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

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Message-ID: <20070829151508.GA11179@atrey.karlin.mff.cuni.cz>
Date:	Wed, 29 Aug 2007 17:15:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Huang, Ying" <ying.huang@...el.com>
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.

I thought it may have something to do with consistency. ACK on that
one. Perhaps it should be pushed to akpm?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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