linux-kernel - Re: [PATCH v2 2/4] x86: pmc_atom: print index of device in loop

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Message-ID: <1421919649.31903.123.camel@linux.intel.com>
Date:	Thu, 22 Jan 2015 11:40:49 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	x86@...nel.org, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	"Kumar P, Mahesh" <mahesh.kumar.p@...el.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 2/4] x86: pmc_atom: print index of device in loop

On Thu, 2015-01-22 at 11:45 +0800, Li, Aubrey wrote:
> On 2015/1/21 5:50, Andy Shevchenko wrote:
> > The register mapping may change from one platform to another. Thus, indices
> > might be not the same on different platforms. The patch makes the code to print
> > the device index dynamically at run time.
> 
> Will another platform use the same table but different bit position? In
> my opinion, different platform should use different mapping table.

Yes, indeed.

The only improvement I could suggest now is to use indices for bit field
name from one array of possible names.

Or use macro to fill the item like 
#define BIT_X(bitname) { .name = __stringify(bitname), .bit_mask = BIT_
## bitname, }


> > 
> > The patch also changes the for loop to iterate over the map until a terminator
> > is found.
> 
> Why do we need to do this? did you see any hurt from the existing
> implementation?

Just a micro optimization plus it allows in consequent patches to avoid
size members in the pmc_reg_map.

-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy

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