Re: Reduce struct page by 8 bytes on 64bit

Andi Kleen
2003-04-16T14:31:37Z

On Wed, Apr 16, 2003 at 04:26:38PM +0200, David S. Miller wrote:
> From: Andi Kleen <ak@muc.de>
> Date: Wed, 16 Apr 2003 16:07:15 +0200
>
> How so? Of course I could write an generic set_bit32, but the question
> is if these bit operations would be still atomic on SMP and not conflict with
> fields occuping the same 8 byte slot. I remember you flaming someone
> some time ago because he used set_bit in an atomic fashion on a type smaller
> than unsigned long for example.
>
> It's OK if you align the pointer to 8 bytes, and subsequently the bit
> offset as appropriate. :-)

On sparc64. But is that true too for all other 64bit architectures supported?

e.g. How about PA-RISC? (always seems to do things differently)

-Andi