linux-kernel - Re: [PATCH v2 2/4] gcov: add support for gcc 4.7 gcov format

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Date:	Wed, 18 Sep 2013 14:27:05 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Frantisek Hrbata <fhrbata@...hat.com>,
	linux-kernel@...r.kernel.org, jstancek@...hat.com,
	keescook@...omium.org, peter.oberparleiter@...ibm.com,
	rusty@...tcorp.com.au, linux-arch@...r.kernel.org, arnd@...db.de,
	mgahagan@...hat.com, agospoda@...hat.com
Subject: Re: [PATCH v2 2/4] gcov: add support for gcc 4.7 gcov format

On Wed, 2013-09-18 at 14:22 -0700, Andrew Morton wrote:
> On Wed,  4 Sep 2013 16:42:54 +0200 Frantisek Hrbata <fhrbata@...hat.com> wrote:
> > The gcov in-memory format changed in gcc 4.7. The biggest change, which
> > requires this special implementation, is that gcov_info no longer contains
> > array of counters for each counter type for all functions and gcov_fn_info is
> > not used for mapping of function's counters to these arrays(offset). Now each
> > gcov_fn_info contans it's counters, which makes things a little bit easier.
> > 
> > This is heavily based on the previous gcc_3_4.c implementation and patches
> > provided by Peter Oberparleiter. Specially the buffer gcda implementation for
> > iterator.
> 
> A couple of little tweaks:
[]
> +++ a/kernel/gcov/gcc_4_7.c
[]
> @@ -267,8 +266,8 @@ struct gcov_info *gcov_info_dup(struct g
>  	if (!dup->filename)
>  		goto err_free;
>  
> -	dup->functions = kzalloc(sizeof(struct gcov_fn_info *) *
> -			info->n_functions, GFP_KERNEL);
> +	dup->functions = kcalloc(sizeof(struct gcov_fn_info *),
> +				 info->n_functions, GFP_KERNEL);

kcalloc(n, size_t, flags)

	dup->functions = kcalloc(info->n_functions,
				 sizeof(struct gcov_fn_info *), GFP_KERNEL);


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