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[v2,3/4] x86: disable llvm-cov instrumentation

Message ID 20240905043245.1389509-4-wentaoz5@illinois.edu
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 
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@illinois.edu>
Reviewed-by: Chuck Wolber <chuck.wolber@boeing.com>
Tested-by: Chuck Wolber <chuck.wolber@boeing.com>
---
 arch/x86/crypto/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

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