linux-kernel - Re: [GIT PULL] perf/core for v5.17

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Date:   Tue, 11 Jan 2022 21:21:16 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] perf/core for v5.17

On Tue, Jan 11, 2022, Borislav Petkov wrote:
>       KVM: Move x86's perf guest info callbacks to generic KVM

This commit, e1bfc24577cc, introduces a new warning on arm64 with CONFIG_GUEST_PERF_EVENTS=n.

  >> arch/arm64/kvm/arm.c:499:15: warning: no previous prototype for function 'kvm_arch_vcpu_get_ip' [-Wmissing-prototypes]
     unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)

I floated a potential fix[*], but we all lost track of it.  I assume the easiest
solution at this point is to post a proper patch to go on top?

---
 arch/arm64/kvm/arm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 8129ee1ed3a4..e3b46951a92d 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -496,10 +496,12 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
 	return vcpu_mode_priv(vcpu);
 }

+#ifdef CONFIG_GUEST_PERF_EVENTS
 unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
 {
 	return *vcpu_pc(vcpu);
 }
+#endif

 /* Just ensure a guest exit from a particular CPU */
 static void exit_vm_noop(void *info)
--

[*] https://lore.kernel.org/all/YZvysKFSLTxDzaBs@google.com/