Re: [RFC][PATCH] net drivers and cache alignment

[Jeff Garzik <jgarzik@xxxxxxxxx>]

J.A. Magallon wrote:
> On 2002.12.08 Andrew Morton wrote:
>
> > Jeff Garzik wrote:
> >
> > > David S. Miller wrote:
> > >
> > > > Can't the cacheline_aligned attribute be applied to individual
> > > > struct members?  I remember doing this for thread_struct on
> > > > sparc ages ago.
> > > Looks like it from the 2.4 processor.h code.
> > >
> > > Attached is cut #2.  Thanks for all the near-instant feedback so far :)
> > >  Andrew, does the attached still need padding on SMP?
> What do you all think about this:
>
> #include <stdio.h>
>
> #define CACHE_LINE_SIZE 128
> #define ____cacheline_aligned __attribute__((__aligned__(CACHE_LINE_SIZE)))
>
> #define __cacheline_start   struct { } ____cacheline_aligned;

if you can mark struct members with attributes, as it appears you can, 
there's no need to define a struct.
        Jeff