Re: PI mutex support on ARM

["Remy Bohmer" <l.pinguin@gmail.com>]

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...

Remy
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/