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[4/5] crypto: arm/sha2-ce - enable module autoloading based on CPU feature bits

Message ID 1495362220-30044-5-git-send-email-ard.biesheuvel@linaro.org
State Accepted
Commit a83ff88bedb2794f5990439276bf0abbc4b3aeb8
Headers show
Series crypto: arm - enable module autoloading | expand

Commit Message

Ard Biesheuvel May 21, 2017, 10:23 a.m. UTC 
Make the module autoloadable by tying it to the CPU feature bit that
describes whether the optional instructions it relies on are implemented
by the current CPU.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/arm/crypto/sha2-ce-glue.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

-- 
2.7.4
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Patch

diff --git a/arch/arm/crypto/sha2-ce-glue.c b/arch/arm/crypto/sha2-ce-glue.c
index 0755b2d657f3..df4dcef054ae 100644
--- a/arch/arm/crypto/sha2-ce-glue.c
+++ b/arch/arm/crypto/sha2-ce-glue.c
@@ -11,6 +11,7 @@ 
 #include <crypto/internal/hash.h>
 #include <crypto/sha.h>
 #include <crypto/sha256_base.h>
+#include <linux/cpufeature.h>
 #include <linux/crypto.h>
 #include <linux/module.h>
 
@@ -100,8 +101,6 @@  static struct shash_alg algs[] = { {
 
 static int __init sha2_ce_mod_init(void)
 {
-	if (!(elf_hwcap2 & HWCAP2_SHA2))
-		return -ENODEV;
 	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 }
 
@@ -110,5 +109,5 @@  static void __exit sha2_ce_mod_fini(void)
 	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 }
 
-module_init(sha2_ce_mod_init);
+module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 module_exit(sha2_ce_mod_fini);