lib/crypto: arm64/gf128hash: Remove obsolete chunking logic

Since commit aefbab8e77eb ("arm64: fpsimd: Preserve/restore kernel mode
NEON at context switch"), kernel-mode NEON sections have been
preemptible on arm64.  And since commit 7dadeaa6e851 ("sched: Further
restrict the preemption modes"), voluntary preemption is no longer
supported on arm64 either.  Therefore, there's no longer any need to
limit the length of kernel-mode NEON sections on arm64.

Simplify the GHASH and POLYVAL code accordingly.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260401000548.133151-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

diff --git a/lib/crypto/arm64/gf128hash.h b/lib/crypto/arm64/gf128hash.h
index b2c85585b75837d9381ea4f4b99214fe68897549..1d1179f87f8d15af1ea0dc08806d4f54a951dd4c 100644 (file)
--- a/lib/crypto/arm64/gf128hash.h
+++ b/lib/crypto/arm64/gf128hash.h
@@ -89,16 +89,8 @@ static void ghash_blocks_arch(struct polyval_elem *acc,
                              const u8 *data, size_t nblocks)
 {
        if (static_branch_likely(&have_asimd) && may_use_simd()) {
-               do {
-                       /* Allow rescheduling every 4 KiB. */
-                       size_t n = min_t(size_t, nblocks,
-                                        4096 / GHASH_BLOCK_SIZE);
-
-                       scoped_ksimd()
-                               pmull_ghash_update_p8(n, acc, data, &key->h);
-                       data += n * GHASH_BLOCK_SIZE;
-                       nblocks -= n;
-               } while (nblocks);
+               scoped_ksimd()
+                       pmull_ghash_update_p8(nblocks, acc, data, &key->h);
        } else {
                ghash_blocks_generic(acc, &key->h, data, nblocks);
        }
@@ -110,16 +102,8 @@ static void polyval_blocks_arch(struct polyval_elem *acc,
                                const u8 *data, size_t nblocks)
 {
        if (static_branch_likely(&have_pmull) && may_use_simd()) {
-               do {
-                       /* Allow rescheduling every 4 KiB. */
-                       size_t n = min_t(size_t, nblocks,
-                                        4096 / POLYVAL_BLOCK_SIZE);
-
-                       scoped_ksimd()
-                               polyval_blocks_pmull(acc, key, data, n);
-                       data += n * POLYVAL_BLOCK_SIZE;
-                       nblocks -= n;
-               } while (nblocks);
+               scoped_ksimd()
+                       polyval_blocks_pmull(acc, key, data, nblocks);
        } else {
                polyval_blocks_generic(acc, &key->h_powers[NUM_H_POWERS - 1],
                                       data, nblocks);