Thomas Gleixner wrote:
quoted text
> On Sat, 4 Oct 2008, Jesse Brandeburg wrote:
>>> Exactly. The access to a ro region results in a fault. I have nowhere
>>> seen that trigger, but I can reproduce the trylock() WARN_ON, which
>>> confirms that there is concurrent access to the NVRAM registers. The
>>> backtrace pattern is similar to the one you have seen.
>> are you still getting WARN_ON *with* all the mutex based fixes already applied?
> 
> The WARN_ON triggers with current mainline. Is there any fixlet in
> Linus tree missing ?
> 
>> with the mutex patches in place (without protection patch) we are
>> still reproducing the issue, until we apply the set_memory_ro patch.
> 
> That does not make sense to me. If the memory_ro patch is providing
> _real_ protection then you _must_ run into an access violation. If not,
> then the patch just papers over the real problem in some mysterious
> way.
> 

not if the bad code is doing copy_to_user .... (or similar)
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