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

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Date:	Thu, 19 Sep 2013 11:04:16 +0200
From:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
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, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 2/4] gcov: add support for gcc 4.7 gcov format

On 04.09.2013 16:42, Frantisek Hrbata 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.
> 
> v2: - removed const definition for gcov_fn_info in gcov_info
>     - use vmalloc for counter values in gcov_info_dup
>     - use iter buffer for gcda
> 
> Signed-off-by: Frantisek Hrbata <fhrbata@...hat.com>

The patch is missing an include statement:

  CC      kernel/gcov/gcc_4_7.o
kernel/gcov/gcc_4_7.c: In function gcov_info_dup:
kernel/gcov/gcc_4_7.c:293:4: error: implicit declaration of function vmalloc [-Werror=implicit-function-declaration]
kernel/gcov/gcc_4_7.c:293:20: warning: assignment makes pointer from integer without a cast [enabled by default]

With that added, it compiles and works with gcc 4.3.4 and 4.7.2 on
kernel 3.21-rc1 on s390x.

--- a/kernel/gcov/gcc_4_7.c
+++ b/kernel/gcov/gcc_4_7.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/seq_file.h>
+#include <linux/vmalloc.h>
 #include "gcov.h"

 #define GCOV_COUNTERS			8

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