Commit e1711f29 authored Jul 15, 2020 by Lee Jones Committed by Rafael J. Wysocki Jul 15, 2020

cpufreq: acpi-cpufreq: Mark 'dummy' variable as __always_unused

If we fail to use a variable, even a 'dummy' one, then the compiler
complains that it is set but not used. We know this is fine, so we
set it as __always_unused to let the compiler know.

Fixes the following W=1 kernel build warning(s):

drivers/cpufreq/acpi-cpufreq.c: In function ‘cpu_freq_read_intel’:
drivers/cpufreq/acpi-cpufreq.c:247:11: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable]
drivers/cpufreq/acpi-cpufreq.c: In function ‘cpu_freq_read_amd’:
drivers/cpufreq/acpi-cpufreq.c:265:11: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 44bd9a30

drivers/cpufreq/acpi-cpufreq.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -244,7 +244,7 @@ static unsigned extract_freq(struct cpufreq_policy *policy, u32 val)

		static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used)
		{
		u32 val, dummy;
		u32 val, dummy __always_unused;

		rdmsr(MSR_IA32_PERF_CTL, val, dummy);
		return val;
		@@ -261,7 +261,7 @@ static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val)

		static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used)
		{
		u32 val, dummy;
		u32 val, dummy __always_unused;

		rdmsr(MSR_AMD_PERF_CTL, val, dummy);
		return val;

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