linux-kernel - [PATCH 02/10] x86/cpu: Use MWAIT leaf definition

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Message-Id: <20241213205029.5B055D6E@davehans-spike.ostc.intel.com>
Date: Fri, 13 Dec 2024 12:50:29 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org,tglx@...utronix.de,bp@...en8.de,rafael@...nel.org,lenb@...nel.org,dave.jiang@...el.com,irenic.rajneesh@...il.com,david.e.box@...el.com,Dave Hansen <dave.hansen@...ux.intel.com>,zhao1.liu@...el.com
Subject: [PATCH 02/10] x86/cpu: Use MWAIT leaf definition


From: Dave Hansen <dave.hansen@...ux.intel.com>

The leaf-to-feature dependency array uses hard-coded leaf numbers.
Use the new common header definition for the MWAIT leaf.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@...el.com>
---

 b/arch/x86/kernel/cpu/common.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN arch/x86/kernel/cpu/common.c~mwait-leaf-checks-1 arch/x86/kernel/cpu/common.c
--- a/arch/x86/kernel/cpu/common.c~mwait-leaf-checks-1	2024-12-13 12:45:33.207069895 -0800
+++ b/arch/x86/kernel/cpu/common.c	2024-12-13 12:45:33.211070065 -0800
@@ -29,6 +29,7 @@
 
 #include <asm/alternative.h>
 #include <asm/cmdline.h>
+#include <asm/cpuid.h>
 #include <asm/perf_event.h>
 #include <asm/mmu_context.h>
 #include <asm/doublefault.h>
@@ -636,7 +637,7 @@ struct cpuid_dependent_feature {
 
 static const struct cpuid_dependent_feature
 cpuid_dependent_features[] = {
-	{ X86_FEATURE_MWAIT,		0x00000005 },
+	{ X86_FEATURE_MWAIT,		CPUID_MWAIT_LEAF },
 	{ X86_FEATURE_DCA,		0x00000009 },
 	{ X86_FEATURE_XSAVE,		0x0000000d },
 	{ 0, 0 }
_