linux-kernel - Re: [PATCH 8/8 linux-next] mm: use SECTION

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Date:   Fri, 2 Dec 2016 11:54:22 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Fabian Frederick <fabf@...net.be>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8 linux-next] mm: use SECTION_MASK where possible

On Fri, Dec 2, 2016 at 11:22 AM, Fabian Frederick <fabf@...net.be> wrote:
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  kernel/memremap.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/memremap.c b/kernel/memremap.c
> index 1bb5eec..8ebf9dd 100644
> --- a/kernel/memremap.c
> +++ b/kernel/memremap.c
> @@ -198,7 +198,7 @@ static void pgmap_radix_release(struct resource *res)
>  {
>         resource_size_t key, align_start, align_size, align_end;
>
> -       align_start = res->start & ~(SECTION_SIZE - 1);
> +       align_start = res->start & SECTION_MASK;
>         align_size = ALIGN(resource_size(res), SECTION_SIZE);
>         align_end = align_start + align_size - 1;
>
> @@ -244,7 +244,7 @@ static void devm_memremap_pages_release(struct device *dev, void *data)
>         }
>
>         /* pages are dead and unused, undo the arch mapping */
> -       align_start = res->start & ~(SECTION_SIZE - 1);
> +       align_start = res->start & SECTION_MASK;
>         align_size = ALIGN(resource_size(res), SECTION_SIZE);
>         arch_remove_memory(align_start, align_size);
>         untrack_pfn(NULL, PHYS_PFN(align_start), align_size);
> @@ -289,7 +289,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
>         int error, nid, is_ram;
>         unsigned long pfn;
>
> -       align_start = res->start & ~(SECTION_SIZE - 1);
> +       align_start = res->start & SECTION_MASK;
>         align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
>                 - align_start;
>         is_ram = region_intersects(align_start, align_size,

This is addressed in the sub-section hotplug series:

"[PATCH 03/11] mm: introduce common definitions for the size and mask
of a section"
https://lkml.org/lkml/2016/12/1/746