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

Tony W Wang-oc
2021-01-07T06:20:53Z

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@zhaoxin.com>
---
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