linux-kernel - [PATCH AUTOSEL 4.4] pstore/ram: Rate-limit "uncorrectable error in header" message

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Date:   Sun,  7 Mar 2021 08:58:29 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4] pstore/ram: Rate-limit "uncorrectable error in header" message

From: Dmitry Osipenko <digetx@...il.com>

[ Upstream commit 7db688e99c0f770ae73e0f1f3fb67f9b64266445 ]

There is a quite huge "uncorrectable error in header" flood in KMSG
on a clean system boot since there is no pstore buffer saved in RAM.
Let's silence the redundant noisy messages by rate-limiting the printk
message. Now there are maximum 10 messages printed repeatedly instead
of 35+.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/r/20210302095850.30894-1-digetx@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/pstore/ram_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 679d75a864d0..40bdf7d85a05 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -236,7 +236,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
 		pr_info("error in header, %d\n", numerr);
 		prz->corrected_bytes += numerr;
 	} else if (numerr < 0) {
-		pr_info("uncorrectable error in header\n");
+		pr_info_ratelimited("uncorrectable error in header\n");
 		prz->bad_blocks++;
 	}
 
-- 
2.30.1