linux-kernel - Re: [PATCH] arm64/mm: Drop unused restore

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Date:   Thu, 17 Nov 2022 12:53:24 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/mm: Drop unused restore_ttbr1

On Thu, Nov 17, 2022 at 06:01:44PM +0530, Anshuman Khandual wrote:
> restore_ttbr1 procedure is not used anywhere, hence just drop it.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

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

Mark.

> ---
> This applies on v6.1-rc5
> 
>  arch/arm64/include/asm/assembler.h | 11 -----------
>  1 file changed, 11 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
> index e5957a53be39..f13bc52ab347 100644
> --- a/arch/arm64/include/asm/assembler.h
> +++ b/arch/arm64/include/asm/assembler.h
> @@ -619,17 +619,6 @@ alternative_endif
>  #endif
>  	.endm
>  
> -/*
> - * Perform the reverse of offset_ttbr1.
> - * bic is used as it can cover the immediate value and, in future, won't need
> - * to be nop'ed out when dealing with 52-bit kernel VAs.
> - */
> -	.macro	restore_ttbr1, ttbr
> -#ifdef CONFIG_ARM64_VA_BITS_52
> -	bic	\ttbr, \ttbr, #TTBR1_BADDR_4852_OFFSET
> -#endif
> -	.endm
> -
>  /*
>   * Arrange a physical address in a TTBR register, taking care of 52-bit
>   * addresses.
> -- 
> 2.25.1
>