Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

1 files changed, 184 insertions, 0 deletions

diff --git a/lib/crypto/tests/Kconfig b/lib/crypto/tests/Kconfig
new file mode 100644
index 000000000..9409c1a93
--- /dev/null
+++ b/lib/crypto/tests/Kconfig
@@ -0,0 +1,184 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+config CRYPTO_LIB_AES_CBC_MACS_KUNIT_TEST
+	tristate "KUnit tests for AES-CMAC, AES-XCBC-MAC, and AES-CBC-MAC" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_AES_CBC_MACS
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the AES-CMAC, AES-XCBC-MAC, and AES-CBC-MAC message
+	  authentication codes.
+
+config CRYPTO_LIB_BLAKE2B_KUNIT_TEST
+	tristate "KUnit tests for BLAKE2b" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_BLAKE2B
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the BLAKE2b cryptographic hash function.
+
+config CRYPTO_LIB_BLAKE2S_KUNIT_TEST
+	tristate "KUnit tests for BLAKE2s" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	# No need to depend on CRYPTO_LIB_BLAKE2S here, as that option doesn't
+	# exist; the BLAKE2s code is always built-in for the /dev/random driver.
+	help
+	  KUnit tests for the BLAKE2s cryptographic hash function.
+
+config CRYPTO_LIB_CHACHA20POLY1305_KUNIT_TEST
+	tristate "KUnit tests for ChaCha20Poly1305" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_CHACHA20POLY1305
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the ChaCha20Poly1305 authenticated encryption
+	  algorithm.
+
+config CRYPTO_LIB_CURVE25519_KUNIT_TEST
+	tristate "KUnit tests for Curve25519" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_CURVE25519
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the Curve25519 Diffie-Hellman function.
+
+config CRYPTO_LIB_GHASH_KUNIT_TEST
+	tristate "KUnit tests for GHASH" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_GF128HASH
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the GHASH library functions.
+
+config CRYPTO_LIB_MD5_KUNIT_TEST
+	tristate "KUnit tests for MD5" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_MD5
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the MD5 cryptographic hash function and its
+	  corresponding HMAC.
+
+config CRYPTO_LIB_MLDSA_KUNIT_TEST
+	tristate "KUnit tests for ML-DSA" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_MLDSA
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the ML-DSA digital signature algorithm.
+
+config CRYPTO_LIB_NH_KUNIT_TEST
+	tristate "KUnit tests for NH" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_NH
+	default KUNIT_ALL_TESTS
+	help
+	  KUnit tests for the NH almost-universal hash function.
+
+config CRYPTO_LIB_POLY1305_KUNIT_TEST
+	tristate "KUnit tests for Poly1305" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_POLY1305
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the Poly1305 library functions.
+
+config CRYPTO_LIB_POLYVAL_KUNIT_TEST
+	tristate "KUnit tests for POLYVAL" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_GF128HASH
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the POLYVAL library functions.
+
+config CRYPTO_LIB_SHA1_KUNIT_TEST
+	tristate "KUnit tests for SHA-1" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_SHA1
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the SHA-1 cryptographic hash function and its
+	  corresponding HMAC.
+
+# Option is named *_SHA256_KUNIT_TEST, though both SHA-224 and SHA-256 tests are
+# included, for consistency with the naming used elsewhere (e.g. CRYPTO_SHA256).
+config CRYPTO_LIB_SHA256_KUNIT_TEST
+	tristate "KUnit tests for SHA-224 and SHA-256" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_SHA256
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the SHA-224 and SHA-256 cryptographic hash functions
+	  and their corresponding HMACs.
+
+# Option is named *_SHA512_KUNIT_TEST, though both SHA-384 and SHA-512 tests are
+# included, for consistency with the naming used elsewhere (e.g. CRYPTO_SHA512).
+config CRYPTO_LIB_SHA512_KUNIT_TEST
+	tristate "KUnit tests for SHA-384 and SHA-512" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_SHA512
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the SHA-384 and SHA-512 cryptographic hash functions
+	  and their corresponding HMACs.
+
+config CRYPTO_LIB_SHA3_KUNIT_TEST
+	tristate "KUnit tests for SHA-3" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_SHA3
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the SHA3 cryptographic hash and XOF functions,
+	  including SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128 and
+	  SHAKE256.
+
+config CRYPTO_LIB_SM3_KUNIT_TEST
+	tristate "KUnit tests for SM3" if !KUNIT_ALL_TESTS
+	depends on KUNIT && CRYPTO_LIB_SM3
+	default KUNIT_ALL_TESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  KUnit tests for the SM3 cryptographic hash function.
+
+config CRYPTO_LIB_ENABLE_ALL_FOR_KUNIT
+	tristate "Enable all crypto library code for KUnit tests"
+	depends on KUNIT
+	select CRYPTO_LIB_AES_CBC_MACS
+	select CRYPTO_LIB_BLAKE2B
+	select CRYPTO_LIB_CHACHA20POLY1305
+	select CRYPTO_LIB_CURVE25519
+	select CRYPTO_LIB_GF128HASH
+	select CRYPTO_LIB_MD5
+	select CRYPTO_LIB_MLDSA
+	select CRYPTO_LIB_NH
+	select CRYPTO_LIB_POLY1305
+	select CRYPTO_LIB_SHA1
+	select CRYPTO_LIB_SHA256
+	select CRYPTO_LIB_SHA512
+	select CRYPTO_LIB_SHA3
+	select CRYPTO_LIB_SM3
+	help
+	  Enable all the crypto library code that has KUnit tests.
+
+	  Enable this only if you'd like to test all the crypto library code,
+	  even code that wouldn't otherwise need to be built.
+
+	  You'll still need to enable the tests themselves, either individually
+	  or using KUNIT_ALL_TESTS.
+
+config CRYPTO_LIB_BENCHMARK_VISIBLE
+	bool
+
+config CRYPTO_LIB_BENCHMARK
+	bool "Include benchmarks in KUnit tests for cryptographic functions"
+	depends on CRYPTO_LIB_BENCHMARK_VISIBLE
+	help
+	  Include benchmarks in the KUnit tests for cryptographic functions.
+	  The benchmark results are printed to the kernel log when the
+	  corresponding KUnit test suite runs.
+
+	  This is useful for evaluating the performance of the cryptographic
+	  functions.  However, it will increase the runtime of the KUnit tests.
+
+	  If you're only interested in correctness testing, leave this disabled.