Messages in this thread | | | Date | Sun, 8 Jul 2007 22:17:40 +0200 | From | "Remy Bohmer" <> | Subject | Re: PI mutex support on ARM |
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Hello Ingo,
> patch format problem: never diff the asm/ files, diff the asm-arm/ files. Yeah, of course, I know, I believe I made a real mess of this one ...
> is it safe to do a get_user() with irqs off? rhetorical question ;-)) I was wondering, Is it safe to use a normal spinlock here, like this?
------- 8-< ------------- spin_lock(&futex_lock);
err = get_user(uval, uaddr); if ((!err) && (uval == oldval)) err = put_user(newval, uaddr);
spin_unlock(&futex_lock); ------- 8-< -------------
> is this method of atomic ops SMP-safe? another rhetorical question ;-)) Nope, I already knew that, that why I mentioned that it probably only worked on UP...
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