Re: spin_lock forgets to clobber memory and other smp fixes [was Re: [patch] waitqueue optimization, 2.4.0-test7]

From: Andrea Arcangeli (andrea@suse.de)
Date: Thu Sep 07 2000 - 12:10:18 EST

On Thu, 7 Sep 2000, Jamie Lokier wrote:

>int *p;
>int func()
>{
> int x;
> x = *p;
> __asm__ __volatile__ ("" : : : "memory");
> x = *p;
> return x;
>}
>

Defintely none difference here (-fstrict-aliasing doesn't change anything
either).

andrea@inspiron:~ > gcc -v
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.2/specs
gcc version 2.95.2 19991024 (release)

Andrea

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

This archive was generated by hypermail 2b29 : Thu Sep 07 2000 - 21:00:30 EST