regarding use of various cmpxchg* API

[Pranith Kumar]

Hi Peter, Ingo,

I see that in the drivers there are the following types of cmpxchg API:

__cmpxchg64()
atomic_cmpxchg()
atomic64_cmpxchg()
cmpxchg()
atomic_long_cmpxchg()
cmpxchg_local()
local_cmpxchg()(in kernel/events/ring_buffer.c)
this_cpu_cmpxchg()

Since cmpxchg() internally handles the width, do you think it makes sense to replace the above uses of cmpxchg with the document API (cmpxchg, atomic_cmpxchg, cmpxchg_local)?

I am willing to do this and wanted to know if it something you think is worth pursuing.

Regards,
Pranith
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