linux-kernel - Re: [PATCH 5.4 000/244] 5.4.119-rc1 review

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Date:   Wed, 12 May 2021 10:03:50 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexandru Elisei <alexandru.elisei@....com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Jon Hunter <jonathanh@...dia.com>,
        linux-stable <stable@...r.kernel.org>,
        Pavel Machek <pavel@...x.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Marc Zyngier <maz@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH 5.4 000/244] 5.4.119-rc1 review

On Wed, May 12, 2021 at 06:00:16PM +0100, Alexandru Elisei wrote:
> Hi Naresh,
> 
> Thank you for the report!
> 
> On 5/12/21 5:47 PM, Naresh Kamboju wrote:
> > On Wed, 12 May 2021 at 20:22, Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> >> This is the start of the stable review cycle for the 5.4.119 release.
> >> There are 244 patches in this series, all will be posted as a response
> >> to this one.  If anyone has any issues with these being applied, please
> >> let me know.
> >>
> >> Responses should be made by Fri, 14 May 2021 14:47:09 +0000.
> >> Anything received after that time might be too late.
> >>
> >> The whole patch series can be found in one patch at:
> >>         https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.119-rc1.gz
> >> or in the git tree and branch at:
> >>         git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
> >> and the diffstat can be found below.
> >>
> >> thanks,
> >>
> >> greg k-h
> > Build regression detected.
> >
> >> Alexandru Elisei <alexandru.elisei@....com>
> >>     KVM: arm64: Initialize VCPU mdcr_el2 before loading it
> > stable rc 5.4 arm axm55xx_defconfig builds failed due to these
> > warnings / errors.
> >   - arm (axm55xx_defconfig) with gcc-8,9 and 10 failed
> >
> > arch/arm/kvm/../../../virt/kvm/arm/arm.c: In function 'kvm_vcpu_first_run_init':
> > arch/arm/kvm/../../../virt/kvm/arm/arm.c:582:2: error: implicit
> > declaration of function 'kvm_arm_vcpu_init_debug'; did you mean
> > 'kvm_arm_init_debug'? [-Werror=implicit-function-declaration]
> >   kvm_arm_vcpu_init_debug(vcpu);
> >   ^~~~~~~~~~~~~~~~~~~~~~~
> >   kvm_arm_init_debug
> > cc1: some warnings being treated as errors
> 
> This is my fault, in Linux v5.4 KVM for arm is still around, and there's no
> prototype for the function when compiling for arm. I suspect that's also the case
> for v4.19.
> 

Correct.

Guenter

> I made this change to get it to build:
> 
> $ git diff
> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> index dd03d5e01a94..32564b017ba0 100644
> --- a/arch/arm/include/asm/kvm_host.h
> +++ b/arch/arm/include/asm/kvm_host.h
> @@ -335,6 +335,7 @@ static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu,
> int cpu) {}
>  static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
>  
>  static inline void kvm_arm_init_debug(void) {}
> +static inline void kvm_arm_vcpu_init_debug(struct kvm_vcpu *vcpu) {}
>  static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
>  static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
>  static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
> 
> which matches the stub for kvm_arm_init_debug(). I can spin a patch out of it and
> send it for 5.4 and 4.19. Marc, what do you think?
> 
> Thanks,
> 
> Alex
> 
> >
> >
> > steps to reproduce:
> > --------------------
> > #!/bin/sh
> >
> > # TuxMake is a command line tool and Python library that provides
> > # portable and repeatable Linux kernel builds across a variety of
> > # architectures, toolchains, kernel configurations, and make targets.
> > #
> > # TuxMake supports the concept of runtimes.
> > # See https://docs.tuxmake.org/runtimes/, for that to work it requires
> > # that you install podman or docker on your system.
> > #
> > # To install tuxmake on your system globally:
> > # sudo pip3 install -U tuxmake
> > #
> > # See https://docs.tuxmake.org/ for complete documentation.
> >
> >
> > tuxmake --runtime podman --target-arch arm --toolchain gcc-8 --kconfig
> > axm55xx_defconfig
> >
> > ref:
> > https://builds.tuxbuild.com/1sRT0HOyHnZ8N5ktJmaEcMIQZL0/
> >
> >
> > --
> > Linaro LKFT
> > https://lkft.linaro.org