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The cacheinfo code frequently uses the output registers from CPUID leaf 0x4. Such registers are cached in 'struct _cpuid4_info_regs', augmented with related information, and are then passed across functions. The naming of these _cpuid4_info_regs instances is confusing at best. Some instances are called "this_leaf", which is vague as "this" lacks context and "leaf" is overly generic given that other CPUID leaves are also processed within cacheinfo. Other _cpuid4_info_regs instances are just called "base", adding further ambiguity. Standardize on id4 for all instances. 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/20250324133324.23458-11-darwi@linutronix.de