Merge tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

Pull kgdb/kdb updates from Jason Wessel:
 "KGDB/KDB New:
   - KDB: improved searching
   - No longer enter debug core on panic if panic timeout is set

  KGDB/KDB regressions / cleanups
   - fix pdf doc build errors
   - prevent junk characters on kdb console from printk levels"

* tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb:
  kgdb, docs: Fix <para> pdfdocs build errors
  debug: prevent entering debug mode on panic/exception.
  kdb: Const qualifier for kdb_getstr's prompt argument
  kdb: Provide forward search at more prompt
  kdb: Fix a prompt management bug when using | grep
  kdb: Remove stack dump when entering kgdb due to NMI
  kdb: Avoid printing KERN_ levels to consoles
  kdb: Fix off by one error in kdb_cpu()
  kdb: fix incorrect counts in KDB summary command output

1 files changed, 18 insertions, 1 deletions

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 07ce18ca71e0..0874e2edd275 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -604,7 +604,7 @@ return_normal:
                    online_cpus)
                 cpu_relax();
         if (!time_left)
-                pr_crit("KGDB: Timed out waiting for secondary CPUs.\n");
+                pr_crit("Timed out waiting for secondary CPUs.\n");
 
         /*
          * At this point the primary processor is completely
@@ -696,6 +696,14 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
 
         if (arch_kgdb_ops.enable_nmi)
                 arch_kgdb_ops.enable_nmi(0);
+        /*
+         * Avoid entering the debugger if we were triggered due to an oops
+         * but panic_timeout indicates the system should automatically
+         * reboot on panic. We don't want to get stuck waiting for input
+         * on such systems, especially if its "just" an oops.
+         */
+        if (signo != SIGTRAP && panic_timeout)
+                return 1;
 
         memset(ks, 0, sizeof(struct kgdb_state));
         ks->cpu                 = raw_smp_processor_id();
@@ -828,6 +836,15 @@ static int kgdb_panic_event(struct notifier_block *self,
                             unsigned long val,
                             void *data)
 {
+        /*
+         * Avoid entering the debugger if we were triggered due to a panic
+         * We don't want to get stuck waiting for input from user in such case.
+         * panic_timeout indicates the system should automatically
+         * reboot on panic.
+         */
+        if (panic_timeout)
+                return NOTIFY_DONE;
+
         if (dbg_kdb_mode)
                 kdb_printf("PANIC: %s\n", (char *)data);
         kgdb_breakpoint();