linux-kernel - Re: edac/i7300_edac.c:307: strange macro ?

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Date:   Thu, 26 Jan 2017 06:57:44 -0200
From:   Mauro Carvalho Chehab <mchehab@....samsung.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     David Binderman <dcb314@...mail.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: edac/i7300_edac.c:307: strange macro ?

Em Wed, 25 Jan 2017 16:37:28 +0100
Borislav Petkov <bp@...en8.de> escreveu:

> On Wed, Jan 25, 2017 at 12:04:04PM +0000, David Binderman wrote:
> > You'll have a very long wait to get a linux patch from me.
> > 
> > I am happy for someone else to invent a patch.  
> 
> Ah ok, I thought you wanted to give it a try and would want me to help
> you with it. :-)
> 
> Anyway, here it is:
> 
> ---
> From: Borislav Petkov <bp@...e.de>
> Date: Wed, 25 Jan 2017 16:08:27 +0100
> Subject: [PATCH] EDAC, i7300: Test for the second channel properly
> 
> REDMEMB[17] is the ECC_Locator bit, which, when set, identifies the
> CS[3:2] as the simbols in error. And thus the second channel.
> 
> The macro computing it was wrong so get rid of it (it was used at one
> place only) and get rid of the conditional too. Generates better code
> this way anyway.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Reported-by: David Binderman <dcb314@...mail.com>

Seems OK to me. Do you want to put it on your tree, or do you
prefer if I put it on mine?

If you prefer to send via your tree:

Reviewed-by: Mauro Carvalho Chehab <mchehab@...pensource.com>


> ---
>  drivers/edac/i7300_edac.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/edac/i7300_edac.c b/drivers/edac/i7300_edac.c
> index 0a912bf6de00..e391f5a716be 100644
> --- a/drivers/edac/i7300_edac.c
> +++ b/drivers/edac/i7300_edac.c
> @@ -304,7 +304,6 @@ static const char *ferr_global_lo_name[] = {
>  #define REDMEMA		0xdc
>  
>  #define REDMEMB		0x7c
> -  #define IS_SECOND_CH(v)	((v) * (1 << 17))
>  
>  #define RECMEMA		0xe0
>    #define RECMEMA_BANK(v)	(((v) >> 12) & 7)
> @@ -483,8 +482,9 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
>  		pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
>  				     REDMEMB, &value);
>  		channel = (branch << 1);
> -		if (IS_SECOND_CH(value))
> -			channel++;
> +
> +		/* Second channel ? */
> +		channel += !!(value & BIT(17));
>  
>  		/* Clear the error bit */
>  		pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,


-- 
Thanks,
Mauro