linux-kernel - Re: [PATCH 5/6] scs: Remove references to asm/scs.h from core code

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Message-ID: <20200518121558.GF1957@C02TD0UTHF1T.local>
Date:   Mon, 18 May 2020 13:15:58 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@...com>,
        Jann Horn <jannh@...gle.com>, Ard Biesheuvel <ardb@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, kernel-team@...roid.com
Subject: Re: [PATCH 5/6] scs: Remove references to asm/scs.h from core code

On Fri, May 15, 2020 at 06:27:55PM +0100, Will Deacon wrote:
> asm/scs.h is no longer needed by the core code, so remove a redundant
> header inclusion and update the stale Kconfig text.
> 
> Signed-off-by: Will Deacon <will@...nel.org>

With the corruption checks moved out of arch code this looks sound to
me, so modulo my comments on the prior patch, assuming we factor that
out:

Reviewed-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
>  arch/Kconfig | 4 ++--
>  kernel/scs.c | 1 -
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 45dfca9a98d3..2e6f843d87c4 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -537,8 +537,8 @@ config ARCH_SUPPORTS_SHADOW_CALL_STACK
>  	bool
>  	help
>  	  An architecture should select this if it supports Clang's Shadow
> -	  Call Stack, has asm/scs.h, and implements runtime support for shadow
> -	  stack switching.
> +	  Call Stack and implements runtime support for shadow stack
> +	  switching.
>  
>  config SHADOW_CALL_STACK
>  	bool "Clang Shadow Call Stack"
> diff --git a/kernel/scs.c b/kernel/scs.c
> index faf0ecd7b893..222a7a9ad543 100644
> --- a/kernel/scs.c
> +++ b/kernel/scs.c
> @@ -10,7 +10,6 @@
>  #include <linux/scs.h>
>  #include <linux/slab.h>
>  #include <linux/vmstat.h>
> -#include <asm/scs.h>
>  
>  static struct kmem_cache *scs_cache;
>  
> -- 
> 2.26.2.761.g0e0b3e54be-goog
>