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

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Date:   Mon, 22 Mar 2021 11:02:20 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Xu Yihang <xuyihang@...wei.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        johnny.chenyi@...wei.com
Subject: Re: [PATCH -next] x86: Fix unused variable 'hi'

On Mon, Mar 22, 2021 at 11:54:26AM +0800, Xu Yihang wrote:
> 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@...wei.com>
> Signed-off-by: Xu Yihang <xuyihang@...wei.com>

I slightly modified the commit message and queued it up for hyperv-next.
Thanks.

Wei.