linux-kernel - Re: [PATCH 7/9] mm: remove the unused MIGRATE_PFN

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Date:   Mon, 29 Jul 2019 16:29:55 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>
CC:     Bharata B Rao <bharata@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <nouveau@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/9] mm: remove the unused MIGRATE_PFN_ERROR flag


On 7/29/19 7:28 AM, Christoph Hellwig wrote:
> We don't use this flag anymore, so remove it.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Ralph Campbell <rcampbell@...dia.com>

> ---
>   include/linux/migrate.h | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index 093d67fcf6dd..229153c2c496 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -167,7 +167,6 @@ static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
>   #define MIGRATE_PFN_LOCKED	(1UL << 2)
>   #define MIGRATE_PFN_WRITE	(1UL << 3)
>   #define MIGRATE_PFN_DEVICE	(1UL << 4)
> -#define MIGRATE_PFN_ERROR	(1UL << 5)
>   #define MIGRATE_PFN_SHIFT	6

The MIGRATE_PFN_SHIFT could be reduced to 5 since it is only used
to make room for the flags.

>   static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
>