linux-kernel - Re: [PATCH] arm64: remove dead code

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Date:	Fri, 17 Jul 2015 08:49:25 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Mark Salter <msalter@...hat.com>,
	Geoff Levand <geoff.levand@...aro.org>,
	Takahiro Akashi <takahiro.akashi@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: remove dead code

(adding Geoff and Takahiro)

On 16 July 2015 at 19:58, Mark Salter <msalter@...hat.com> wrote:
> Commit 68234df4ea79 ("arm64: kill flush_cache_all()") removed
> soft_reset() from the kernel. This was the only caller of
> setup_mm_for_reboot(), so remove that also.
>

I am wondering if setup_mm_for_reboot() is being used in the kexec
patches. Perhaps we should check that before removing it.

Geoff?


> Signed-off-by: Mark Salter <msalter@...hat.com>
> ---
>  arch/arm64/include/asm/mmu.h |  1 -
>  arch/arm64/mm/mmu.c          | 11 -----------
>  2 files changed, 12 deletions(-)
>
> diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
> index 79fcfb0..0302087 100644
> --- a/arch/arm64/include/asm/mmu.h
> +++ b/arch/arm64/include/asm/mmu.h
> @@ -28,7 +28,6 @@ typedef struct {
>  #define ASID(mm)       ((mm)->context.id & 0xffff)
>
>  extern void paging_init(void);
> -extern void setup_mm_for_reboot(void);
>  extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
>  extern void init_mem_pgprot(void);
>  extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index a4ede4e..63012fe 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -461,17 +461,6 @@ void __init paging_init(void)
>  }
>
>  /*
> - * Enable the identity mapping to allow the MMU disabling.
> - */
> -void setup_mm_for_reboot(void)
> -{
> -       cpu_set_reserved_ttbr0();
> -       flush_tlb_all();
> -       cpu_set_idmap_tcr_t0sz();
> -       cpu_switch_mm(idmap_pg_dir, &init_mm);
> -}
> -
> -/*
>   * Check whether a kernel address is valid (derived from arch/x86/).
>   */
>  int kern_addr_valid(unsigned long addr)
> --
> 2.4.3
>
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