+ kernel-add-panic_on_warn-v9.patch added to -mm tree

+ kernel-add-panic_on_warn-v9.patch added to -mm tree

[akpm]

The patch titled
     Subject: kernel-add-panic_on_warn-v9
has been added to the -mm tree.  Its filename is
     kernel-add-panic_on_warn-v9.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/kernel-add-panic_on_warn-v9.patch
		echo and later at
		echo  http://ozlabs.org/~akpm/mmotm/broken-out/kernel-add-panic_on_warn-v9.patch

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------------------------------------------------------
From: Prarit Bhargava <prarit@redhat.com>
Subject: kernel-add-panic_on_warn-v9

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/panic.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff -puN kernel/panic.c~kernel-add-panic_on_warn-v9 kernel/panic.c
--- a/kernel/panic.c~kernel-add-panic_on_warn-v9
+++ a/kernel/panic.c
@@ -23,7 +23,6 @@
 #include <linux/sysrq.h>
 #include <linux/init.h>
 #include <linux/nmi.h>
-#include <linux/crash_dump.h>
 
 #define PANIC_TIMER_STEP 100
 #define PANIC_BLINK_SPD 18
@@ -422,8 +421,7 @@ static void warn_slowpath_common(const c
 {
 	disable_trace_on_warning();
 
-	if (!panic_on_warn)
-		pr_warn("------------[ cut here ]------------\n");
+	pr_warn("------------[ cut here ]------------\n");
 	pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS()\n",
 		raw_smp_processor_id(), current->pid, file, line, caller);
 
@@ -432,8 +430,10 @@ static void warn_slowpath_common(const c
 
 	if (panic_on_warn) {
 		/*
-		 * A flood of WARN()s may occur.  Prevent further WARN()s
-		 * from panicking the system.
+		 * This thread may hit another WARN() in the panic path.
+		 * Resetting this prevents additional WARN() from panicking the
+		 * system on this thread.  Other threads are blocked by the
+		 * panic_mutex in panic().
 		 */
 		panic_on_warn = 0;
 		panic("panic_on_warn set ...\n");
_

Patches currently in -mm which might be from prarit@redhat.com are

kernel-add-panic_on_warn.patch
kernel-add-panic_on_warn-v7.patch
kernel-add-panic_on_warn-v9.patch
linux-next.patch