Change in coreboot[master]: arch/x86: Skip returning default leaf value as `0`

[Subrata Banik (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak, Paul Menzel, Angel Pons, Kyösti Mälkki.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57305 )

Change subject: arch/x86: Skip returning default leaf value as `0`
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Patch Set 2:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57305/comment/96af5062_e1d1e9e0 
PS2, Line 11: leaf
> leafs?

Ack

https://review.coreboot.org/c/coreboot/+/57305/comment/96e6bbe6_dc08f740 
PS2, Line 16: e2b5fee
> Please add: […]

Ack

Patchset:

PS2:
> No VIA support? 😜

@Tim, can you please take a look into cpu_check_deterministic_cache_cpuid_supported(), aren't we already claim the support for Intel and AMD and anything else is considered unknown/invalid. For invalid CPUID we are returning from below code anyway.

https://review.coreboot.org/c/coreboot/+/57306/2/src/arch/x86/smbios.c#769

File src/arch/x86/cpu_common.c:

https://review.coreboot.org/c/coreboot/+/57305/comment/0343075c_9a511478 
PS2, Line 115: 		return DETERMINISTIC_CACHE_PARAMETERS_CPUID_IA;
> You could use the ternary operator.

Ack