crypto: arch - conditionalize crypto api in arch glue for lib code

For glue code that's used by Zinc, the actual Crypto API functions might
not necessarily exist, and don't need to exist either. Before this
patch, there are valid build configurations that lead to a unbuildable
kernel. This fixes it to conditionalize those symbols on the existence
of the proper config entry.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 14 insertions, 9 deletions

diff --git a/arch/x86/crypto/blake2s-glue.c b/arch/x86/crypto/blake2s-glue.c
index 4a37ba7cdbe5..1d9ff8a45e1f 100644
--- a/arch/x86/crypto/blake2s-glue.c
+++ b/arch/x86/crypto/blake2s-glue.c
@@ -210,12 +210,14 @@ static int __init blake2s_mod_init(void)
 			      XFEATURE_MASK_AVX512, NULL))
 		static_branch_enable(&blake2s_use_avx512);
 
-	return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
+	return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
+		crypto_register_shashes(blake2s_algs,
+					ARRAY_SIZE(blake2s_algs)) : 0;
 }
 
 static void __exit blake2s_mod_exit(void)
 {
-	if (boot_cpu_has(X86_FEATURE_SSSE3))
+	if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
 		crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
 }
 
diff --git a/arch/x86/crypto/chacha_glue.c b/arch/x86/crypto/chacha_glue.c
index a94e30b6f941..68a74953efaf 100644
--- a/arch/x86/crypto/chacha_glue.c
+++ b/arch/x86/crypto/chacha_glue.c
@@ -299,12 +299,13 @@ static int __init chacha_simd_mod_init(void)
 		    boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */
 			static_branch_enable(&chacha_use_avx512vl);
 	}
-	return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
+	return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ?
+		crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0;
 }
 
 static void __exit chacha_simd_mod_fini(void)
 {
-	if (boot_cpu_has(X86_FEATURE_SSSE3))
+	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) && boot_cpu_has(X86_FEATURE_SSSE3))
 		crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
 }
 
diff --git a/arch/x86/crypto/curve25519-x86_64.c b/arch/x86/crypto/curve25519-x86_64.c
index a52a3fb15727..eec7d2d24239 100644
--- a/arch/x86/crypto/curve25519-x86_64.c
+++ b/arch/x86/crypto/curve25519-x86_64.c
@@ -2457,13 +2457,14 @@ static int __init curve25519_mod_init(void)
 		static_branch_enable(&curve25519_use_adx);
 	else
 		return 0;
-	return crypto_register_kpp(&curve25519_alg);
+	return IS_REACHABLE(CONFIG_CRYPTO_KPP) ?
+		crypto_register_kpp(&curve25519_alg) : 0;
 }
 
 static void __exit curve25519_mod_exit(void)
 {
-	if (boot_cpu_has(X86_FEATURE_BMI2) ||
-	    boot_cpu_has(X86_FEATURE_ADX))
+	if (IS_REACHABLE(CONFIG_CRYPTO_KPP) &&
+	    (boot_cpu_has(X86_FEATURE_BMI2) || boot_cpu_has(X86_FEATURE_ADX)))
 		crypto_unregister_kpp(&curve25519_alg);
 }
 
diff --git a/arch/x86/crypto/poly1305_glue.c b/arch/x86/crypto/poly1305_glue.c
index 370cd88068ec..0cc4537e6617 100644
--- a/arch/x86/crypto/poly1305_glue.c
+++ b/arch/x86/crypto/poly1305_glue.c
@@ -224,12 +224,13 @@ static int __init poly1305_simd_mod_init(void)
 	    cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL))
 		static_branch_enable(&poly1305_use_avx2);
 
-	return crypto_register_shash(&alg);
+	return IS_REACHABLE(CONFIG_CRYPTO_HASH) ? crypto_register_shash(&alg) : 0;
 }
 
 static void __exit poly1305_simd_mod_exit(void)
 {
-	crypto_unregister_shash(&alg);
+	if (IS_REACHABLE(CONFIG_CRYPTO_HASH))
+		crypto_unregister_shash(&alg);
 }
 
 module_init(poly1305_simd_mod_init);