linux-kernel - [PATCH] proc: uptime: print 64-bit seconds values

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Message-ID: <20251222174141.39277-1-jaime.saguillo@gmail.com>
Date: Mon, 22 Dec 2025 18:41:41 +0100
From: Jaime Saguillo Revilla <jaime.saguillo@...il.com>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	Jaime Saguillo Revilla <jaime.saguillo@...il.com>
Subject: [PATCH] proc: uptime: print 64-bit seconds values

uptime.tv_sec and idle.tv_sec are time64_t and may exceed unsigned
long on 32-bit kernels. Print them using a 64-bit format to avoid
truncation in /proc/uptime.

Signed-off-by: Jaime Saguillo Revilla <jaime.saguillo@...il.com>
---
 fs/proc/uptime.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index b5343d209381..2b83435ad01e 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -30,10 +30,10 @@ static int uptime_proc_show(struct seq_file *m, void *v)
 
 	idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem);
 	idle.tv_nsec = rem;
-	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
-			(unsigned long) uptime.tv_sec,
+	seq_printf(m, "%lld.%02lu %lld.%02lu\n",
+			(long long) uptime.tv_sec,
 			(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
-			(unsigned long) idle.tv_sec,
+			(long long) idle.tv_sec,
 			(idle.tv_nsec / (NSEC_PER_SEC / 100)));
 	return 0;
 }
-- 
2.43.0