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Date:   Mon, 23 Jan 2017 06:32:55 +0000
From:   zhouxianrong <>
To:     Matthew Wilcox <>
CC:     Sergey Senozhatsky <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        Mi Sophia Wang <>,
        Zhouxiyu <>,
        "Duwei (Device OS)" <>,
        "Zhangshiming (Simon, Device OS)" <>,
        Won Ho Park <>
Subject: 答复: [PATCH] mm: extend zero pages to same element pages for zram

Yes, memset's prototype is int but
the implement of arch is unsigned char; for example, in arm64

	.weak memset
	mov	dst, dstin	/* Preserve return value.  */
	and	A_lw, val, #255
	orr	A_lw, A_lw, A_lw, lsl #8
	orr	A_lw, A_lw, A_lw, lsl #16
	orr	A_l, A_l, A_l, lsl #32

发件人: Matthew Wilcox [] 
发送时间: 2017年1月23日 14:26
收件人: zhouxianrong
抄送: Sergey Senozhatsky;;;;;;; Mi Sophia Wang; Zhouxiyu; Duwei (Device OS); Zhangshiming (Simon, Device OS); Won Ho Park
主题: 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.

       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.

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