Like commit aa031b8f702e ("crypto: x86/sha512 - load based on CPU
features"), add module aliases for x86-optimized crypto modules:
sm3
based on CPU feature bits so udev gets a chance to load them later in
the boot process when the filesystems are all running.
This commit covers a module that created rcu stall issues
due to kernel_fpu_begin/kernel_fpu_end calls.
Signed-off-by: Robert Elliott <elliott@xxxxxxx>
---
arch/x86/crypto/sm3_avx_glue.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/x86/crypto/sm3_avx_glue.c b/arch/x86/crypto/sm3_avx_glue.c
index ffb6d2f409ef..475b9637a06d 100644
--- a/arch/x86/crypto/sm3_avx_glue.c
+++ b/arch/x86/crypto/sm3_avx_glue.c
@@ -15,6 +15,7 @@
#include <linux/types.h>
#include <crypto/sm3.h>
#include <crypto/sm3_base.h>
+#include <asm/cpu_device_id.h>
#include <asm/simd.h>
#define FPU_BYTES 4096U /* avoid kernel_fpu_begin/end scheduler/rcu stalls */
@@ -115,10 +116,19 @@ static struct shash_alg sm3_avx_alg = {
}
};
+static const struct x86_cpu_id module_cpu_ids[] = {
+ X86_MATCH_FEATURE(X86_FEATURE_AVX, NULL),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, module_cpu_ids);
+
static int __init sm3_avx_mod_init(void)
{
const char *feature_name;
+ if (!x86_match_cpu(module_cpu_ids))
+ return -ENODEV;
+
if (!boot_cpu_has(X86_FEATURE_AVX)) {
pr_info("AVX instruction are not detected.\n");
return -ENODEV;
--
2.37.3
