Re: start_kernel(): bug: interrupts were enabled early

[Jamie Lokier]

David Howells wrote:
> Russell King <rmk@xxxxxxxxxxxxxxxx> wrote:
> > We use the standard generic kernel implementation.  Is x86 different? ;)
> 
> The optimised fast paths used on x86 rwsems don't disable interrupts.

Any reason not to use the same technique for all the archs - plus the
trick used in arch/armkernel/entry-armv.S:__kuser_cmpxchg for those
archs which don't have atomic instructions or ll/sc?

If the problem here is _only_ semaphores, and the above might make
semaphores faster anyway, perhaps it's a solution.

-- Jamie
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