Re: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lockif possible

[Ingo Molnar]

* Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> > Could you please try the patch below?
> 
> This is very likely not a good idea.  I heard some systems can hang
> if you overwrite their PMUs this way and you're unlucky enough :-(

Wrong - in that case all kernels from 2.6.32 to 2.6.38 would already be locking 
up. This patch simply restores behavior to essentially what it was before 
v2.6.38 - but also adds the warning.

Thanks,

	Ingo
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