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

[kuznet]

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)

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