linux-kernel - Re: [PATCH] EDAC, sb_edac: Fixed logic error in sb

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Date:	Mon, 7 Mar 2016 16:24:13 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Hubert Chrzaniuk <hubert.chrzaniuk@...el.com>
Cc:	lukasz.anaczkowski@...el.com, mchehab@....samsung.com,
	dougthompson@...ssion.com, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] EDAC, sb_edac: Fixed logic error in sb_edac driver

On Mon, Mar 07, 2016 at 03:30:45PM +0100, Hubert Chrzaniuk wrote:
> Patch corrects a typo introduced previously.
> As a result under some configurations dimms were not
> correctly recognized. Problem affects only Xeon Phi architecture.
> 
> Signed-off-by: Hubert Chrzaniuk <hubert.chrzaniuk@...el.com>
> ---
>  drivers/edac/sb_edac.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> index e438ee5..f5c6b97 100644
> --- a/drivers/edac/sb_edac.c
> +++ b/drivers/edac/sb_edac.c
> @@ -1574,7 +1574,7 @@ static int knl_get_dimm_capacity(struct sbridge_pvt *pvt, u64 *mc_sizes)
>  				for (cha = 0; cha < KNL_MAX_CHAS; cha++) {
>  					if (knl_get_mc_route(target,
>  						mc_route_reg[cha]) == channel
> -						&& participants[channel]) {
> +						&& !participants[channel]) {
>  						participant_count++;
>  						participants[channel] = 1;
>  						break;
> -- 

Do I see it correctly this one fixes

d0cdf9003140 ("EDAC, sb_edac: Add Knights Landing (Xeon Phi gen 2) support")

and needs to go to Linus now otherwise 4.5 is b0rked on KNL?

On a related note, that knl_get_dimm_capacity() is huuuge and hard to
read and could use some nice cleanups and splitting out functionality
into helper functions...

-- 
Regards/Gruss,
    Boris.

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