LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Pavel Machek <pavel@ucw.cz>
To: "Huang, Ying" <ying.huang@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	nigel@nigel.suspend2.net,
	Andrew Morton <akpm@linux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@cmu.edu>,
	linux-kernel@vger.kernel.org,
	linux-pm@lists.linux-foundation.org,
	Kexec Mailing List <kexec@lists.infradead.org>
Subject: Re: [RFC][PATCH 2/2 -mm] kexec based hibernation: kexec restore
Date: Mon, 27 Aug 2007 23:31:34 +0200	[thread overview]
Message-ID: <20070827213134.GE3398@elf.ucw.cz> (raw)
In-Reply-To: <1188177296.3247.38.camel@caritas-dev.intel.com>

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@intel.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 memory corresponding to the old kernel.
> + */
> +static ssize_t write_oldmem(struct file *file, const char __user *buf,
> +			    size_t count, loff_t *ppos)
> +{
> +	unsigned long pfn, offset;
> +	size_t write = 0, csize;
> +	int rc = 0;
> +
> +	while (count) {
> +		pfn = *ppos / PAGE_SIZE;
> +		if (pfn > saved_max_pfn)
> +			return write;
> +
> +		offset = (unsigned long)(*ppos % PAGE_SIZE);
> +		if (count > PAGE_SIZE - offset)
> +			csize = PAGE_SIZE - offset;
> +		else
> +			csize = count;
> +		rc = write_oldmem_page(pfn, buf, csize, offset, 1);
> +		if (rc < 0)
> +			return rc;
> +		buf += csize;
> +		*ppos += csize;
> +		write += csize;
> +		count -= csize;
> +	}
> +	return write;
> +}

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  reply	other threads:[~2007-08-27 21:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-27  1:14 Huang, Ying
2007-08-27 21:31 ` Pavel Machek [this message]
2007-08-28  1:14   ` Huang, Ying
2007-08-29 15:15     ` Pavel Machek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20070827213134.GE3398@elf.ucw.cz \
    --to=pavel@ucw.cz \
    --cc=akpm@linux-foundation.org \
    --cc=ebiederm@xmission.com \
    --cc=jbms@cmu.edu \
    --cc=kexec@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@lists.linux-foundation.org \
    --cc=nigel@nigel.suspend2.net \
    --cc=ying.huang@intel.com \
    --subject='Re: [RFC][PATCH 2/2 -mm] kexec based hibernation: kexec restore' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).