Re: [PATCH 2.6.12-rc4] cpuset exit NULL dereference fix

Linus wrote:
> For this, there is a nice 
> 
> 	atomic_dec_and_lock()
> 
> function that is the same as "atomic_dec_and_test()", except it grabs the 
> lock if the count decrements to zero.

If we take Robin's idea to add a spinlock per cpuset, then yes this
atomic_dec_and_lock() might be useful.  Thanks for mentioning it.

I am not convinced we need to go that way.  See my upcoming replies to
Simon and Robin, for alternative approaches that are simpler.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <[email protected]> 1.650.933.1373, 1.925.600.0401
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---

• References:
  • [PATCH 2.6.12-rc4] cpuset exit NULL dereference fix
    • From: Paul Jackson <[email protected]>
  • Re: [PATCH 2.6.12-rc4] cpuset exit NULL dereference fix
    • From: Simon Derr <[email protected]>
  • Re: [PATCH 2.6.12-rc4] cpuset exit NULL dereference fix
    • From: Robin Holt <[email protected]>
  • Re: [PATCH 2.6.12-rc4] cpuset exit NULL dereference fix
    • From: Linus Torvalds <[email protected]>

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