[PATCH] Correct offset_in_page mask bits in function edac_mc_handle_ce.

[Xie Shaohui-B21989]

>-----Original Message-----
>From: Andrew Morton [mailto:akpm at linux-foundation.org]
>Sent: Friday, July 15, 2011 5:51 AM
>To: Xie Shaohui-B21989
>Cc: linuxppc-dev at lists.ozlabs.org; Gala Kumar-B11780; Wood Scott-B07421;
>ptyser at xes-inc.com; djiang at mvista.com; dougthompson at xmission.com; Jiang
>Kai-B18973
>Subject: Re: [PATCH] Correct offset_in_page mask bits in function
>edac_mc_handle_ce.
>
>On Thu, 14 Jul 2011 10:01:42 +0800
>Shaohui Xie <Shaohui.Xie at freescale.com> wrote:
>
>> From: Kai.Jiang <Kai.Jiang at freescale.com>
>>
>> Parameter offset_in_page in function edac_mc_handle_ce should be
>> masked the higher bits above the page size, not the lower bits. The
>> original input sometimes causes crash.
>>
>> Signed-off-by: Kai.Jiang <Kai.Jiang at freescale.com>
>> ---
>>  drivers/edac/mpc85xx_edac.c |    4 ++--
>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c
>> index 38ab8e2..b048a5f 100644
>> --- a/drivers/edac/mpc85xx_edac.c
>> +++ b/drivers/edac/mpc85xx_edac.c
>> @@ -854,11 +854,11 @@ static void mpc85xx_mc_check(struct mem_ctl_info
>*mci)
>>  		mpc85xx_mc_printk(mci, KERN_ERR, "PFN out of range!\n");
>>
>>  	if (err_detect & DDR_EDE_SBE)
>> -		edac_mc_handle_ce(mci, pfn, err_addr & PAGE_MASK,
>> +		edac_mc_handle_ce(mci, pfn, err_addr & ~PAGE_MASK,
>>  				  syndrome, row_index, 0, mci->ctl_name);
>>
>>  	if (err_detect & DDR_EDE_MBE)
>> -		edac_mc_handle_ue(mci, pfn, err_addr & PAGE_MASK,
>> +		edac_mc_handle_ue(mci, pfn, err_addr & ~PAGE_MASK,
>>  				  row_index, mci->ctl_name);
>>
>>  	out_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT, err_detect);
>
>The patch should have had your Signed-off-by:, as described in
>Documentation/SubmittingPatches.  I added your s-o-b to my copy - please
>ack this.
[Xie Shaohui] OK, thank you.

>
>From the description it appears to me that this fix should be backported
>into 2.6.39.x and earlier.  Do you agree?
[Xie Shaohui] Actually this patch was created based on 2.6.32, it can be applied 
to 2.6.39 and 3.0 without any change.

>
>The way to indicate this intention is to add "Cc: <stable at kernel.org>"
>to the changelog.  I added that tag to my copy of this patch.

[Xie Shaohui] OK, thank you.


Best Regards, 
Shaohui Xie