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

On 2002.12.08 Andrew Morton wrote:

"J.A. Magallon" wrote:

quoted

#define __cacheline_start   struct { } ____cacheline_aligned;

That will generate a warning on faster^Wolder versions of gcc.

mnm:/home/akpm> gcc t2.c
t2.c:11: warning: unnamed struct/union that defines no instances
t2.c:15: warning: unnamed struct/union that defines no instances
mnm:/home/akpm> gcc -v 
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/specs
gcc version 2.95.3 20010315 (release)

And how 'bout this (do not have any gcc oldie available to test):

#define __cacheline_start   union { int :0; } ____cacheline_aligned;

It passes gcc-3.2 -Wall...
I think it's nicer to insert __c_s than to go field by field marking
them...

-- 
J.A. Magallon [off-list ref]      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.20-jam1 (gcc 3.2 (Mandrake Linux 9.1 3.2-4mdk))