linux-kernel - [tip: x86/cleanups] x86/cpufeatures: Correct LKGS feature flag description

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Message-ID: <176229472775.2601451.15031143628480729557.tip-bot2@tip-bot2>
Date: Tue, 04 Nov 2025 22:18:47 -0000
From: "tip-bot2 for Borislav Petkov (AMD)" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Xin Li (Intel)" <xin@...or.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/cleanups] x86/cpufeatures: Correct LKGS feature flag description

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     47955b58cf9b97fe4dc2b0d622b8ea3a2656bbf9
Gitweb:        https://git.kernel.org/tip/47955b58cf9b97fe4dc2b0d622b8ea3a2656bbf9
Author:        Borislav Petkov (AMD) <bp@...en8.de>
AuthorDate:    Wed, 15 Oct 2025 12:35:48 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 04 Nov 2025 23:09:34 +01:00

x86/cpufeatures: Correct LKGS feature flag description

Quotation marks in cpufeatures.h comments are special and when the
comment begins with a quoted string, that string lands in /proc/cpuinfo,
turning it into a user-visible one.

The LKGS comment doesn't begin with a quoted string but just in case
drop the quoted "kernel" in there to avoid confusion. And while at it,
simply change the description into what the LKGS instruction does for
more clarity.

No functional changes.

Reviewed-by: Xin Li (Intel) <xin@...or.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20251015103548.10194-1-bp@kernel.org
---
 arch/x86/include/asm/cpufeatures.h       | 2 +-
 tools/arch/x86/include/asm/cpufeatures.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 4091a77..245cf6b 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -320,7 +320,7 @@
 #define X86_FEATURE_FSRS		(12*32+11) /* Fast short REP STOSB */
 #define X86_FEATURE_FSRC		(12*32+12) /* Fast short REP {CMPSB,SCASB} */
 #define X86_FEATURE_FRED		(12*32+17) /* "fred" Flexible Return and Event Delivery */
-#define X86_FEATURE_LKGS		(12*32+18) /* Load "kernel" (userspace) GS */
+#define X86_FEATURE_LKGS		(12*32+18) /* Like MOV_GS except MSR_KERNEL_GS_BASE = GS.base */
 #define X86_FEATURE_WRMSRNS		(12*32+19) /* Non-serializing WRMSR */
 #define X86_FEATURE_AMX_FP16		(12*32+21) /* AMX fp16 Support */
 #define X86_FEATURE_AVX_IFMA            (12*32+23) /* Support for VPMADD52[H,L]UQ */
diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h
index 06fc047..f61802f 100644
--- a/tools/arch/x86/include/asm/cpufeatures.h
+++ b/tools/arch/x86/include/asm/cpufeatures.h
@@ -320,7 +320,7 @@
 #define X86_FEATURE_FSRS		(12*32+11) /* Fast short REP STOSB */
 #define X86_FEATURE_FSRC		(12*32+12) /* Fast short REP {CMPSB,SCASB} */
 #define X86_FEATURE_FRED		(12*32+17) /* "fred" Flexible Return and Event Delivery */
-#define X86_FEATURE_LKGS		(12*32+18) /* Load "kernel" (userspace) GS */
+#define X86_FEATURE_LKGS		(12*32+18) /* Like MOV_GS except MSR_KERNEL_GS_BASE = GS.base */
 #define X86_FEATURE_WRMSRNS		(12*32+19) /* Non-serializing WRMSR */
 #define X86_FEATURE_AMX_FP16		(12*32+21) /* AMX fp16 Support */
 #define X86_FEATURE_AVX_IFMA            (12*32+23) /* Support for VPMADD52[H,L]UQ */