linux-kernel - Re: [PATCH v2 3/4] x86: disable llvm-cov instrumentation

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Message-ID: <20241002011739.GC555609@thelio-3990X>
Date: Tue, 1 Oct 2024 18:17:39 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Wentao Zhang <wentaoz5@...inois.edu>
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Subject: Re: [PATCH v2 3/4] x86: disable llvm-cov instrumentation

On Wed, Sep 04, 2024 at 11:32:44PM -0500, Wentao Zhang wrote:
> Disable instrumentation for arch/x86/crypto/curve25519-x86_64.c. Otherwise
> compilation would fail with "error: inline assembly requires more registers
> than available".
> 
> Similar behavior was reported with gcov as well. See c390c452ebeb ("crypto:
> x86/curve25519 - disable gcov").
> 
> Signed-off-by: Wentao Zhang <wentaoz5@...inois.edu>
> Reviewed-by: Chuck Wolber <chuck.wolber@...ing.com>
> Tested-by: Chuck Wolber <chuck.wolber@...ing.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  arch/x86/crypto/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
> index 53b4a2778..57f3d4921 100644
> --- a/arch/x86/crypto/Makefile
> +++ b/arch/x86/crypto/Makefile
> @@ -119,5 +119,6 @@ quiet_cmd_perlasm = PERLASM $@
>  $(obj)/%.S: $(src)/%.pl FORCE
>  	$(call if_changed,perlasm)
>  
> -# Disable GCOV in odd or sensitive code
> +# Disable GCOV and llvm-cov in odd or sensitive code
>  GCOV_PROFILE_curve25519-x86_64.o := n
> +LLVM_COV_PROFILE_curve25519-x86_64.o := n
> -- 
> 2.45.2
>