Re: recursive spinlocks. Shoot.

Alan Cox (alan@lxorguk.ukuu.org.uk)
19 May 2003 18:57:58 +0100

On Llu, 2003-05-19 at 18:27, Peter T. Breuer wrote:
> :-). Well, whaddya know. Both read and write of a int (declared
> volatile) are atomic on ia32.

Except when they aren't. There are ppro SMP issues about ordering of
unlocked stores in some situations. Thats why the PPro generates
lock movb $0, foo for the unlock on PPro

Fixable however by PPro specific lock ops

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