linux-kernel - Re: [PATCH v2, part3 02/12] mm/ARM64: kill poison_init

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Date:	Sun, 17 Mar 2013 21:46:42 +0000
From:	Will Deacon <will.deacon@....com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2, part3 02/12] mm/ARM64: kill poison_init_mem()

On Sat, Mar 16, 2013 at 05:03:23PM +0000, Jiang Liu wrote:
> Use free_reserved_area() to kill poison_init_mem() on ARM64.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/arm64/mm/init.c |   17 +++--------------
>  1 file changed, 3 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index e58dd7f..b87bdb8 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -197,14 +197,6 @@ void __init bootmem_init(void)
>  	max_pfn = max_low_pfn = max;
>  }
>  
> -/*
> - * Poison init memory with an undefined instruction (0x0).
> - */
> -static inline void poison_init_mem(void *s, size_t count)
> -{
> -	memset(s, 0, count);
> -}
> -
>  #ifndef CONFIG_SPARSEMEM_VMEMMAP
>  static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
>  {
> @@ -386,8 +378,7 @@ void __init mem_init(void)
>  
>  void free_initmem(void)
>  {
> -	poison_init_mem(__init_begin, __init_end - __init_begin);
> -	free_initmem_default(-1);
> +	free_initmem_default(0);

This change looks unrelated to $subject. We should probably just poison with
0 from the outset, when free_initmem_default is introduced.

Will
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