linux-kernel - Re: [PATCH] KVM: arm: add Kbuild FORCE prerequisite for hyp-reloc

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Date:   Mon, 20 Sep 2021 11:08:27 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        David Brazdil <dbrazdil@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Quentin Perret <qperret@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: arm: add Kbuild FORCE prerequisite for hyp-reloc

On 2021-09-20 11:05, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Commit e1f86d7b4b2a ("kbuild: warn if FORCE is missing for
> if_changed(_dep,_rule)
> and filechk") added a helpful check for Kbuild, which now notices
> that a problem with the hyp-reloc rule:
> 
> arch/arm64/kvm/hyp/nvhe/Makefile:58: FORCE prerequisite is missing
> 
> Do as suggested and add FORCE here.
> 
> Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm64/kvm/hyp/nvhe/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile 
> b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 5df6193fc430..8d741f71377f 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -54,7 +54,7 @@ $(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix
> $(obj)/,$(hyp-obj)) FORCE
>  #    runtime. Because the hypervisor is part of the kernel binary, 
> relocations
>  #    produce a kernel VA. We enumerate relocations targeting hyp at 
> build time
>  #    and convert the kernel VAs at those positions to hyp VAs.
> -$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel
> +$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE
>  	$(call if_changed,hyprel)
> 
>  # 5) Compile hyp-reloc.S and link it into the existing partially 
> linked object.

I already have queued [1], which does the same thing.

Thanks,

         M.

[1] https://lore.kernel.org/r/20210907052137.1059-1-yuzenghui@huawei.com
-- 
Jazz is not dead. It just smells funny...