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

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Message-ID: <20240905043245.1389509-4-wentaoz5@illinois.edu>
Date: Wed,  4 Sep 2024 23:32:44 -0500
From: Wentao Zhang <wentaoz5@...inois.edu>
To: wentaoz5@...inois.edu
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Subject: [PATCH v2 3/4] x86: disable llvm-cov instrumentation

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>
---
 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