crypto/arm64: nhpoly1305 - Switch to 'ksimd' scoped guard API

Switch to the more abstract 'scoped_ksimd()' API, which will be modified
in a future patch to transparently allocate a kernel mode FP/SIMD state
buffer on the stack, so that kernel mode FP/SIMD code remains
preemptible in principe, but without the memory overhead that adds 528
bytes to the size of struct task_struct.

Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/arch/arm64/crypto/nhpoly1305-neon-glue.c b/arch/arm64/crypto/nhpoly1305-neon-glue.c
index e4a0b463f080e0a095293ac101103f2cd59f49ac..013de6ac569a14fc5bad6a0345367e97d65d1c9e 100644 (file)
--- a/arch/arm64/crypto/nhpoly1305-neon-glue.c
+++ b/arch/arm64/crypto/nhpoly1305-neon-glue.c
@@ -25,9 +25,8 @@ static int nhpoly1305_neon_update(struct shash_desc *desc,
        do {
                unsigned int n = min_t(unsigned int, srclen, SZ_4K);
 
-               kernel_neon_begin();
-               crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
-               kernel_neon_end();
+               scoped_ksimd()
+                       crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
                src += n;
                srclen -= n;
        } while (srclen);