On Fri, 01 May 2009, Carlos O'Donell wrote:
> Historical note...
>
> We clobber all of memory in userspace, like this:
> ~~~
> #define __ldcw(a) \
> ({ \
> unsigned int __ret; \
> __asm__ __volatile__("ldcw 0(%1),%0" \
> : "=r" (__ret) : "r" (a) : "memory"); \
> __ret; \
> })
> ~~~
> I wonder if I should change that to match the kernel?
The above is perfectly safe. I believe the kernel provides a memory
barrier when necessary. There's a discussion somewhere in the mail
archives.
Dave
--
J. David Anglin dave.anglin@xxxxxxxxxxxxxx
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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