linux-kernel - Re: [RFC v6][PATCH 5/9] Restore memory address space

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Message-Id: <1223480145.11830.3.camel@nimitz>
Date:	Wed, 08 Oct 2008 08:35:45 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	jeremy@...p.org, arnd@...db.de,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC v6][PATCH 5/9] Restore memory address space

On Wed, 2008-10-08 at 06:19 -0400, Oren Laadan wrote:
> 
> +static int cr_read_private_vma_contents(struct cr_ctx *ctx)
> +{
> +       struct cr_hdr_pgarr *hh;
> +       unsigned long nr_pages;
> +       int parent, ret = 0;
> +
> +       while (1) {
> +               hh = cr_hbuf_get(ctx, sizeof(*hh));
> +               parent = cr_read_obj_type(ctx, hh, sizeof(*hh), CR_HDR_PGARR);
> +               if (parent != 0) {
> +                       if (parent < 0)
> +                               ret = parent;
> +                       else
> +                               ret = -EINVAL;
> +                       cr_hbuf_put(ctx, sizeof(*hh));
> +                       break;
> +               }
> +
> +               cr_debug("nr_pages %ld\n", (unsigned long) hh->nr_pages);
> +
> +               nr_pages = hh->nr_pages;
> +               cr_hbuf_put(ctx, sizeof(*hh));
> +
> +               if (!nr_pages)
> +                       break;
> +
> +               ret = cr_read_pages_vaddrs(ctx, nr_pages);
> +               if (ret < 0)
> +                       break;
> +               ret = cr_read_pages_contents(ctx);
> +               if (ret < 0)
> +                       break;
> +               cr_pgarr_reset_all(ctx);
> +       }
> +
> +       return ret;
> +}

This basically just uses a while(1) loop with 'break' instead of an
'out_err:' label and some gotos.  That's kinda odd for the kernel.  

-- Dave

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