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Message-ID: <20240229142248.518723854@linutronix.de>
Date: Thu, 29 Feb 2024 15:23:41 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org,
Steven Rostedt <rostedt@...dmis.org>,
"Paul E. McKenney" <paulmck@...nel.org>
Subject: [patch 5/6] x86/idle: Let prefer_mwait_c1_over_halt() return bool
The return value is truly boolean. Make it so.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/kernel/process.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -853,21 +853,21 @@ void __noreturn stop_this_cpu(void *dumm
* Do not prefer MWAIT if MONITOR instruction has a bug or idle=nomwait
* is passed to kernel commandline parameter.
*/
-static int prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c)
+static bool prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
/* If override is enforced on the command line, fall back to HALT. */
if (boot_option_idle_override != IDLE_NO_OVERRIDE)
- return 0;
+ return false;
/* MWAIT is not supported on this platform. Fallback to HALT */
if (!cpu_has(c, X86_FEATURE_MWAIT))
- return 0;
+ return false;
/* Monitor has a bug or APIC stops in C1E. Fallback to HALT */
if (boot_cpu_has_bug(X86_BUG_MONITOR) || boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E))
- return 0;
+ return false;
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
@@ -876,13 +876,13 @@ static int prefer_mwait_c1_over_halt(con
* with EAX=0, ECX=0.
*/
if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED))
- return 1;
+ return true;
/*
* If MWAIT extensions are available, there should be at least one
* MWAIT C1 substate present.
*/
- return (edx & MWAIT_C1_SUBSTATE_MASK);
+ return !!(edx & MWAIT_C1_SUBSTATE_MASK);
}
/*
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