[PATCH -next] x86: Fix unused variable 'hi'

From: Xu Yihang
Date: Sun Mar 21 2021 - 23:55:46 EST


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 stores on bit 31:0 and HV_X64_MSR_TPR stores in bit 7:0, which means higher 32 bits are not really used, therefore __maybe_unused added.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Xu Yihang <xuyihang@xxxxxxxxxx>
---
arch/x86/hyperv/hv_apic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index 284e73661a18..c0b0a5774f31 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -55,7 +55,8 @@ static void hv_apic_icr_write(u32 low, u32 id)

static u32 hv_apic_read(u32 reg)
{
- u32 reg_val, hi;
+ u32 hi __maybe_unused;
+ u32 reg_val;

switch (reg) {
case APIC_EOI:
--
2.17.1