From: Dave Hansen <hansendc@us.ibm.com>
To: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/13] maps#2: Add /proc/kpagemap interface
Date: Thu, 19 Apr 2007 12:06:38 -0700 [thread overview]
Message-ID: <1177009598.12599.152.camel@localhost.localdomain> (raw)
In-Reply-To: <14.469046093@selenic.com>
On Fri, 2007-04-06 at 17:03 -0500, Matt Mackall wrote:
>
> +static ssize_t kpagemap_read(struct file *file, char __user *buf,
> + size_t count, loff_t *ppos)
> +{
...
> + for (; i < 2 * chunk / KPMSIZE; i += 2, pfn++) {
> + ppage = pfn_to_page(pfn);
> + if (!ppage) {
> + page[i] = 0;
> + page[i + 1] = 0;
> + } else {
> + page[i] = ppage->flags;
> + page[i + 1] = atomic_read(&ppage->_count);
> + }
> + }
I think this needs a pfn_valid() check for sparse/discontig systems. I
think we'll oops if we have holes because we don't check pfn_valid()
inside of pfn_to_page().
-- Dave
next prev parent reply other threads:[~2007-04-19 19:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-06 22:03 [PATCH 0/13] maps#2: pagemap, kpagemap, and related cleanups take 2 Matt Mackall
2007-04-06 22:03 ` [PATCH 1/13] maps#2: Uninline some functions in the page walker Matt Mackall
2007-04-06 22:03 ` [PATCH 2/13] maps#2: Eliminate the pmd_walker struct " Matt Mackall
2007-04-06 22:03 ` [PATCH 3/13] maps#2: Remove vma from args " Matt Mackall
2007-04-06 22:03 ` [PATCH 4/13] maps#2: Propagate errors from callback in " Matt Mackall
2007-04-06 22:03 ` [PATCH 5/13] maps#2: Add callbacks for each level to " Matt Mackall
2007-04-06 22:03 ` [PATCH 6/13] maps#2: Move the page walker code to lib/ Matt Mackall
2007-04-11 6:35 ` Nick Piggin
2007-04-11 7:17 ` Andrew Morton
2007-04-11 7:33 ` Nick Piggin
2007-04-11 14:40 ` Matt Mackall
2007-04-12 6:38 ` Nick Piggin
2007-04-17 20:45 ` Matt Mackall
2007-04-17 21:26 ` Permanent Kgdb integration into the kernel - lets get with it Jason Wessel
2007-04-17 22:09 ` Andi Kleen
2007-04-06 22:03 ` [PATCH 7/13] maps#2: Simplify interdependence of /proc/pid/maps and smaps Matt Mackall
2007-04-06 22:03 ` [PATCH 8/13] maps#2: Move clear_refs code to task_mmu.c Matt Mackall
2007-04-06 22:03 ` [PATCH 9/13] maps#2: Regroup task_mmu by interface Matt Mackall
2007-04-06 22:03 ` [PATCH 10/13] maps#2: Make /proc/pid/smaps optional under CONFIG_EMBEDDED Matt Mackall
2007-04-06 22:03 ` [PATCH 11/13] maps#2: Make /proc/pid/clear_refs option " Matt Mackall
2007-04-07 5:41 ` David Rientjes
2007-04-06 22:03 ` [PATCH 12/13] maps#2: Add /proc/pid/pagemap interface Matt Mackall
2007-04-07 6:55 ` Andrew Morton
2007-04-07 16:36 ` Matt Mackall
2007-04-19 19:12 ` Dave Hansen
2007-04-19 19:58 ` Matt Mackall
2007-04-06 22:03 ` [PATCH 13/13] maps#2: Add /proc/kpagemap interface Matt Mackall
2007-04-19 19:06 ` Dave Hansen [this message]
2007-04-19 20:02 ` Matt Mackall
2007-04-19 20:25 ` Dave Hansen
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