Messages in this thread | | | Date | Tue, 27 May 2008 10:31:14 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: MMIO and gcc re-ordering issue |
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On Tue, 27 May 2008, Linus Torvalds wrote: > > Here's a UNTESTED patch for x86 that may or may not compile and work, and > which serializes (on a compiler level) the IO accesses against regular > memory accesses.
Ok, so it at least boots on x86-32. Thus probably on x86-64 too (since the code is now shared). I didn't look at whether it generates much bigger code due to the potential extra serialization, but some of the code generation I looked at looked fine.
IOW, it doesn't at least create any _obviously_ worse code, and it should be arguably safer than assuming the compiler does volatile accesses the way we want it to.
Linus
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