linux-kernel - Re: [syzbot ci] Re: Support "generic" CPUID timing leaf as KVM guest and host.

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Message-ID: <b2667c4ebbe5e0da59542d2d9026322bd70c6c6a.camel@infradead.org>
Date: Fri, 15 Aug 2025 16:36:05 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: syzbot ci <syzbot+ci156aec4dff349a40@...kaller.appspotmail.com>, 
 ajay.kaher@...adcom.com, alexey.makhalov@...adcom.com, bp@...en8.de, 
 dave.hansen@...ux.intel.com, graf@...zon.de, hpa@...or.com,
 kvm@...r.kernel.org,  linux-kernel@...r.kernel.org, mingo@...hat.com,
 pbonzini@...hat.com,  seanjc@...gle.com, tglx@...utronix.de,
 vkuznets@...hat.com, x86@...nel.org
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot ci] Re: Support "generic" CPUID timing leaf as KVM
 guest and host.

On Fri, 2025-08-15 at 08:24 -0700, syzbot ci wrote:
> syzbot ci has tested the following series
> 
> [v1] Support "generic" CPUID timing leaf as KVM guest and host.
> https://lore.kernel.org/all/20250814120237.2469583-1-dwmw2@infradead.org
> * [PATCH 1/3] KVM: x86: Restore caching of KVM CPUID base
> * [PATCH 2/3] KVM: x86: Provide TSC frequency in "generic" timing infomation CPUID leaf
> * [PATCH 3/3] x86/kvm: Obtain TSC frequency from CPUID if present
> 
> and found the following issue:
> kernel build error
> 
> Full report is available here:
> https://ci.syzbot.org/series/a9510b1a-8024-41ce-9775-675f5c165e20
> 
> ***
> 
> kernel build error
> 
> tree:      torvalds
> URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base:      dfc0f6373094dd88e1eaf76c44f2ff01b65db851
> arch:      amd64
> compiler:  Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> config:    https://ci.syzbot.org/builds/590edf8b-b2a0-4cbd-a80e-35083fe0988e/config
> 
> arch/x86/kernel/kvm.c:899:30: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
> 
> ***

#syz test:
git://git.infradead.org/users/dwmw2/linux.git f280e5436b3297ebb3ac282faf5559139b097969