Re: [PATCH 2/5] perf: Make EVENT_ATTR and EVENT_PTR global

[Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>]

Jiri Olsa [jolsa@redhat.com] wrote:
| On Tue, Dec 18, 2012 at 11:28:02PM -0800, Sukadev Bhattiprolu wrote:
| > 
| > Rename EVENT_ATTR() and EVENT_PTR() PMU_EVENT_ATTR() and PMU_EVENT_PTR().
| > Make them global so they are available to all architectures.
| > 
| > Further to allow architectures flexibility, have PMU_EVENT_PTR() pass in the
| > variable name as a parameter.
| > 
| hi,
| the change looks ok apart from some nits below.
| 
| There' another version of the x86 event attributes change
| I mentioned earlier:
| 
| http://marc.info/?l=linux-kernel&m=135601815224373&w=2
| 
| I'm not sure which one will make it in first, but you
| guys need to sync ;-) CC-ing Andi and Stephane.

One change that would help powerpc (and other architectures) is to move
the 'struct perf_pmu_events_attr' to say, include/linux/perf_event.h.

Each architecture can define EVENT_VAR(), EVENT_PTR() etc as needed.

| 
| thanks,
| jirka
| 

<snip>

| > +struct perf_pmu_events_attr {
| > +	struct device_attribute attr;
| > +	u64 id;
| > +};
| > +
| > +#define PMU_EVENT_PTR(_var)	&_var.attr.attr
| 
| this one seems superfluous as well, could be replaced by '&'

I guess that would encode the assumption that both the 'attr' fields are 
the first in their respective structures. If so, an explicit comment beside
the fields would be useful.

Sukadev