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SubjectRe: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
On Tue, 20 Dec 2005, Arjan van de Ven wrote:

> on x86 the fastpath is the same for both basically.. is there a
> fundamental reason it can't be for ARM?

ARM prior ARM architecture level 6 (which means about 99% of all ARM
processors in the field currently) cannot do an atomic
decrement/increment. It must be done manually with interrupt disabled.

The only truly atomic instruction it has is a swap which lays itself
pretty well for mutex support.

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