Re: Reduce struct page by 8 bytes on 64bit

[Andi Kleen]

On Wed, Apr 16, 2003 at 04:26:38PM +0200, David S. Miller wrote:
>    From: Andi Kleen <[e-mail]>
>    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