linux-kernel - [RFC PATCH 4/4] x86: enable llvm-cov support

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Message-ID: <20251014232639.673260-5-sashal@kernel.org>
Date: Tue, 14 Oct 2025 19:26:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: nathan@...nel.org
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Subject: [RFC PATCH 4/4] x86: enable llvm-cov support

From: Wentao Zhang <wentaoz5@...inois.edu>

Set ARCH_HAS_* options to "y" in kconfig and include section description in
linker script.

Signed-off-by: Wentao Zhang <wentaoz5@...inois.edu>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/Kconfig              | 2 ++
 arch/x86/kernel/vmlinux.lds.S | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fa3b616af03a2..7764562df838b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -90,6 +90,8 @@ config X86
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_KCOV			if X86_64
+	select ARCH_HAS_LLVM_COV		if X86_64
+	select ARCH_HAS_LLVM_COV_PROFILE_ALL	if X86_64
 	select ARCH_HAS_KERNEL_FPU_SUPPORT
 	select ARCH_HAS_MEM_ENCRYPT
 	select ARCH_HAS_MEMBARRIER_SYNC_CORE
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index d7af4a64c211b..d2caff2a1abff 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -203,6 +203,8 @@ SECTIONS
 
 	BUG_TABLE
 
+	LLVM_COV_DATA
+
 	ORC_UNWIND_TABLE
 
 	/* Init code and data - will be freed after init */
-- 
2.51.0