linux-kernel - What's the difference between clear_page and clear_page

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Date:	Tue, 18 Nov 2008 19:35:20 +0800
From:	"jidong xiao" <jidong.xiao@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: What's the difference between clear_page and clear_page_c?

Hi, All,

I saw there are clear_page and clear_page_c defined in
arch/x86/lib/clear_page_64.S, but what's the difference between these
two function? In addition, look at below lines copied from
linux-2.6.27-rc2, particularly line 16, is it a typo? I feel it should
be ENDPROC(clear_page_c) other than ENDPROC(clear_page), isn't it??

      4 /*
      5  * Zero a page.
      6  * rdi  page
      7  */
      8         ALIGN
      9 clear_page_c:
     10         CFI_STARTPROC
     11         movl $4096/8,%ecx
     12         xorl %eax,%eax
     13         rep stosq
     14         ret
     15         CFI_ENDPROC
     16 ENDPROC(clear_page)
     17
     18 ENTRY(clear_page)
     19         CFI_STARTPROC
     20         xorl   %eax,%eax
     21         movl   $4096/64,%ecx
     22         .p2align 4
     23 .Lloop:
     24         decl    %ecx
     25 #define PUT(x) movq %rax,x*8(%rdi)
     26         movq %rax,(%rdi)
     27         PUT(1)
     28         PUT(2)
     29         PUT(3)
     30         PUT(4)
     31         PUT(5)
     32         PUT(6)
     33         PUT(7)
     34         leaq    64(%rdi),%rdi
     35         jnz     .Lloop
     36         nop
     37         ret
     38         CFI_ENDPROC
     39 .Lclear_page_end:
     40 ENDPROC(clear_page)

Regards
Jason
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