FRV: Implement TIF_NOTIFY_RESUME

Implement the TIF_NOTIFY_RESUME thread flag, making it call do_notify_resume()
which then clears it.  This will be made use of later by tracehooks in the
new-style ptrace implementation

Also discard TIF_IRET as that's not used by FRV.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/frv/include/asm/thread_info.h b/arch/frv/include/asm/thread_info.h
index bb53ab7..e8a5ed7 100644 (file)
--- a/arch/frv/include/asm/thread_info.h
+++ b/arch/frv/include/asm/thread_info.h
@@ -109,20 +109,20 @@ register struct thread_info *__current_thread_info asm("gr15");
  * - other flags in MSW
  */
 #define TIF_SYSCALL_TRACE      0       /* syscall trace active */
-#define TIF_SIGPENDING         1       /* signal pending */
-#define TIF_NEED_RESCHED       2       /* rescheduling necessary */
-#define TIF_SINGLESTEP         3       /* restore singlestep on return to user mode */
-#define TIF_IRET               4       /* return with iret */
+#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_SINGLESTEP         4       /* restore singlestep on return to user mode */
 #define TIF_RESTORE_SIGMASK    5       /* restore signal mask in do_signal() */
 #define TIF_POLLING_NRFLAG     16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE             17      /* OOM killer killed process */
 #define TIF_FREEZE             18      /* freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
+#define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING                (1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED      (1 << TIF_NEED_RESCHED)
 #define _TIF_SINGLESTEP                (1 << TIF_SINGLESTEP)
-#define _TIF_IRET              (1 << TIF_IRET)
 #define _TIF_RESTORE_SIGMASK   (1 << TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
 #define _TIF_FREEZE            (1 << TIF_FREEZE)

diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index 3bdb368..7ae290a 100644 (file)
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -564,4 +564,9 @@ asmlinkage void do_notify_resume(__u32 thread_info_flags)
        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
                do_signal();
 
+       /* deal with notification on about to resume userspace execution */
+       if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+               clear_thread_flag(TIF_NOTIFY_RESUME);
+       }
+
 } /* end do_notify_resume() */