[PATCH v1 3/3] crypto: x86/crc32c-intel Exclude low performance CRC32C instruction CPUs

[Tony W Wang-oc]

Low performance CRC32C instruction CPUs expect to use the driver
crc32c-generic. So remove these CPUs support from crc32c-intel.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx>
---
 arch/x86/crypto/crc32c-intel_glue.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/crypto/crc32c-intel_glue.c b/arch/x86/crypto/crc32c-intel_glue.c
index feccb52..1b6d289 100644
--- a/arch/x86/crypto/crc32c-intel_glue.c
+++ b/arch/x86/crypto/crc32c-intel_glue.c
@@ -224,6 +224,11 @@ static int __init crc32c_intel_mod_init(void)
 {
 	if (!x86_match_cpu(crc32c_cpu_id))
 		return -ENODEV;
+
+	/* Don't merit use low performance CRC32C instruction */
+	if (boot_cpu_has(X86_FEATURE_CRC32C))
+		return -ENODEV;
+
 #ifdef CONFIG_X86_64
 	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
 		alg.update = crc32c_pcl_intel_update;
-- 
2.7.4