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lib/crypto: arm64/chacha: 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 ChaCha code accordingly.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260401000548.133151-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2026-03-31 17:05:41 -07:00
parent 11d6bc70ff
commit 63fcc765e1
1 changed files with 4 additions and 12 deletions
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16
lib/crypto/arm64/chacha.h
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@@ -36,9 +36,9 @@ asmlinkage void hchacha_block_neon(const struct chacha_state *state,
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
static void chacha_doneon(struct chacha_state *state, u8 *dst, const u8 *src,
int bytes, int nrounds)
unsigned int bytes, int nrounds)
{
while (bytes > 0) {
while (bytes) {
int l = min(bytes, CHACHA_BLOCK_SIZE * 5);
if (l <= CHACHA_BLOCK_SIZE) {
@@ -76,16 +76,8 @@ static void chacha_crypt_arch(struct chacha_state *state, u8 *dst,
!crypto_simd_usable())
return chacha_crypt_generic(state, dst, src, bytes, nrounds);
do {
unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
scoped_ksimd()
chacha_doneon(state, dst, src, todo, nrounds);
bytes -= todo;
src += todo;
dst += todo;
} while (bytes);
scoped_ksimd()
chacha_doneon(state, dst, src, bytes, nrounds);
}
#define chacha_mod_init_arch chacha_mod_init_arch