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

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Since commit aefbab8e77 ("arm64: fpsimd: Preserve/restore kernel mode
NEON at context switch"), kernel-mode NEON sections have been
preemptible on arm64.  And since commit 7dadeaa6e8 ("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>
This commit is contained in:
Eric Biggers
2026-03-31 17:05:42 -07:00
parent 63fcc765e1
commit d3a5cc5c92
1 changed files with 4 additions and 20 deletions
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24
lib/crypto/arm64/gf128hash.h
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@@ -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);