linux-kernel - Re: [PATCH] arm64/mm: Poison initmem while freeing with free_reserved

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Date:   Tue, 15 Oct 2019 01:49:37 +0100
From:   Will Deacon <will@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/mm: Poison initmem while freeing with
 free_reserved_area()

On Fri, Oct 04, 2019 at 09:53:58AM +0530, Anshuman Khandual wrote:
> Platform implementation for free_initmem() should poison the memory while
> freeing it up. Hence pass across POISON_FREE_INITMEM while calling into
> free_reserved_area(). The same is being followed in the generic fallback
> for free_initmem() and some other platforms overriding it.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>  arch/arm64/mm/init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 45c00a54909c..ea7d38011e83 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -571,7 +571,7 @@ void free_initmem(void)
>  {
>  	free_reserved_area(lm_alias(__init_begin),
>  			   lm_alias(__init_end),
> -			   0, "unused kernel");
> +			   POISON_FREE_INITMEM, "unused kernel");

Acked-by: Will Deacon <will@...nel.org>

Will