linux-kernel - Re: [RFC][PATCH 2/2 -mm] kexec based hibernation: kexec restore

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Date:	Tue, 28 Aug 2007 09:14:37 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	nigel@...el.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [RFC][PATCH 2/2 -mm] kexec based hibernation: kexec restore

On Mon, 2007-08-27 at 23:31 +0200, Pavel Machek wrote:
> Hi!
> 
> > This patch adds writing support for /dev/oldmem. This is used to
> > restore the memory contents of hibernated system.
> > 
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> 
> > +ssize_t write_oldmem_page(unsigned long pfn, const char *buf,
> > +			  size_t csize, unsigned long offset, int userbuf)
> 
> Hmm, int userbuf is only ever set to one... Does it make sense to have
> write_oldmem_page in the separate file? The onl user is mem.c, perhaps
> it should go there?
> 

write_oldmem_page is kept to be consistent with copy_oldmem_page as much
as possible. The userbuf is used by copy_oldmem_page too, and
write_oldmem_page is in the same file as copy_oldmem_page. I think the
consistence between them is reasonable.

And the copy_oldmem_page/write_oldmem_page is considered to be
architecture dependent. Now, there are different implementations for
copy_oldmem_page on different architectures. So I think the
copy_oldmem_page/write_oldmem_page should be kept in separate file
instead of go mem.c.

Best Regards,
Huang Ying
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