From: "Robert P. J. Day" <rpjday@mindspring.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: why does the macro "ZERO_PAGE" take an argument?
Date: Thu, 7 Jun 2007 07:17:56 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0706070715290.14293@localhost.localdomain> (raw)
probably making a fool of myself here, but what is the purpose of
that single argument to the macro "ZERO_PAGE"?
$ grep -r "define ZERO_PAGE" include
include/asm-frv/pgtable.h:#define ZERO_PAGE(vaddr) ({ BUG(); NULL; })
include/asm-frv/pgtable.h:#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
include/asm-v850/pgtable.h:#define ZERO_PAGE(vaddr) ((void *)0x87654321)
include/asm-mips/pgtable.h:#define ZERO_PAGE(vaddr) \
include/asm-blackfin/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(0))
include/asm-parisc/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
include/asm-alpha/pgtable.h:#define ZERO_PAGE(vaddr) (virt_to_page(ZERO_PGE))
...
AFAICT, there are no definitions of that macro that actually use
that argument. is that some kind of historical cruft?
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================
next reply other threads:[~2007-06-07 11:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-07 11:17 Robert P. J. Day [this message]
2007-06-07 11:29 ` Nick Piggin
2007-06-07 11:34 ` Robert P. J. Day
2007-06-07 11:39 ` Satyam Sharma
2007-06-07 11:53 ` Robert P. J. Day
2007-06-07 16:37 ` Ralf Baechle
2007-06-07 18:04 ` H. Peter Anvin
2007-06-07 17:32 ` H. Peter Anvin
2007-06-07 19:29 ` William Lee Irwin III
2007-06-07 21:16 ` H. Peter Anvin
2007-06-08 7:25 ` Robert P. J. Day
2007-06-09 0:49 ` H. Peter Anvin
2007-06-12 2:18 ` Nick Piggin
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