linux-kernel - Re: [RFC v4][PATCH 5/9] Memory managemnet (restore)

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Message-Id: <1221075083.6781.34.camel@nimitz>
Date:	Wed, 10 Sep 2008 12:31:23 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	containers@...ts.linux-foundation.org, jeremy@...p.org,
	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [RFC v4][PATCH 5/9] Memory managemnet (restore)

On Tue, 2008-09-09 at 03:42 -0400, Oren Laadan wrote:
> +/**
> + * cr_vma_read_pages_vaddrs - read addresses of pages to page-array chain
> + * @ctx - restart context
> + * @npages - number of pages
> + */
> +static int cr_vma_read_pages_vaddrs(struct cr_ctx *ctx, int npages)
> +{
> +	struct cr_pgarr *pgarr;
> +	int nr, ret;
> +
> +	while (npages) {
> +		pgarr = cr_pgarr_prep(ctx);
> +		if (!pgarr)
> +			return -ENOMEM;
> +		nr = min(npages, (int) pgarr->nr_free);
> +		ret = cr_kread(ctx, pgarr->vaddrs, nr * sizeof(unsigned long));
> +		if (ret < 0)
> +			return ret;
> +		pgarr->nr_free -= nr;
> +		pgarr->nr_used += nr;
> +		npages -= nr;
> +	}
> +	return 0;
> +}

cr_pgarr_prep() can return a partially full pgarr, right?  Won't the
cr_kread() always start at the beginning of the pgarr->vaddrs[] array?
Seems to me like it will clobber things from the last call.

-- Dave

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