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SubjectRe: Linux 2.4.5-ac9
> Looks bogus. Independent processes can open the same device
> once for reading and once for writing, now you are serializing
> needlessly these processes. Please revert.

Some of the serializing is not a bug but I agree that patch is not yet
right. Think for example about

thread1 thread2

blocks mmap

Also parallel buffer allocations


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