This patchset adds a lockless memory allocator and a lock-less
list.

v5:

- Add ARCH_HAVE_NMI_SAFE_CMPXCHG
- Add spin_trylock_irqsave based fallback in lockless memory allocator
  if ARCH_HAVE_NMI_SAFE_CMPXCHG=n
- Make lockless list depends on ARCH_HAVE_NMI_SAFE_CMPXCHG

v4:

- Split from APEI patchset
- Update patch description and comments according to ML comments

v3:

- Rework lockless memory allocator and list according to ML comments

[PATCH -v5 1/3] Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG
[PATCH -v5 2/3] lib, Make gen_pool memory allocator lockless
[PATCH -v5 3/3] lib, Add lock-less NULL terminated single list
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