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, 46 insertions, 0 deletions

diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile
new file mode 100644
index 000000000..84046e730
--- /dev/null
+++ b/arch/alpha/lib/Makefile
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for alpha-specific library files..
+#
+
+asflags-y := $(KBUILD_CFLAGS)
+
+# Many of these routines have implementations tuned for ev6.
+# Choose them iff we're targeting ev6 specifically.
+ev6-$(CONFIG_ALPHA_EV6) := ev6-
+
+# Several make use of the cttz instruction introduced in ev67.
+ev67-$(CONFIG_ALPHA_EV67) := ev67-
+
+lib-y =	__divqu.o __remqu.o __divlu.o __remlu.o \
+	udiv-qrnnd.o \
+	udelay.o \
+	$(ev6-y)memset.o \
+	$(ev6-y)memcpy.o \
+	memmove.o \
+	checksum.o \
+	csum_partial_copy.o \
+	$(ev67-y)strlen.o \
+	stycpy.o \
+	styncpy.o \
+	$(ev67-y)strchr.o \
+	$(ev67-y)strrchr.o \
+	$(ev6-y)memchr.o \
+	$(ev6-y)copy_user.o \
+	$(ev6-y)clear_user.o \
+	$(ev6-y)csum_ipv6_magic.o \
+	$(ev6-y)clear_page.o \
+	$(ev6-y)copy_page.o \
+	fpreg.o \
+	callback_srm.o srm_puts.o srm_printk.o \
+	fls.o
+
+# The division routines are built from single source, with different defines.
+AFLAGS___divqu.o = -DDIV
+AFLAGS___remqu.o =       -DREM
+AFLAGS___divlu.o = -DDIV       -DINTSIZE
+AFLAGS___remlu.o =       -DREM -DINTSIZE
+
+$(addprefix $(obj)/,__divqu.o __remqu.o __divlu.o __remlu.o): \
+						$(src)/$(ev6-y)divide.S FORCE
+	$(call if_changed_rule,as_o_S)