linux-kernel - Re: [PATCH v2 10/10] mm: remove SWAP

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Message-ID: <20170316044023.GA2597@jagdpanzerIV.localdomain>
Date:   Thu, 16 Mar 2017 13:40:23 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@....com, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 10/10] mm: remove SWAP_[SUCCESS|AGAIN|FAIL]

Hello,


On (03/15/17 14:24), Minchan Kim wrote:
> There is no user for it. Remove it.
> 

there is one.

mm/rmap.c

try_to_unmap_one()
...
	if (unlikely(PageSwapBacked(page) != PageSwapCache(page))) {
		WARN_ON_ONCE(1);
		ret = SWAP_FAIL;
		page_vma_mapped_walk_done(&pvmw);
		break;
	}

	-ss