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From:   Xu Yihang <xuyihang@huawei.com>
To:     <kys@microsoft.com>, <haiyangz@microsoft.com>,
        <sthemmin@microsoft.com>, <wei.liu@kernel.org>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
        <x86@kernel.org>, <hpa@zytor.com>
CC:     <linux-hyperv@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <xuyihang@huawei.com>, <johnny.chenyi@huawei.com>
Subject: [PATCH -next] x86: Fix unused variable 'hi'
Date:   Mon, 22 Mar 2021 11:54:26 +0800
Message-ID: <20210322035426.71169-2-xuyihang@huawei.com>
In-Reply-To: <20210322035426.71169-1-xuyihang@huawei.com>
References: <20210318074607.124663-1-xuyihang@huawei.com>
 <20210322035426.71169-1-xuyihang@huawei.com>
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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 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@huawei.com>
Signed-off-by: Xu Yihang <xuyihang@huawei.com>
---
 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