diff mbox series

[1/6] crypto: arm64/crct10dif - Remove obsolete chunking logic

Message ID 20241028190207.1394367-9-ardb+git@google.com (mailing list archive)
State New
Headers show
Series Clean up and improve ARM/arm64 CRC-T10DIF code | expand

Commit Message

Ard Biesheuvel Oct. 28, 2024, 7:02 p.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

This is a partial revert of commit fc754c024a343b, which moved the logic
into C code which ensures that kernel mode NEON code does not hog the
CPU for too long.

This is no longer needed now that kernel mode NEON no longer disables
preemption, so we can drop this.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/crypto/crct10dif-ce-glue.c | 30 ++++----------------
 1 file changed, 6 insertions(+), 24 deletions(-)

Comments

Eric Biggers Oct. 30, 2024, 3:54 a.m. UTC | #1 
On Mon, Oct 28, 2024 at 08:02:09PM +0100, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@kernel.org>
> 
> This is a partial revert of commit fc754c024a343b, which moved the logic
> into C code which ensures that kernel mode NEON code does not hog the
> CPU for too long.
> 
> This is no longer needed now that kernel mode NEON no longer disables
> preemption, so we can drop this.
> 
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  arch/arm64/crypto/crct10dif-ce-glue.c | 30 ++++----------------
>  1 file changed, 6 insertions(+), 24 deletions(-)

Reviewed-by: Eric Biggers <ebiggers@google.com>

- Eric
diff mbox series

Patch

diff --git a/arch/arm64/crypto/crct10dif-ce-glue.c b/arch/arm64/crypto/crct10dif-ce-glue.c
index 606d25c559ed..7b05094a0480 100644
--- a/arch/arm64/crypto/crct10dif-ce-glue.c
+++ b/arch/arm64/crypto/crct10dif-ce-glue.c
@@ -37,18 +37,9 @@  static int crct10dif_update_pmull_p8(struct shash_desc *desc, const u8 *data,
 	u16 *crc = shash_desc_ctx(desc);
 
 	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
-		do {
-			unsigned int chunk = length;
-
-			if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE)
-				chunk = SZ_4K;
-
-			kernel_neon_begin();
-			*crc = crc_t10dif_pmull_p8(*crc, data, chunk);
-			kernel_neon_end();
-			data += chunk;
-			length -= chunk;
-		} while (length);
+		kernel_neon_begin();
+		*crc = crc_t10dif_pmull_p8(*crc, data, length);
+		kernel_neon_end();
 	} else {
 		*crc = crc_t10dif_generic(*crc, data, length);
 	}
@@ -62,18 +53,9 @@  static int crct10dif_update_pmull_p64(struct shash_desc *desc, const u8 *data,
 	u16 *crc = shash_desc_ctx(desc);
 
 	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
-		do {
-			unsigned int chunk = length;
-
-			if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE)
-				chunk = SZ_4K;
-
-			kernel_neon_begin();
-			*crc = crc_t10dif_pmull_p64(*crc, data, chunk);
-			kernel_neon_end();
-			data += chunk;
-			length -= chunk;
-		} while (length);
+		kernel_neon_begin();
+		*crc = crc_t10dif_pmull_p64(*crc, data, length);
+		kernel_neon_end();
 	} else {
 		*crc = crc_t10dif_generic(*crc, data, length);
 	}