From 769fdf83df57b373660343ef4270b3ada91ef434 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 6 Oct 2021 10:12:05 +0200
Subject: [PATCH] sched: Fix DEBUG && !SCHEDSTATS warn
Git-commit: 769fdf83df57b373660343ef4270b3ada91ef434
Patch-mainline: v5.16-rc1
References: git-fixes

When !SCHEDSTATS schedstat_enabled() is an unconditional 0 and the
whole block doesn't exist, however GCC figures the scoped variable
'stats' is unused and complains about it.

Upgrade the warning from -Wunused-variable to -Wunused-but-set-variable
by writing it in two statements. This fixes the build because the new
warning is in W=1.

Given that whole if(0) {} thing, I don't feel motivated to change
things overly much and quite strongly feel this is the compiler being
daft.

Fixes: cb3e971c435d ("sched: Make struct sched_statistics independent of fair sched class")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbecker@suse.com>
---
 kernel/sched/debug.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 26fac5e28bc0..7dcbaa31c5d9 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -463,7 +463,8 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group
 	PN(se->sum_exec_runtime);
 
 	if (schedstat_enabled()) {
-               struct sched_statistics *stats =  __schedstats_from_se(se);
+		struct sched_statistics *stats;
+		stats = __schedstats_from_se(se);
 
 		PN_SCHEDSTAT(wait_start);
 		PN_SCHEDSTAT(sleep_start);
-- 
2.34.1