x86/cacheinfo: Use enums for cache descriptor types
The leaf 0x2 one-byte cache descriptor types:
CACHE_L1_INST
CACHE_L1_DATA
CACHE_L2
CACHE_L3
are just discriminators to be used within the cache_table[] mapping.
Their specific values are irrelevant.
Use enums for such types.
Make the enum packed and static assert that its values remain within a
single byte so that the cache_table[] array size do not go out of hand.
Use a __CHECKER__ guard for the static_assert(sizeof(enum) == 1) line as
sparse ignores the __packed annotation on enums.
This is similar to:
fe3944fb245a ("fs: Move enum rw_hint into a new header file")
for the core SCSI code.
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/Z9rsTirs9lLfEPD9@lx-t490
Link: https://lore.kernel.org/r/20250324133324.23458-19-darwi@linutronix.de