linux-kernel - [PATCH v2 01/74] x86/cpu/vfm: Add/initialize x86_vfm field to struct cpuinfo

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Message-ID: <Zgr7vfS4ArMh4kWx@agluck-desk3>
Date: Mon, 1 Apr 2024 11:23:57 -0700
From: Tony Luck <tony.luck@...el.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH v2 01/74] x86/cpu/vfm: Add/initialize x86_vfm field to struct
 cpuinfo_x86

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@...el.com>
---
 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