linux-kernel - Re: [PATCH v2] tools/perf: Fix the mask in regs_dump_

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Message-ID: <20160620091931.GD27702@krava>
Date:	Mon, 20 Jun 2016 11:19:31 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Yury Norov <ynorov@...iumnetworks.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...el.com>,
	Wang Nan <wangnan0@...wei.com>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2] tools/perf: Fix the mask in regs_dump__printf and

On Mon, Jun 20, 2016 at 02:14:01PM +0530, Madhavan Srinivasan wrote:

SNIP

> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index e3ce2f34d3ad..76d5006ebcc3 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -412,11 +412,16 @@ static void print_sample_iregs(struct perf_sample *sample,
>  	struct regs_dump *regs = &sample->intr_regs;
>  	uint64_t mask = attr->sample_regs_intr;
>  	unsigned i = 0, r;
> +	unsigned long _mask[sizeof(mask)/sizeof(unsigned long)];
>  
>  	if (!regs)
>  		return;
>  
> -	for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
> +	_mask[0] = mask & ULONG_MAX;
> +	if (sizeof(mask) > sizeof(unsigned long))
> +		_mask[1] = mask >> 32;
> +
> +	for_each_set_bit(r, _mask, sizeof(mask) * 8) {
>  		u64 val = regs->regs[i++];
>  		printf("%5s:0x%"PRIx64" ", perf_reg_name(r), val);
>  	}
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 5214974e841a..2eaa42a4832a 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -940,8 +940,13 @@ static void branch_stack__printf(struct perf_sample *sample)
>  static void regs_dump__printf(u64 mask, u64 *regs)
>  {
>  	unsigned rid, i = 0;
> +	unsigned long _mask[sizeof(mask)/sizeof(unsigned long)];
>  
> -	for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
> +	_mask[0] = mask & ULONG_MAX;
> +	if (sizeof(mask) > sizeof(unsigned long))
> +		_mask[1] = mask >> 32;
> +
> +	for_each_set_bit(rid, _mask, sizeof(mask) * 8) {
>  		u64 val = regs[i++];

could you please move the common code into the function?

thanks,
jirka