linux-kernel - Re: [EDAC ABI v13 24/25] edac: change the mem allocation scheme to make Documentation/kobject.txt happy

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Date:	Tue, 17 Apr 2012 15:17:47 -0600
From:	Joe Perches <joe@...ches.com>
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>,
	Borislav Petkov <borislav.petkov@....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>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Hitoshi Mitake <h.mitake@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shaohui Xie <Shaohui.Xie@...escale.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [EDAC ABI v13 24/25] edac: change the mem allocation scheme to
 make Documentation/kobject.txt happy

On Mon, 2012-04-16 at 17:38 -0300, Mauro Carvalho Chehab wrote:
> Kernel kobjects have rigid rules: each container object should be
> dynamically allocated, and can't be allocated into a single kmalloc.
> 
> EDAC never obeyed this rule: it has a single malloc function that
> allocates all needed data into a single kzalloc.
> 
> As this is not accepted anymore, change the allocation schema of the
> EDAC *_info structs to enforce this Kernel standard.
[]
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
[]
> @@ -2228,9 +2228,9 @@ static int init_csrows(struct mem_ctl_info *mci)
>  			edac_mode = EDAC_NONE;
>  
>  		for (j = 0; j < pvt->channel_count; j++) {
> -			csrow->channels[j].dimm->mtype = mtype;
> -			csrow->channels[j].dimm->edac_mode = edac_mode;
> -			csrow->channels[j].dimm->nr_pages = nr_pages;
> +			csrow->channels[j]->dimm->mtype = mtype;
> +			csrow->channels[j]->dimm->edac_mode = edac_mode;
> +			csrow->channels[j]->dimm->nr_pages = nr_pages;

It might be better to use an automatic for
	typeof foo dimm = csrow->channels[j]->dimm;
	dimm->mtype = mtype;
	etc...
[]
> @@ -293,39 +286,56 @@ struct mem_ctl_info *edac_mc_alloc(unsigned edac_index,
>  	mci->mem_is_per_rank = per_rank;
>  
>  	/*
> -	 * Fills the csrow struct
> +	 * Alocate and fill the csrow/channels structs
>  	 */
> +	mci->csrows = kzalloc(sizeof(*mci->csrows) * tot_csrows, GFP_KERNEL);

kcalloc

[]
> +		csr->channels = kzalloc(sizeof(*csr->channels) * tot_cschannels,
> +					GFP_KERNEL);

here too

> @@ -391,7 +401,31 @@ struct mem_ctl_info *edac_mc_alloc(unsigned edac_index,
>  
>  	trace_hw_event_init("edac", (unsigned)edac_index);
>  
> +	debugf1("EDAC MCI allocated\n");
>  	return mci;
> +
> +error:
> +	debugf1("Failed to allocate one or more EDAC MCI structs\n");

Generally, it's not necessary to have specific "OOM" messages
as allocations without GFP_NOWARN do dump_stack()s


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