[ath9k-devel] [PATCH] ath9k: decrease size of ath9k.ko

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Tue, Mar 02, 2010 at 09:02:44PM -0800, Pavel Roskin wrote:
> On Mon, 2010-03-01 at 23:13 +0800, Ming Lei wrote:
> > -		int valid;
> > -		int valid_single_stream;
> > +		u8 valid;
> > +		u8 valid_single_stream;
> 
> You can use bool instead, and that would give the same size saving while
> being even more descriptive.  I think using bool could be safer, as the
> compiler would be able to detect some misuses and the values.
> 
> But I could get even more saving by using bool with the field width:
> 
> bool valid:1;
> bool valid_single_stream:1;
> 
> That would place both variables into one byte.  It may be ineffective
> for speed, but it's more effective for storage.
> 
> In my configuration, I get following sizes:
> 
> original (int):    2792138
> your patch (u8):   2790186
> bool:              2790186
> bool (1 bit):      2789218

Or use flags, and use BIT(1), BIT(2), etc for #defines for each stream mode.
Would save even more.

  Luis