linux-kernel - Re: [PATCH] mm: simplify get_next_ra

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Message-ID: <ceee59a6-b691-8d80-c62b-1b51377d6153@aol.com>
Date:   Sun, 28 Oct 2018 19:05:39 +0800
From:   Gao Xiang <hsiangkao@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH] mm: simplify get_next_ra_size

Hi Matthew,

On 2018/10/28 18:23, Matthew Wilcox wrote:
> On Sun, Oct 28, 2018 at 02:13:26PM +0800, Gao Xiang wrote:
>> It's a trivial simplification for get_next_ra_size and
>> clear enough for humans to understand.
>>
>> It also fixes potential overflow if ra->size(< ra_pages) is too large.
>>
>> Cc: Fengguang Wu <fengguang.wu@...el.com>
>> Signed-off-by: Gao Xiang <hsiangkao@....com>
> 
> Reviewed-by: Matthew Wilcox <willy@...radead.org>
> 
> I also considered what would happen with underflow (passing a 'max'
> less than 16, or less than 2) and it would seem to do the right thing
> in that case.

Yeah, thanks for the review ;)

I also made a simple tester to test this in order to ensure its correctness
and the result shows the same behavior except for the overflowed case.

Thanks,
Gao Xiang

>