linux-kernel - [PATCH] x86/smp: Unused value freq

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Date:   Fri, 10 Sep 2021 12:44:05 -0600
From:   Tim Gardner <tim.gardner@...onical.com>
To:     x86@...nel.org
Cc:     tim.gardner@...onical.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Balbir Singh <sblbir@...zon.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86/smp: Unused value freq_scale

Coverity warns of an unused value in arch_scale_freq_tick().

CID 100778 (#1 of 1): Unused value (UNUSED_VALUE)
assigned_value: Assigning value 1024ULL to freq_scale here, but that stored
value is overwritten before it can be used.

e2b0d619b400a ("x86, sched: check for counters overflow in frequency invariant
accounting") introduced this warning.

Fix this by removing the variable initializer.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Giovanni Gherdovich <ggherdovich@...e.cz>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Nathan Fontenot <nathan.fontenot@....com>
Cc: Balbir Singh <sblbir@...zon.com>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 arch/x86/kernel/smpboot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 85f6e242b6b4..c453b825a57f 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -2166,7 +2166,7 @@ DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
 
 void arch_scale_freq_tick(void)
 {
-	u64 freq_scale = SCHED_CAPACITY_SCALE;
+	u64 freq_scale;
 	u64 aperf, mperf;
 	u64 acnt, mcnt;
 
-- 
2.33.0