mmc: s3c6410: enable ADMA feature in 6410 sdhci controller

[safe/jmp/linux-2.6] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index dbd7fe0..825a3f2 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2735,3 +2735,43 @@ void __init signals_init(void)
 {
        sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
 }
+
+#ifdef CONFIG_KGDB_KDB
+#include <linux/kdb.h>
+/*
+ * kdb_send_sig_info - Allows kdb to send signals without exposing
+ * signal internals.  This function checks if the required locks are
+ * available before calling the main signal code, to avoid kdb
+ * deadlocks.
+ */
+void
+kdb_send_sig_info(struct task_struct *t, struct siginfo *info)
+{
+       static struct task_struct *kdb_prev_t;
+       int sig, new_t;
+       if (!spin_trylock(&t->sighand->siglock)) {
+               kdb_printf("Can't do kill command now.\n"
+                          "The sigmask lock is held somewhere else in "
+                          "kernel, try again later\n");
+               return;
+       }
+       spin_unlock(&t->sighand->siglock);
+       new_t = kdb_prev_t != t;
+       kdb_prev_t = t;
+       if (t->state != TASK_RUNNING && new_t) {
+               kdb_printf("Process is not RUNNING, sending a signal from "
+                          "kdb risks deadlock\n"
+                          "on the run queue locks. "
+                          "The signal has _not_ been sent.\n"
+                          "Reissue the kill command if you want to risk "
+                          "the deadlock.\n");
+               return;
+       }
+       sig = info->si_signo;
+       if (send_sig_info(sig, info, t))
+               kdb_printf("Fail to deliver Signal %d to process %d.\n",
+                          sig, t->pid);
+       else
+               kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
+}
+#endif /* CONFIG_KGDB_KDB */