linux-kernel - [PATCH] crypto - move crypto_simd_disabled_for

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Message-ID: <20241018235343.425758-1-ebiggers@kernel.org>
Date: Fri, 18 Oct 2024 16:53:43 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: linux-crypto@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] crypto - move crypto_simd_disabled_for_test to lib

From: Eric Biggers <ebiggers@...gle.com>

Move crypto_simd_disabled_for_test to lib/ so that crypto_simd_usable()
can be used by library code.

This was discussed previously
(https://lore.kernel.org/linux-crypto/20220716062920.210381-4-ebiggers@kernel.org/)
but was not done because there was no use case yet.  However, this is
now needed for the arm64 CRC32 library code.

Tested with:
    export ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
    echo CONFIG_CRC32=y > .config
    echo CONFIG_MODULES=y >> .config
    echo CONFIG_CRYPTO=m >> .config
    echo CONFIG_DEBUG_KERNEL=y >> .config
    echo CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=n >> .config
    echo CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y >> .config
    make olddefconfig
    make -j$(nproc)

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 crypto/algapi.c     |  6 ------
 lib/crypto/Makefile |  2 ++
 lib/crypto/simd.c   | 11 +++++++++++
 3 files changed, 13 insertions(+), 6 deletions(-)
 create mode 100644 lib/crypto/simd.c

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 74e2261c184ca..429a832f90fe0 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -4,11 +4,10 @@
  *
  * Copyright (c) 2006 Herbert Xu <herbert@...dor.apana.org.au>
  */
 
 #include <crypto/algapi.h>
-#include <crypto/internal/simd.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/fips.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -21,15 +20,10 @@
 
 #include "internal.h"
 
 static LIST_HEAD(crypto_template_list);
 
-#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
-DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
-EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
-#endif
-
 static inline void crypto_check_module_sig(struct module *mod)
 {
 	if (fips_enabled && mod && !module_sig_ok(mod))
 		panic("Module %s signature verification failed in FIPS mode\n",
 		      module_name(mod));
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index 969baab8c805f..01fac1cd05a19 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -56,5 +56,7 @@ libblake2s-y					+= blake2s-selftest.o
 libchacha20poly1305-y				+= chacha20poly1305-selftest.o
 libcurve25519-y					+= curve25519-selftest.o
 endif
 
 obj-$(CONFIG_MPILIB) += mpi/
+
+obj-$(CONFIG_CRYPTO_MANAGER_EXTRA_TESTS)	+= simd.o
diff --git a/lib/crypto/simd.c b/lib/crypto/simd.c
new file mode 100644
index 0000000000000..9c36cb3bb49c4
--- /dev/null
+++ b/lib/crypto/simd.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SIMD testing utility functions
+ *
+ * Copyright 2024 Google LLC
+ */
+
+#include <crypto/internal/simd.h>
+
+DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
+EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);

base-commit: 5c20772738e1d1d7bec41664eb9d61497e53c10e
-- 
2.47.0