uml: eliminate SIGALRM

Now that ITIMER_REAL is no longer used, there is no need for any use of
SIGALRM whatsoever.  This patch removes all mention of it.

In addition, real_alarm_handler took a signal argument which is now always
SIGVTALRM.  So, that is gone.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 21 deletions

diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index fbad174775ee..e9800b0b5689 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -15,8 +15,7 @@
 #include "user.h"
 
 /*
- * These are the asynchronous signals.  SIGVTALRM and SIGARLM are handled
- * together under SIGVTALRM_BIT.  SIGPROF is excluded because we want to
+ * These are the asynchronous signals.  SIGPROF is excluded because we want to
  * be able to profile all of UML, not just the non-critical sections.  If
  * profiling is not thread-safe, then that is not my problem.  We can disable
  * profiling when SMP is enabled in that case.
@@ -27,9 +26,6 @@
 #define SIGVTALRM_BIT 1
 #define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
 
-#define SIGALRM_BIT 2
-#define SIGALRM_MASK (1 << SIGALRM_BIT)
-
 /*
  * These are used by both the signal handlers and
  * block/unblock_signals.  I don't want modifications cached in a
@@ -55,7 +51,7 @@ void sig_handler(int sig, struct sigcontext *sc)
         set_signals(enabled);
 }
 
-static void real_alarm_handler(int sig, struct sigcontext *sc)
+static void real_alarm_handler(struct sigcontext *sc)
 {
         struct uml_pt_regs regs;
 
@@ -63,7 +59,7 @@ static void real_alarm_handler(int sig, struct sigcontext *sc)
                 copy_sc(&regs, sc);
         regs.is_user = 0;
         unblock_signals();
-        timer_handler(sig, &regs);
+        timer_handler(SIGVTALRM, &regs);
 }
 
 void alarm_handler(int sig, struct sigcontext *sc)
@@ -72,27 +68,20 @@ void alarm_handler(int sig, struct sigcontext *sc)
 
         enabled = signals_enabled;
         if (!signals_enabled) {
-                if (sig == SIGVTALRM)
-                        pending |= SIGVTALRM_MASK;
-                else pending |= SIGALRM_MASK;
-
+                pending |= SIGVTALRM_MASK;
                 return;
         }
 
         block_signals();
 
-        real_alarm_handler(sig, sc);
+        real_alarm_handler(sc);
         set_signals(enabled);
 }
 
 void timer_init(void)
 {
         set_handler(SIGVTALRM, (__sighandler_t) alarm_handler,
-                    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
-                    SIGALRM, -1);
-        set_handler(SIGALRM, (__sighandler_t) alarm_handler,
-                    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH,
-                    SIGALRM, -1);
+                    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, -1);
 }
 
 void set_sigstack(void *sig_stack, int size)
@@ -267,11 +256,8 @@ void unblock_signals(void)
                 if (save_pending & SIGIO_MASK)
                         sig_handler_common_skas(SIGIO, NULL);
 
-                if (save_pending & SIGALRM_MASK)
-                        real_alarm_handler(SIGALRM, NULL);
-
                 if (save_pending & SIGVTALRM_MASK)
-                        real_alarm_handler(SIGVTALRM, NULL);
+                        real_alarm_handler(NULL);
         }
 }