linux-kernel - [PATCH 2/2] x86/timers: Make recalibrate_cpu

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Date:   Fri, 14 Jul 2017 11:34:07 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <mingo@...nel.org>, <hpa@...or.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [PATCH 2/2] x86/timers: Make recalibrate_cpu_khz() void

recalibrate_cpu_khz() is called from powernow K7 and Pentium 4/Xeon
CPU freq driver. It recalibrates cpu frequency in case of SMP = n
and doesn't need to return anything.

Mark it void, also remove the #else branch.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/include/asm/timer.h | 2 +-
 arch/x86/kernel/tsc.c        | 8 ++------
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/timer.h b/arch/x86/include/asm/timer.h
index 2016962..e90edbe 100644
--- a/arch/x86/include/asm/timer.h
+++ b/arch/x86/include/asm/timer.h
@@ -8,7 +8,7 @@
 #define TICK_SIZE (tick_nsec / 1000)
 
 unsigned long long native_sched_clock(void);
-extern int recalibrate_cpu_khz(void);
+extern void recalibrate_cpu_khz(void);
 
 extern int no_timer_check;
 
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index c173dce..896dbe3 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -812,13 +812,13 @@ unsigned long native_calibrate_cpu(void)
 	return tsc_pit_min;
 }
 
-int recalibrate_cpu_khz(void)
+void recalibrate_cpu_khz(void)
 {
 #ifndef CONFIG_SMP
 	unsigned long cpu_khz_old = cpu_khz;
 
 	if (!boot_cpu_has(X86_FEATURE_TSC))
-		return -ENODEV;
+		return;
 
 	cpu_khz = x86_platform.calibrate_cpu();
 	tsc_khz = x86_platform.calibrate_tsc();
@@ -828,10 +828,6 @@ int recalibrate_cpu_khz(void)
 		cpu_khz = tsc_khz;
 	cpu_data(0).loops_per_jiffy = cpufreq_scale(cpu_data(0).loops_per_jiffy,
 						    cpu_khz_old, cpu_khz);
-
-	return 0;
-#else
-	return -ENODEV;
 #endif
 }
 
-- 
2.5.5