Merge tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipgrafted

Pull futex fix from Ingo Molnar:

 - Also allocate a default private futex hash on vfork() as well, to
   avoid races with (private) futex waiters (Peter Zijlstra)

* tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Also allocate private hash on vfork()

1 files changed, 35 insertions, 0 deletions

diff --git a/lib/crypto/arm64/sha512.h b/lib/crypto/arm64/sha512.h
new file mode 100644
index 000000000..5da27e6e2
--- /dev/null
+++ b/lib/crypto/arm64/sha512.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * arm64-optimized SHA-512 block function
+ *
+ * Copyright 2025 Google LLC
+ */
+
+#include <asm/simd.h>
+#include <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha512_insns);
+
+asmlinkage void sha512_block_data_order(struct sha512_block_state *state,
+					const u8 *data, size_t nblocks);
+asmlinkage void sha512_ce_transform(struct sha512_block_state *state,
+				    const u8 *data, size_t nblocks);
+
+static void sha512_blocks(struct sha512_block_state *state,
+			  const u8 *data, size_t nblocks)
+{
+	if (static_branch_likely(&have_sha512_insns) &&
+	    likely(may_use_simd())) {
+		scoped_ksimd()
+			sha512_ce_transform(state, data, nblocks);
+	} else {
+		sha512_block_data_order(state, data, nblocks);
+	}
+}
+
+#define sha512_mod_init_arch sha512_mod_init_arch
+static void sha512_mod_init_arch(void)
+{
+	if (cpu_have_named_feature(SHA512))
+		static_branch_enable(&have_sha512_insns);
+}