linux-kernel - Re: [PATCH 1/2] perf: Refactor vmlinux_path

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Date:	Thu, 26 Nov 2015 16:44:14 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, borntraeger@...ibm.com,
	yarygin@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	mingo@...hat.com, namhyung@...nel.org, adrian.hunter@...el.com,
	wangnan0@...wei.com, naveen.n.rao@...ux.vnet.ibm.com,
	dsahern@...il.com, jolsa@...nel.org
Subject: Re: [PATCH 1/2] perf: Refactor vmlinux_path_init

Em Wed, Nov 25, 2015 at 05:32:45PM +0100, Ekaterina Tumanova escreveu:
> Refactor vmlinux_path_init function to ease subsequent additions of
> new vmlinux locations.
> 
> Signed-off-by: Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>
> Acked-by: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
> ---
>  tools/perf/util/symbol.c | 64 +++++++++++++++++++++++++-----------------------
>  1 file changed, 33 insertions(+), 31 deletions(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index cd08027..9335088 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1860,24 +1860,43 @@ static void vmlinux_path__exit(void)
>  	zfree(&vmlinux_path);
>  }
>  
> +static const char * const vmlinux_paths[] = {
> +	"vmlinux",
> +	"/boot/vmlinux"
> +};
> +
> +static const char * const vmlinux_paths_upd[] = {
> +	"/boot/vmlinux-%s",
> +	"/usr/lib/debug/boot/vmlinux-%s",
> +	"/lib/modules/%s/build/vmlinux",
> +	"/usr/lib/debug/lib/modules/%s/vmlinux"
> +};
> +
> +static int vmlinux_path__update(const char *new_entry)

Changing this to vmlinux_path__add().

> +{
> +	vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
> +	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> +		return -1;
> +	++vmlinux_path__nr_entries;
> +
> +	return 0;
> +}
> +
>  static int vmlinux_path__init(struct perf_env *env)
>  {
>  	struct utsname uts;
>  	char bf[PATH_MAX];
>  	char *kernel_version;
> +	unsigned int i;
>  
> -	vmlinux_path = malloc(sizeof(char *) * 6);
> +	vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
> +			      ARRAY_SIZE(vmlinux_paths_upd)));
>  	if (vmlinux_path == NULL)
>  		return -1;
>  
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -	++vmlinux_path__nr_entries;
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -	++vmlinux_path__nr_entries;
> +	for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
> +		if (vmlinux_path__update(vmlinux_paths[i]) < 0)
> +			goto out_fail;
>  
>  	/* only try kernel version if no symfs was given */
>  	if (symbol_conf.symfs[0] != 0)
> @@ -1892,28 +1911,11 @@ static int vmlinux_path__init(struct perf_env *env)
>  		kernel_version = uts.release;
>  	}
>  
> -	snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -	++vmlinux_path__nr_entries;
> -	snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
> -		 kernel_version);
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -        ++vmlinux_path__nr_entries;
> -	snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -	++vmlinux_path__nr_entries;
> -	snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
> -		 kernel_version);
> -	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> -	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
> -		goto out_fail;
> -	++vmlinux_path__nr_entries;
> +	for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
> +		snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
> +		if (vmlinux_path__update(bf) < 0)
> +			goto out_fail;
> +	}
>  
>  	return 0;
>  
> -- 
> 2.3.9
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