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x86/hyperv: Fix unused variable 'hi' warning in hv_apic_read

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Fixes the following W=1 kernel build warning(s):
arch/x86/hyperv/hv_apic.c:58:15: warning: variable ‘hi’ set but not used [-Wunused-but-set-variable]

Compiled with CONFIG_HYPERV enabled:
make allmodconfig ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu-
make W=1 arch/x86/hyperv/hv_apic.o ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu-

HV_X64_MSR_EOI occupies bit 31:0 and HV_X64_MSR_TPR occupies bit 7:0,
which means the higher 32 bits are not really used. Cast the variable hi
to void to silence this warning.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Xu Yihang <xuyihang@huawei.com>
Link: https://lore.kernel.org/r/20210323025013.191533-1-xuyihang@huawei.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Xu Yihang 2021-03-23 10:50:13 +08:00 committed by Wei Liu
parent 13c4d4626a
commit 1b60280834
1 changed files with 2 additions and 0 deletions
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2
arch/x86/hyperv/hv_apic.c
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@ -60,9 +60,11 @@ static u32 hv_apic_read(u32 reg)
switch (reg) {
case APIC_EOI:
rdmsr(HV_X64_MSR_EOI, reg_val, hi);
(void)hi;
return reg_val;
case APIC_TASKPRI:
rdmsr(HV_X64_MSR_TPR, reg_val, hi);
(void)hi;
return reg_val;
default: