linux-kernel - [PATCH] Add a timestamp to the oops header.

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Message-Id: <20220128220406.4058777-1-jmeurin@google.com>
Date:   Fri, 28 Jan 2022 14:04:06 -0800
From:   Jean-Marc Eurin <jmeurin@...gle.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jean-Marc Eurin <jmeurin@...gle.com>
Subject: [PATCH] Add a timestamp to the oops header.

The saved panics in the mtdoops partition now include a timestamp
in the expanded header after the existing sequence number.

This patch depends on patch 2268aeacced1.

Signed-off-by: Jean-Marc Eurin <jmeurin@...gle.com>
---
 drivers/mtd/mtdoops.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 09a26747f490..7f5869c209a8 100644
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -16,6 +16,7 @@
 #include <linux/wait.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/timekeeping.h>
 #include <linux/mtd/mtd.h>
 #include <linux/kmsg_dump.h>
 
@@ -23,7 +24,7 @@
 #define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024)
 
 #define MTDOOPS_KERNMSG_MAGIC 0x5d005d00
-#define MTDOOPS_HEADER_SIZE   8
+#define MTDOOPS_HEADER_SIZE   16
 
 static unsigned long record_size = 4096;
 module_param(record_size, ulong, 0400);
@@ -180,6 +181,7 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
 	size_t retlen;
 	u32 *hdr;
 	int ret;
+	ktime_t ktime = ktime_get_real();
 
 	if (test_and_set_bit(0, &cxt->oops_buf_busy))
 		return;
@@ -188,6 +190,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
 	hdr = cxt->oops_buf;
 	hdr[0] = cxt->nextcount;
 	hdr[1] = MTDOOPS_KERNMSG_MAGIC;
+	hdr[2] = (u32) (ktime >> 32);
+	hdr[3] = (u32) (ktime & 0xffffffff);
 
 	if (panic) {
 		ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
-- 
2.35.0.rc2.247.g8bbb082509-goog