Messages in this thread | | | Subject | Re: MMIO and gcc re-ordering issue | From | Benjamin Herrenschmidt <> | Date | Wed, 28 May 2008 07:12:46 +1000 |
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On Tue, 2008-05-27 at 09:47 -0700, Linus Torvalds wrote: > > __read[bwlq]()/__write[bwlq]() are not serialized with a :"memory" > barrier, although since they still use "asm volatile" I suspect that > i > practice they are probably serial too. Did not look very closely at > any > generated code (only did a trivial test to see that the code looks > *roughly* correct).
Nah, asm volatile doesn't help, it does need the "memory" clobber too.
Cheers, Ben.
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