Daniel Walker wrote:
PICK_FUNCTION() is similar to the other PICK_OP style macros, and was created to replace them all. I used variable argument macros to handle PICK_FUNC_2ARG/PICK_FUNC_1ARG. Otherwise the marcos are similar to the original macros used for semaphores. The entire system is used to do a compile time switch between two different locking APIs. For example, real spinlocks (raw_spinlock_t) and mutexes (or sleeping spinlocks). This new macro replaces all the duplication from lock type to lock type. The result of this patch, and the next two, is a fairly nice simplification, and consolidation. Although the seqlock changes are larger than the originals I think over all the patchset is worth while. Incorporated peterz's suggestion to not require TYPE_EQUAL() to only use pointers.
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