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[v2,4/4] x86: enable llvm-cov support

Message ID 20240905043245.1389509-5-wentaoz5@illinois.edu (mailing list archive)
State New
Headers show
Series Enable measuring the kernel's Source-based Code Coverage and MC/DC with Clang | expand

Commit Message

Wentao Zhang Sept. 5, 2024, 4:32 a.m. UTC 
Set ARCH_HAS_* options to "y" in kconfig and include section description in
linker script.

Signed-off-by: Wentao Zhang <wentaoz5@illinois.edu>
Reviewed-by: Chuck Wolber <chuck.wolber@boeing.com>
Tested-by: Chuck Wolber <chuck.wolber@boeing.com>
---
 arch/x86/Kconfig              | 2 ++
 arch/x86/kernel/vmlinux.lds.S | 2 ++
 2 files changed, 4 insertions(+)

Comments

Nathan Chancellor Oct. 2, 2024, 1:18 a.m. UTC | #1 
On Wed, Sep 04, 2024 at 11:32:45PM -0500, Wentao Zhang wrote:
> Set ARCH_HAS_* options to "y" in kconfig and include section description in

Is description the right word here? Maybe "include the compiler generated
sections"? Open to other suggestions.

> linker script.
> 
> Signed-off-by: Wentao Zhang <wentaoz5@illinois.edu>
> Reviewed-by: Chuck Wolber <chuck.wolber@boeing.com>
> Tested-by: Chuck Wolber <chuck.wolber@boeing.com>

Reviewed-by: Nathan Chancellor <nathan@kernel.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 007bab9f2..e0a8f7b42 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -85,6 +85,8 @@ 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 6e73403e8..904337722 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -191,6 +191,8 @@ SECTIONS
>  
>  	BUG_TABLE
>  
> +	LLVM_COV_DATA
> +
>  	ORC_UNWIND_TABLE
>  
>  	. = ALIGN(PAGE_SIZE);
> -- 
> 2.45.2
>
diff mbox series

Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 007bab9f2..e0a8f7b42 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -85,6 +85,8 @@  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 6e73403e8..904337722 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -191,6 +191,8 @@  SECTIONS
 
 	BUG_TABLE
 
+	LLVM_COV_DATA
+
 	ORC_UNWIND_TABLE
 
 	. = ALIGN(PAGE_SIZE);