Messages in this thread | | | From | Linus Torvalds <> | Date | Mon, 27 Sep 2010 10:10:40 -0700 | Subject | Re: alpha: potential race around hae_cache in RESTORE_ALL |
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On Mon, Sep 27, 2010 at 9:26 AM, Ivan Kokshaysky <ink@jurassic.park.msu.ru> wrote: > > Looks like we need to drop HAE bits from SAVE_ALL/RESTORE_ALL, which > benefits (1) and automatically fixes (3), and do the entire IO sequences > in (2) with disabled interrupts (if HAE is involved).
No can do.
HAE is used in user space too (the X server), and it depends on the kernel restoring HAE over interrupts and system calls, afaik.
I'm also pretty certain that all SMP machines either don't have HAE at all, or have a per-CPU HAE in hardware (and then it's possible that we screw it up in software, of course). Anything else would be too broken for words. Can somebody find documentation saying otherwise?
Linus
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