Subject: Re: [PATCH v2] tools/perf: Fix the mask in regs_dump__printf and

From: Jiri Olsa <[email-masked]>
Date: Mon, 20 Jun 2016 11:19:31 +0200

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