linux-kernel - [PATCH] crypto: x86/curve25519

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Date:   Tue, 22 Nov 2022 14:54:49 -0800
From:   Joe Fradley <joefradley@...gle.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     kernel-team@...roid.com, Joe Fradley <joefradley@...gle.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: x86/curve25519 - disable gcov

curve25519-x86_64.c fails to build when CONFIG_GCOV_KERNEL is enabled.
The error is "inline assembly requires more registers than available"
thrown from the `fsqr()` function. Therefore, excluding this file from
GCOV profiling until this issue is resolved. Thereby allowing
CONFIG_GCOV_PROFILE_ALL to be enabled for x86.

Signed-off-by: Joe Fradley <joefradley@...gle.com>
---
 arch/x86/crypto/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 3b1d701a4f6c..3e7a329235bd 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -107,3 +107,6 @@ quiet_cmd_perlasm = PERLASM $@
       cmd_perlasm = $(PERL) $< > $@
 $(obj)/%.S: $(src)/%.pl FORCE
 	$(call if_changed,perlasm)
+
+# Disable GCOV in odd or sensitive code
+GCOV_PROFILE_curve25519-x86_64.o := n
-- 
2.38.1.584.g0f3c55d4c2-goog