[PATCH v1 3/3] crypto: x86/crc32c-intel Exclude low performance CRC32C instruction CPUs
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From: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
Date: 2021-01-07 06:20:53
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Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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;
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2.7.4