[PATCH v2 01/74] x86/cpu/vfm: Add/initialize x86_vfm field to struct cpuinfo_x86

From: Tony Luck
Date: Mon Apr 01 2024 - 14:24:10 EST


Refactor struct cpuinfo_x86 so that the vendor, family, and model
fields are overlayed in a union with a 32-bit field that combines
all three (together with a one byte reserved field in the upper
byte).

This will make it easy, cheap, and reliable to check all three
values at once.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
arch/x86/include/asm/processor.h | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 811548f131f4..4c5d166aa473 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -108,9 +108,15 @@ struct cpuinfo_topology {
};

struct cpuinfo_x86 {
- __u8 x86; /* CPU family */
- __u8 x86_vendor; /* CPU vendor */
- __u8 x86_model;
+ union {
+ struct {
+ __u8 x86_model;
+ __u8 x86; /* CPU family */
+ __u8 x86_vendor; /* CPU vendor */
+ __u8 x86_reserved;
+ };
+ __u32 x86_vfm; /* combined vendor, family, model */
+ };
__u8 x86_stepping;
#ifdef CONFIG_X86_64
/* Number of 4K pages in DTLB/ITLB combined(in pages): */
--
2.44.0