sparc64: Use a TS_RESTORE_SIGMASK

This mirrors x86 changeset 5a8da0ea82db6fa9737041381079fd16f25dcce2
("signals: x86 TS_RESTORE_SIGMASK") on sparc64.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index b9b785f..16689b2 100644 (file)
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -46,7 +46,7 @@ __handle_user_windows:
                wrpr                    %g0, RTRAP_PSTATE_IRQOFF, %pstate
                ldx                     [%g6 + TI_FLAGS], %l0
 
-1:             andcc                   %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+1:             andcc                   %l0, _TIF_SIGPENDING, %g0
                be,pt                   %xcc, __handle_user_windows_continue
                 nop
                mov                     %l5, %o1
@@ -86,7 +86,7 @@ __handle_perfctrs:
                 wrpr                   %g0, RTRAP_PSTATE, %pstate
                wrpr                    %g0, RTRAP_PSTATE_IRQOFF, %pstate
                ldx                     [%g6 + TI_FLAGS], %l0
-1:             andcc                   %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+1:             andcc                   %l0, _TIF_SIGPENDING, %g0
 
                be,pt                   %xcc, __handle_perfctrs_continue
                 sethi                  %hi(TSTATE_PEF), %o0
@@ -195,7 +195,7 @@ __handle_preemption_continue:
                 andcc                  %l1, %o0, %g0
                andcc                   %l0, _TIF_NEED_RESCHED, %g0
                bne,pn                  %xcc, __handle_preemption
-                andcc                  %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+                andcc                  %l0, _TIF_SIGPENDING, %g0
                bne,pn                  %xcc, __handle_signal
 __handle_signal_continue:
                 ldub                   [%g6 + TI_WSAVED], %o2

diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index 2378482..6e4dc67 100644 (file)
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -247,7 +247,9 @@ static long _sigpause_common(old_sigset_t set)
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
-       set_thread_flag(TIF_RESTORE_SIGMASK);
+
+       set_restore_sigmask();
+
        return -ERESTARTNOHAND;
 }
 
@@ -537,7 +539,7 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
        } else
                restart_syscall = 0;
 
-       if (test_thread_flag(TIF_RESTORE_SIGMASK))
+       if (current_thread_info()->status & TS_RESTORE_SIGMASK)
                oldset = &current->saved_sigmask;
        else
                oldset = &current->blocked;
@@ -566,13 +568,12 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
                        syscall_restart(orig_i0, regs, &ka.sa);
                handle_signal(signr, &ka, &info, oldset, regs);
 
-               /* a signal was successfully delivered; the saved
+               /* A signal was successfully delivered; the saved
                 * sigmask will have been stored in the signal frame,
                 * and will be restored by sigreturn, so we can simply
-                * clear the TIF_RESTORE_SIGMASK flag.
+                * clear the TS_RESTORE_SIGMASK flag.
                 */
-               if (test_thread_flag(TIF_RESTORE_SIGMASK))
-                       clear_thread_flag(TIF_RESTORE_SIGMASK);
+               current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
                return;
        }
        if (restart_syscall &&
@@ -591,17 +592,17 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
                regs->tnpc -= 4;
        }
 
-       /* if there's no signal to deliver, we just put the saved sigmask
+       /* If there's no signal to deliver, we just put the saved sigmask
         * back
         */
-       if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-               clear_thread_flag(TIF_RESTORE_SIGMASK);
+       if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+               current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
        }
 }
 
 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
 {
-       if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+       if (thread_info_flags & _TIF_SIGPENDING)
                do_signal(regs, orig_i0);
 }

diff --git a/arch/sparc64/kernel/signal32.c b/arch/sparc64/kernel/signal32.c
index 3f19e9a..97cdd1b 100644 (file)
--- a/arch/sparc64/kernel/signal32.c
+++ b/arch/sparc64/kernel/signal32.c
@@ -788,13 +788,12 @@ void do_signal32(sigset_t *oldset, struct pt_regs * regs,
                        syscall_restart32(orig_i0, regs, &ka.sa);
                handle_signal32(signr, &ka, &info, oldset, regs);
 
-               /* a signal was successfully delivered; the saved
+               /* A signal was successfully delivered; the saved
                 * sigmask will have been stored in the signal frame,
                 * and will be restored by sigreturn, so we can simply
-                * clear the TIF_RESTORE_SIGMASK flag.
+                * clear the TS_RESTORE_SIGMASK flag.
                 */
-               if (test_thread_flag(TIF_RESTORE_SIGMASK))
-                       clear_thread_flag(TIF_RESTORE_SIGMASK);
+               current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
                return;
        }
        if (restart_syscall &&
@@ -813,11 +812,11 @@ void do_signal32(sigset_t *oldset, struct pt_regs * regs,
                regs->tnpc -= 4;
        }
 
-       /* if there's no signal to deliver, we just put the saved sigmask
+       /* If there's no signal to deliver, we just put the saved sigmask
         * back
         */
-       if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-               clear_thread_flag(TIF_RESTORE_SIGMASK);
+       if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+               current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
        }
 }

diff --git a/include/asm-sparc64/thread_info.h b/include/asm-sparc64/thread_info.h
index 71e42d1..e5873e3 100644 (file)
--- a/include/asm-sparc64/thread_info.h
+++ b/include/asm-sparc64/thread_info.h
@@ -38,7 +38,7 @@ struct thread_info {
        struct task_struct      *task;
        unsigned long           flags;
        __u8                    fpsaved[7];
-       __u8                    pad;
+       __u8                    status;
        unsigned long           ksp;
 
        /* D$ line 2 */
@@ -217,7 +217,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
  *      nop
  */
 #define TIF_SYSCALL_TRACE      0       /* syscall trace active */
-#define TIF_RESTORE_SIGMASK    1       /* restore signal mask in do_signal() */
+/* flags bit 1 is available */
 #define TIF_SIGPENDING         2       /* signal pending */
 #define TIF_NEED_RESCHED       3       /* rescheduling necessary */
 #define TIF_PERFCTR            4       /* performance counters active */
@@ -244,14 +244,34 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define _TIF_32BIT             (1<<TIF_32BIT)
 #define _TIF_SECCOMP           (1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_AUDIT     (1<<TIF_SYSCALL_AUDIT)
-#define _TIF_RESTORE_SIGMASK   (1<<TIF_RESTORE_SIGMASK)
 #define _TIF_ABI_PENDING       (1<<TIF_ABI_PENDING)
 #define _TIF_POLLING_NRFLAG    (1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_USER_WORK_MASK    ((0xff << TI_FLAG_WSAVED_SHIFT) | \
-                                (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | \
+                                (_TIF_SIGPENDING | \
                                  _TIF_NEED_RESCHED | _TIF_PERFCTR))
 
+/*
+ * Thread-synchronous status.
+ *
+ * This is different from the flags in that nobody else
+ * ever touches our thread-synchronous status, so we don't
+ * have to worry about atomic accesses.
+ *
+ * Note that there are only 8 bits available.
+ */
+#define TS_RESTORE_SIGMASK     0x0001  /* restore signal mask in do_signal() */
+
+#ifndef __ASSEMBLY__
+#define HAVE_SET_RESTORE_SIGMASK       1
+static inline void set_restore_sigmask(void)
+{
+       struct thread_info *ti = current_thread_info();
+       ti->status |= TS_RESTORE_SIGMASK;
+       set_bit(TIF_SIGPENDING, &ti->flags);
+}
+#endif /* !__ASSEMBLY__ */
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_THREAD_INFO_H */