linux-kernel - [PATCH v1 1/1] x86/kvm: Fix compilation warning in non-x86

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Date:   Fri, 18 Feb 2022 00:41:00 -0300
From:   Leonardo Bras <leobras@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Leonardo Bras <leobras@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: [PATCH v1 1/1] x86/kvm: Fix compilation warning in non-x86_64 builds

On non-x86_64 builds, the helper gtod_is_based_on_tsc() is defined but
never used, which results in an warning with -Wunused-function, and
becomes an error if -Werror is present.

Add #ifdef so gtod_is_based_on_tsc() is only defined in x86_64 builds.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Leonardo Bras <leobras@...hat.com>
---
 arch/x86/kvm/x86.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ca0fae020961..b389517aa6ed 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2363,10 +2363,12 @@ static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
 	return tsc;
 }
 
+#ifdef CONFIG_X86_64
 static inline int gtod_is_based_on_tsc(int mode)
 {
 	return mode == VDSO_CLOCKMODE_TSC || mode == VDSO_CLOCKMODE_HVCLOCK;
 }
+#endif
 
 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
 {
-- 
2.35.1