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Message-ID: <20240328163746.243023-2-tony.luck@intel.com>
Date: Thu, 28 Mar 2024 09:37:44 -0700
From: Tony Luck <tony.luck@...el.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
Tony Luck <tony.luck@...el.com>
Subject: [PATCH 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..87115e5d884f 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_vendor; /* CPU vendor */
+ __u8 x86; /* CPU family */
+ __u8 x86_model;
+ __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
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