[PATCH 1/5] lib/crc: arm64: Drop unnecessary chunking logic from crc64

Ard Biesheuvel
2026-03-30T14:46:43Z

On arm64, kernel mode NEON executes with preemption enabled, so there is
no need to chunk the input by hand.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
lib/crc/arm64/crc64.h | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/lib/crc/arm64/crc64.h b/lib/crc/arm64/crc64.h
index cc65abeee24c..ab052a782c07 100644
--- a/lib/crc/arm64/crc64.h
+++ b/lib/crc/arm64/crc64.h
@@ -16,15 +16,13 @@ static inline u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
{
if (len >= 128 && cpu_have_named_feature(PMULL) &&
likely(may_use_simd())) {
- do {
- size_t chunk = min_t(size_t, len & ~15, SZ_4K);
+ size_t chunk = len & ~15;

- scoped_ksimd()
- crc = crc64_nvme_arm64_c(crc, p, chunk);
+ scoped_ksimd()
+ crc = crc64_nvme_arm64_c(crc, p, chunk);

- p += chunk;
- len -= chunk;
- } while (len >= 128);
+ p += chunk;
+ len &= 15;
}
return crc64_nvme_generic(crc, p, len);
}
--
2.53.0.1018.g2bb0e51243-goog