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DateSun, 18 Oct 1998 16:24:52 +0200 (CEST)
FromAndrea Arcangeli <>
SubjectRe: [patch] jiffies wraparound [Re: 2.1.125 Show stopper list: Draft]
On Sun, 18 Oct 1998, David S. Miller wrote:

> I think that using a bitwise flag (use_timeout) could eventually
> also improve performance because when the timeout expire we don' t
> need to set to 0 a 64 bit memory area on 64bit arch. I am not 100%
> sure though ;-).
>
>On most RISC machines, bitfield extract/store is implemented as word
^^^^

I guess that there are not asm instruction for bitwise memory accesses.
Word means 32 or 64 bit (->timeout is a 64 bit memory area)? I have no
cross compier to check the output asm here.

>memory operations with the bit twiddle in the register. This is
>actually specified by the ABI, sparc64 and alpha do this for example.

ABI ??

Andrea Arcangeli


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