linux-kernel - [PATCH] panic: flush local cache in panic_smp_self

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Message-ID: <BLU436-SMTP223E884D559C8F414A37041BAFB0@phx.gbl>
Date:	Thu, 9 Apr 2015 13:24:39 +0800
From:	Neil Zhang <neilzhang1123@...mail.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, Neil Zhang <neilzhang1123@...mail.com>
Subject: [PATCH] panic: flush local cache in panic_smp_self_stop

Sometimes we will use the memory dump to figure out what has happened.
Flush the local cache is needed to make the memory content be updated.

Signed-off-by: Neil Zhang <neilzhang1123@...mail.com>
---
 kernel/panic.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index 8136ad7..e9457ca 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -23,6 +23,7 @@
 #include <linux/sysrq.h>
 #include <linux/init.h>
 #include <linux/nmi.h>
+#include <asm/cacheflush.h>
 
 #define PANIC_TIMER_STEP 100
 #define PANIC_BLINK_SPD 18
@@ -56,6 +57,8 @@ EXPORT_SYMBOL(panic_blink);
  */
 void __weak panic_smp_self_stop(void)
 {
+	flush_cache_all();
+
 	while (1)
 		cpu_relax();
 }
-- 
1.7.9.5

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