crypto: arm/crc32 - enable module autoloading based on CPU feature bits

Make the module autoloadable by tying it to the CPU feature bits that describe whether the optional instructions it relies on are implemented by the current CPU. Signed-off-by: Ard Biesheuvel <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
opendata26 · Jun 1, 2017 · 2a9faf8 · 2a9faf8
1 parent a83ff88
commit 2a9faf8
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/arm/crypto/crc32-ce-glue.c b/arch/arm/crypto/crc32-ce-glue.c
@@ -8,6 +8,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/cpufeature.h>
 #include <linux/crc32.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -233,6 +234,11 @@ static void __exit crc32_pmull_mod_exit(void)
 				  ARRAY_SIZE(crc32_pmull_algs));
 }
 
+static const struct cpu_feature crc32_cpu_feature[] = {
+	{ cpu_feature(CRC32) }, { cpu_feature(PMULL) }, { }
+};
+MODULE_DEVICE_TABLE(cpu, crc32_cpu_feature);
+
 module_init(crc32_pmull_mod_init);
 module_exit(crc32_pmull_mod_exit);