[PATCH v3 02/11] types: Introduce [us]128

Peter Zijlstra
2023-05-15T08:07:40Z

Introduce [us]128 (when available). Unlike [us]64, ensure they are
always naturally aligned.

This also enables 128bit wide atomics (which require natural
alignment) such as cmpxchg128().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
---
include/linux/types.h | 5 +++++
include/uapi/linux/types.h | 4 ++++
2 files changed, 9 insertions(+)

--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -10,6 +10,11 @@
#define DECLARE_BITMAP(name,bits) \
unsigned long name[BITS_TO_LONGS(bits)]

+#ifdef __SIZEOF_INT128__
+typedef __s128 s128;
+typedef __u128 u128;
+#endif
+
typedef u32 __kernel_dev_t;

typedef __kernel_fd_set fd_set;
--- a/include/uapi/linux/types.h
+++ b/include/uapi/linux/types.h
@@ -13,6 +13,10 @@

#include <linux/posix_types.h>

+#ifdef __SIZEOF_INT128__
+typedef __signed__ __int128 __s128 __attribute__((aligned(16)));
+typedef unsigned __int128 __u128 __attribute__((aligned(16)));
+#endif

/*
* Below are truly Linux-specific types that should never collide with
--- a/lib/crypto/curve25519-hacl64.c
+++ b/lib/crypto/curve25519-hacl64.c
@@ -14,8 +14,6 @@
#include <crypto/curve25519.h>
#include <linux/string.h>

-typedef __uint128_t u128;
-
static __always_inline u64 u64_eq_mask(u64 a, u64 b)
{
u64 x = a ^ b;
--- a/lib/crypto/poly1305-donna64.c
+++ b/lib/crypto/poly1305-donna64.c
@@ -10,8 +10,6 @@
#include <asm/unaligned.h>
#include <crypto/internal/poly1305.h>

-typedef __uint128_t u128;
-
void poly1305_core_setkey(struct poly1305_core_key *key,
const u8 raw_key[POLY1305_BLOCK_SIZE])
{