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

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Date:   Thu, 16 Mar 2017 14:44:30 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        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]

On (03/16/17 14:33), Minchan Kim wrote:
[..]
> "There is no user for it"
> 
> I was liar so need to be a honest guy.

ha-ha-ha. I didn't say that :)

[..]
> @@ -1414,7 +1414,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
>  			 */
>  			if (unlikely(PageSwapBacked(page) != PageSwapCache(page))) {
>  				WARN_ON_ONCE(1);
> -				ret = SWAP_FAIL;
> +				ret = false;
>  				page_vma_mapped_walk_done(&pvmw);
>  				break;
>  			}


one thing to notice here is that 'ret = false' and 'ret = SWAP_FAIL'
are not the same and must produce different results. `ret' is bool
and SWAP_FAIL was 2. it's return 1 vs return 0, isn't it? so was
there a bug before?

	-ss