linux-kernel - Re: [PATCH EDACv16 1/2] edac: Change internal representation to work with layers

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Date:	Mon, 30 Apr 2012 14:51:22 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aristeu Rozanski <arozansk@...hat.com>,
	Doug Thompson <norsk5@...oo.com>,
	Mark Gross <mark.gross@...el.com>,
	Jason Uhlenkott <juhlenko@...mai.com>,
	Tim Small <tim@...tersideup.com>,
	Ranganathan Desikan <ravi@...ztechnologies.com>,
	"Arvind R." <arvino55@...il.com>, Olof Johansson <olof@...om.net>,
	Egor Martovetsky <egor@...emi.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Michal Marek <mmarek@...e.cz>, Jiri Kosina <jkosina@...e.cz>,
	Joe Perches <joe@...ches.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Hitoshi Mitake <h.mitake@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Niklas Söderlund 
	<niklas.soderlund@...csson.com>,
	Shaohui Xie <Shaohui.Xie@...escale.com>,
	Josh Boyer <jwboyer@...il.com>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH EDACv16 1/2] edac: Change internal representation to work
 with layers

On Mon, Apr 30, 2012 at 08:23:42AM -0300, Mauro Carvalho Chehab wrote:
> With this I fully agree: you're nacking patches because it is not the way you

Where? Have I written Nacked-by somewhere?

> write your code, not because the code there is doing anything wrong.
> 
> If you point anything wrong on the way I wrote, then I'll fix. Otherwise, why
> should I do a change that will obfuscate the code?

What obfuscation are you talking about? Having the initialization of
variables along with their declaration is not it.

Now let's look what you're doing:

> >> +     unsigned tot_csrows, tot_channels, tot_errcount = 0;
> >> +     unsigned size, tot_dimms, count, pos[EDAC_MAX_LAYERS];

just to reassign 1 to some of them

> >> +     tot_dimms = 1;
> >> +     tot_channels = 1;
> >> +     tot_csrows = 1;

a couple of lines below.

Now this is misleading.

Now let's look at what I'm proposing

	unsigned tot_dimms = 1;
	unsigned tot_csrows = 1;
	unsigned tot_channels = 1;

How is this an obfuscation? It is basic code layout practices.

> The editor used by te developer is not relevant. This is not a reason
> to obfuscate the code.
> 
> >> +struct mem_ctl_info *new_edac_mc_alloc(unsigned edac_index,
> >> +                                    unsigned n_layers,
> >> +                                    struct edac_mc_layer *layers,
> >> +                                    bool rev_order,
> >> +                                    unsigned sz_pvt)
> >>  {
> >>       void *ptr = NULL;
> >>       struct mem_ctl_info *mci;
> >> -     struct csrow_info *csi, *csrow;
> >> +     struct edac_mc_layer *layer;
> >> +     struct csrow_info *csi, *csr;
> >>       struct rank_info *chi, *chp, *chan;
> >>       struct dimm_info *dimm;
> >> +     u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
> >>       void *pvt;
> >> -     unsigned size;
> >> -     int row, chn;
> >> +     unsigned size, tot_dimms, count, pos[EDAC_MAX_LAYERS];
> >> +     unsigned tot_csrows, tot_channels, tot_errcount = 0;
> >> +     int i, j;
> >>       int err;
> >> +     int row, chn;
> >> +     bool per_rank = false;
> >> +
> >> +     BUG_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0);
> >> +     /*
> >> +      * Calculate the total amount of dimms and csrows/cschannels while
> >> +      * in the old API emulation mode
> >> +      */
> >> +     tot_dimms = 1;
> >> +     tot_channels = 1;
> >> +     tot_csrows = 1;
> >> +     for (i = 0; i < n_layers; i++) {
> >> +             tot_dimms *= layers[i].size;
> >> +             if (layers[i].is_virt_csrow)
> >> +                     tot_csrows *= layers[i].size;
> >> +             else
> >> +                     tot_channels *= layers[i].size;
> >> +
> >> +             if (layers[i].type == EDAC_MC_LAYER_CHIP_SELECT)
> >> +                     per_rank = true;

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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