linux-kernel - Re: [PATCH] cgroup: Use lld instead of ld when printing pids controller events

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Date:	Tue, 21 Jun 2016 15:09:33 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Kenny Yu <kennyyu@...com>
Cc:	lizefan@...wei.com, hannes@...xchg.org, cyphar@...har.com,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH] cgroup: Use lld instead of ld when printing pids
 controller events_limit

Hello,

Added (s64) cast because atomic64 switches between l and ll.  No idea
why it doesn't just use s64.

Thanks.

------ 8< ------
>From 9f6870dd9790dd87da1d0cf9e43e60113f3a278d Mon Sep 17 00:00:00 2001
From: Kenny Yu <kennyyu@...com>
Date: Tue, 21 Jun 2016 11:55:35 -0700
Subject: [PATCH] cgroup: Use lld instead of ld when printing pids controller
 events_limit

The `events_limit` variable needs to be formatted with %lld and not %ld.
This fixes the following warning discovered by kbuild test robot:

   kernel/cgroup_pids.c: In function 'pids_events_show':
   kernel/cgroup_pids.c:313:24: warning: format '%ld' expects argument of type
   'long int', but argument 3 has type 'long long int' [-Wformat=]
        seq_printf(sf, "max %ld\n", atomic64_read(&pids->events_limit));
                                   ^

tj: Added explicit (s64) cast as atomic64 switches between long long
    and long depending on 32 or 64.

Signed-off-by: Kenny Yu <kennyyu@...com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/cgroup_pids.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup_pids.c b/kernel/cgroup_pids.c
index 9740ea6..2bd6737 100644
--- a/kernel/cgroup_pids.c
+++ b/kernel/cgroup_pids.c
@@ -310,7 +310,7 @@ static int pids_events_show(struct seq_file *sf, void *v)
 {
 	struct pids_cgroup *pids = css_pids(seq_css(sf));
 
-	seq_printf(sf, "max %ld\n", atomic64_read(&pids->events_limit));
+	seq_printf(sf, "max %lld\n", (s64)atomic64_read(&pids->events_limit));
 	return 0;
 }
 
-- 
2.7.4