linux-kernel - Re: [PATCH] vmstat: fix offset calculation on void*

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Date:	Tue,  9 Nov 2010 12:24:49 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	"mrubin@...gle.com" <mrubin@...gle.com>,
	"david@...morbit.com" <david@...morbit.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"nickpiggin@...oo.com.au" <nickpiggin@...oo.com.au>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmstat: fix offset calculation on void*

> Fix regression introduced by commit 79da826aee6.
> 
> 	BUG: unable to handle kernel paging request at 07c06d16
> 	IP: [<c050c336>] strnlen+0x6/0x20
> 
> 	Call Trace:
> 	 [<c050a249>] ? string+0x39/0xe0
> 	 [<c042be6b>] ? __wake_up_common+0x4b/0x80
> 	 [<c050afcc>] ? vsnprintf+0x1ec/0x380
> 	 [<c04b380e>] ? seq_printf+0x2e/0x60
> 	 [<c04829a6>] ? vmstat_show+0x26/0x30
> 	 [<c04b3bb6>] ? seq_read+0xa6/0x380
> 	 [<c04b3b10>] ? seq_read+0x0/0x380
> 	 [<c04d5d2f>] ? proc_reg_read+0x5f/0x90
> 	 [<c049c4a1>] ? vfs_read+0xa1/0x140
> 	 [<c04d5cd0>] ? proc_reg_read+0x0/0x90
> 	 [<c049c981>] ? sys_read+0x41/0x70
> 	 [<c0402bd0>] ? sysenter_do_call+0x12/0x26
> 
> 
> CC: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> CC: Michael Rubin <mrubin@...gle.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
> 
> Hopefully Tetsuo can test it soon, thanks!
> 
>  mm/vmstat.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.orig/mm/vmstat.c	2010-11-04 01:49:12.000000000 +0800
> +++ linux-2.6/mm/vmstat.c	2010-11-04 01:49:23.000000000 +0800
> @@ -949,7 +949,7 @@ static void *vmstat_start(struct seq_fil
>  	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)

Good catch!
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>





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