linux-kernel - Re: [PATCH] arm64:free_initrd_mem should also free the memblock

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Date:	Mon, 15 Sep 2014 19:33:34 +0100
From:	Will Deacon <will.deacon@....com>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
Cc:	"'linux@....linux.org.uk'" <linux@....linux.org.uk>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>
Subject: Re: [PATCH] arm64:free_initrd_mem should also free the memblock

On Fri, Sep 12, 2014 at 11:17:18AM +0100, Wang, Yalin wrote:
> this patch fix the memblock statics for memblock
> in file /sys/kernel/debug/memblock/reserved
> if we don't call memblock_free the initrd will still
> be marked as reserved, even they are freed.
> 
> Signed-off-by: Yalin Wang <yalin.wang@...ymobile.com>
> ---
>  arch/arm64/mm/init.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 5472c24..34605c8 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -334,8 +334,10 @@ static int keep_initrd;
>  
>  void free_initrd_mem(unsigned long start, unsigned long end)
>  {
> -	if (!keep_initrd)
> +	if (!keep_initrd) {
>  		free_reserved_area((void *)start, (void *)end, 0, "initrd");
> +		memblock_free(__pa(start), end - start);
> +	}

I don't think it makes any technical difference, but doing the memblock_free
before the free_reserved_area makes more sense to me.

Will
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