linux-kernel - Re: [PATCH] riscv: Fixup compile error with !MMU

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Date:   Wed, 7 Dec 2022 09:32:20 +0000
From:   Conor Dooley <conor@...nel.org>
To:     guoren@...nel.org
Cc:     palmer@...osinc.com, conor.dooley@...rochip.com,
        liaochang1@...wei.com, lizhengyu3@...wei.com,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] riscv: Fixup compile error with !MMU

On Wed, Dec 07, 2022 at 04:11:12AM -0500, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> Current nommu_virt_defconfig can't compile:
> 
> In file included from
> arch/riscv/kernel/crash_core.c:3:
> arch/riscv/kernel/crash_core.c:
> In function 'arch_crash_save_vmcoreinfo':
> arch/riscv/kernel/crash_core.c:8:27:
> error: 'VA_BITS' undeclared (first use in this function)
>     8 |         VMCOREINFO_NUMBER(VA_BITS);
>       |                           ^~~~~~~
> 
> Add MMU dependency for KEXEC_FILE.
> 
> Fixes: 6261586e0c91 ("RISC-V: Add kexec_file support")
> Reported-by: Conor Dooley <conor@...nel.org>

FWIW (but certainly don't resend for this)
s/conor@...nel.org/conor.dooley@...rochip.com

Thanks for the quick fix, there's other issues w/ that config for me,
but this fixed the kexec bits :)
Tested-by: Conor Dooley <conor.dooley@...rochip.com>

> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> ---
>  arch/riscv/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index ef8d66de5f38..91319044fd13 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -496,7 +496,7 @@ config KEXEC_FILE
>  	select KEXEC_CORE
>  	select KEXEC_ELF
>  	select HAVE_IMA_KEXEC if IMA
> -	depends on 64BIT
> +	depends on 64BIT && MMU
>  	help
>  	  This is new version of kexec system call. This system call is
>  	  file based and takes file descriptors as system call argument
> -- 
> 2.36.1
> 

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