Re: spin_lock forgets to clobber memory and other smp fixes [was

From: kuznet@ms2.inr.ac.ru
Date: Thu Sep 07 2000 - 11:31:08 EST


Hello!

> tried to grep gcc but my gcc knowledge is too low to reverse engeneer the
> implement semantics of the "memory" clobber fast

Just hint. I remember the time when "memory" clobber option
was _absent_ in gcc. And we managed to compile kernel with such gcc. 8)
To all that I understand, "asm" (like function calls) implied barrier
that time and constraints and clobber option were used only for
register allocation and reloading.

Alexey

BTW Look also into asm-i386/bitops.h and dummy cast to some crap there.
Are you impressed? 8)

-
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