linux-kernel - Re: [PATCH] mm: cma: fix CMA aligned offset calculation

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Message-ID: <CADtm3G6UcuLmESz+dFmeMfLfJ=SWwkAiHLUHHKxvmjYTvwZRog@mail.gmail.com>
Date:	Tue, 24 Feb 2015 12:54:38 -0800
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Danesh Petigara <dpetigara@...adcom.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	linux-mm@...ck.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: cma: fix CMA aligned offset calculation

[removed stable from cc]

On Tue, Feb 24, 2015 at 11:55 AM, Danesh Petigara
<dpetigara@...adcom.com> wrote:
> diff --git a/mm/cma.c b/mm/cma.c
> index 75016fd..58f37bd 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -70,9 +70,13 @@ static unsigned long cma_bitmap_aligned_offset(struct cma *cma, int align_order)
>
>         if (align_order <= cma->order_per_bit)
>                 return 0;
> -       alignment = 1UL << (align_order - cma->order_per_bit);
> -       return ALIGN(cma->base_pfn, alignment) -
> -               (cma->base_pfn >> cma->order_per_bit);
> +
> +       /*
> +        * Find a PFN aligned to the specified order and return
> +        * an offset represented in order_per_bits.
> +        */
> +       return (ALIGN(cma->base_pfn, (1UL << align_order))
> +               - cma->base_pfn) >> cma->order_per_bit;

It was noticed that this doesn't remove the now-unused 'alignment'
variable, so I think Danesh is planning to submit an updated patch.

Best regards,
Gregory
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