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

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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>
This commit is contained in:
Lee Jones 2020-07-15 09:26:29 +01:00 committed by Rafael J. Wysocki
parent 44bd9a30ef
commit e1711f296a
1 changed files with 2 additions and 2 deletions
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4
drivers/cpufreq/acpi-cpufreq.c
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@ -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;