linux-kernel - Re: [PATCH v2 3/6] EDAC/amd64: Use a macro for iterating over Unified Memory Controllers

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Message-ID: <20190226215327.GH14836@zn.tnic>
Date:   Tue, 26 Feb 2019 22:53:27 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] EDAC/amd64: Use a macro for iterating over
 Unified Memory Controllers

On Tue, Feb 26, 2019 at 05:25:46PM +0000, Ghannam, Yazen wrote:
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> Define and use a macro for looping over the number of Unified Memory
> Controllers.
> 
> No functional change.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
> Link:
> https://lkml.kernel.org/r/20190219202536.15462-2-Yazen.Ghannam@amd.com
> 
> v1->v2:
> * New in V2. Please see comment on Patch 2 V1 at link above.
> 
>  drivers/edac/amd64_edac.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index 0038fcb0b010..c82aafb7246a 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -449,6 +449,9 @@ static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
>  #define for_each_chip_select_mask(i, dct, pvt) \
>  	for (i = 0; i < pvt->csels[dct].m_cnt; i++)
>  
> +#define for_each_umc(i) \
> +	for (i = 0; i < num_umcs; i++)
> +
>  /*
>   * @input_addr is an InputAddr associated with the node given by mci. Return the
>   * csrow that input_addr maps to, or -1 on failure (no csrow claims input_addr).
> @@ -722,7 +725,7 @@ static unsigned long determine_edac_cap(struct amd64_pvt *pvt)
>  	if (pvt->umc) {
>  		u8 i, umc_en_mask = 0, dimm_ecc_en_mask = 0;
>  
> -		for (i = 0; i < num_umcs; i++) {
> +		for_each_umc(i) {

Hmm, maybe I didn't express myself as clearly as I should have, before.
Sorry about that.

But if you sort the patches this way:

1. Add for_each_umc() and convert code to use it
2. add num_umcs and convert for_each_umc() to use it

You won't have to touch the loops twice in patches 2 and 3 and your
diffstat will be a lot smaller.

Makes sense?

Thx.

-- 
Regards/Gruss,
    Boris.

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