Re: [2.6.37-rc1] /proc/vmstat failure.

[Wu Fengguang <fengguang.wu@intel.com>]

On Wed, Nov 03, 2010 at 07:11:11PM +0800, Tetsuo Handa wrote:
> Hello.
> 
> "cat /proc/vmstat" triggered below failure.
> 
> BUG: unable to handle kernel paging request at 07c06d16
> IP: [<c050c336>] strnlen+0x6/0x20

It seems that m->private is of type (void *) while the original v is
(unsigned long *). Can be fixed by the following patch.

Thanks,
Fengguang
---
diff --git a/mm/vmstat.c b/mm/vmstat.c
index cd2e42b..42eac4d 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -949,7 +949,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
 	v[PGPGIN] /= 2;		/* sectors -> kbytes */
 	v[PGPGOUT] /= 2;
 #endif
-	return m->private + *pos;
+	return (unsigned long *)m->private + *pos;
 }
 
 static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)