linux-kernel - [PATCH AUTOSEL 4.19 110/209] printk: Correct wrong casting

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Date:   Tue, 12 Nov 2019 20:48:46 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     He Zhe <zhe.he@...driver.com>, rostedt@...dmis.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 110/209] printk: Correct wrong casting

From: He Zhe <zhe.he@...driver.com>

[ Upstream commit 51a72ab7372d85c96104e58036f1b49ba11e5d2b ]

log_first_seq and console_seq are 64-bit unsigned integers.
Correct a wrong casting that might cut off the output.

Link: http://lkml.kernel.org/r/1538239553-81805-2-git-send-email-zhe.he@windriver.com
Cc: rostedt@...dmis.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: He Zhe <zhe.he@...driver.com>
[sergey.senozhatsky@...il.com: More descriptive commit message]
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Signed-off-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/printk/printk.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 11d70fd15e706..52390f5a1db11 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2358,8 +2358,9 @@ void console_unlock(void)
 		printk_safe_enter_irqsave(flags);
 		raw_spin_lock(&logbuf_lock);
 		if (console_seq < log_first_seq) {
-			len = sprintf(text, "** %u printk messages dropped **\n",
-				      (unsigned)(log_first_seq - console_seq));
+			len = sprintf(text,
+				      "** %llu printk messages dropped **\n",
+				      log_first_seq - console_seq);
 
 			/* messages are gone, move to first one */
 			console_seq = log_first_seq;
-- 
2.20.1