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 14:22:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frantisek Hrbata <fhrbata@...hat.com>
Cc:	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,  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~gcov-add-support-for-gcc-47-gcov-format-fix
+++ a/kernel/gcov/gcc_4_7.c
@@ -254,11 +254,10 @@ struct gcov_info *gcov_info_dup(struct g
 	size_t fi_size; /* function info size */
 	size_t cv_size; /* counter values size */
 
-	dup = kmalloc(sizeof(struct gcov_info), GFP_KERNEL);
+	dup = kmemdup(info, sizeof(*dup), GFP_KERNEL);
 	if (!dup)
 		return NULL;
 
-	*dup = *info;
 	dup->next = NULL;
 	dup->filename = NULL;
 	dup->functions = NULL;
@@ -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);
 	if (!dup->functions)
 		goto err_free;
 
_

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