linux-kernel - Re: [PATCH] arm64: kaslr: Fix build failure with CONFIG_ARCH

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Date:   Thu, 13 Feb 2020 09:17:24 +0000
From:   Will Deacon <will@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: kaslr: Fix build failure with CONFIG_ARCH_RANDOM=n

On Wed, Feb 12, 2020 at 10:24:57PM -0600, Samuel Holland wrote:
> Commit 2e8e1ea88cbc ("arm64: Use v8.5-RNG entropy for KASLR seed")
> introduced unconditional use of arm64-specific functions exported by
> asm/archrandom.h. With CONFIG_ARCH_RANDOM=y, this header is transitively
> included through linux/random.h. However, with CONFIG_ARCH_RANDOM=n,
> this header is not included, and the kernel fails to build.
> 
> Explicitly include asm/archrandom.h so __early_cpu_has_rndr() and
> __arm64_rndr() are always available, even when they are just stubs.
> 
> Fixes: 2e8e1ea88cbc ("arm64: Use v8.5-RNG entropy for KASLR seed")
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
>  arch/arm64/kernel/kaslr.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
> index 53b8a4ee64ff..91a83104c6e8 100644
> --- a/arch/arm64/kernel/kaslr.c
> +++ b/arch/arm64/kernel/kaslr.c
> @@ -11,6 +11,7 @@
>  #include <linux/sched.h>
>  #include <linux/types.h>
>  
> +#include <asm/archrandom.h>
>  #include <asm/cacheflush.h>
>  #include <asm/fixmap.h>
>  #include <asm/kernel-pgtable.h>

Already queued up in arm64 for-next/fixes:

https://fixes.arm64.dev/

Will