linux-kernel - Re: [PATCH] mm: extend zero pages to same element pages for zram

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Message-ID: <20170123062621.GB12833@bombadil.infradead.org>
Date:   Sun, 22 Jan 2017 22:26:21 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     zhouxianrong <zhouxianrong@...wei.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, sergey.senozhatsky@...il.com,
        minchan@...nel.org, ngupta@...are.org, Mi.Sophia.Wang@...wei.com,
        zhouxiyu@...wei.com, weidu.du@...wei.com, zhangshiming5@...wei.com,
        won.ho.park@...wei.com
Subject: Re: [PATCH] mm: extend zero pages to same element pages for zram

On Sun, Jan 22, 2017 at 10:58:38AM +0800, zhouxianrong wrote:
> 1. memset is just set a int value but i want to set a long value.

memset doesn't set an int value.

DESCRIPTION
       The  memset()  function  fills  the  first  n  bytes of the memory area
       pointed to by s with the constant byte c.

It sets a byte value.  K&R just happened to choose 'int' as the type
to store that "unsigned char" in.  Probably for very good reasons which
make absolutely no sense today.