_info.h
+++ b/arch/arc/include/asm/thread_info.h
@@ -79,6 +79,7 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
 #define TIF_SIGPENDING         2       /* signal pending */
 #define TIF_NEED_RESCHED       3       /* rescheduling necessary */
 #define TIF_SYSCALL_AUDIT      4       /* syscall auditing active */
+#define TIF_NOTIFY_SIGNAL      5       /* signal notifications exist */
 #define TIF_SYSCALL_TRACE      15      /* syscall trace active */
 
 /* true if poll_idle() is polling TIF_NEED_RESCHED */
@@ -89,11 +90,12 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING                (1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED      (1<<TIF_NEED_RESCHED)
 #define _TIF_SYSCALL_AUDIT     (1<<TIF_SYSCALL_AUDIT)
+#define _TIF_NOTIFY_SIGNAL     (1<<TIF_NOTIFY_SIGNAL)
 #define _TIF_MEMDIE            (1<<TIF_MEMDIE)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK         (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
-                                _TIF_NOTIFY_RESUME)
+                                _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
 
 /*
  * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index ea00c8a..1f5308a 100644 (file)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -307,7 +307,8 @@ resume_user_mode_begin:
        mov r0, sp      ; pt_regs for arg to do_signal()/do_notify_resume()
 
        GET_CURR_THR_INFO_FLAGS   r9
-       bbit0  r9, TIF_SIGPENDING, .Lchk_notify_resume
+       and.f  0,  r9, TIF_SIGPENDING|TIF_NOTIFY_SIGNAL
+       bz .Lchk_notify_resume
 
        ; Normal Trap/IRQ entry only saves Scratch (caller-saved) regs
        ; in pt_reg since the "C" ABI (kernel code) will automatically

diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 2be55fb..a78d8f7 100644 (file)
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -362,7 +362,7 @@ void do_signal(struct pt_regs *regs)
 
        restart_scall = in_syscall(regs) && syscall_restartable(regs);
 
-       if (get_signal(&ksig)) {
+       if (test_thread_flag(TIF_SIGPENDING) && get_signal(&ksig)) {
                if (restart_scall) {
                        arc_restart_syscall(&ksig.ka, regs);
                        syscall_wont_restart(regs);     /* No more restarts */