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, 114 insertions, 0 deletions

diff --git a/drivers/input/mouse/sentelic.h b/drivers/input/mouse/sentelic.h
new file mode 100644
index 000000000..02cac0e7a
--- /dev/null
+++ b/drivers/input/mouse/sentelic.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*-
+ * Finger Sensing Pad PS/2 mouse driver.
+ *
+ * Copyright (C) 2005-2007 Asia Vital Components Co., Ltd.
+ * Copyright (C) 2005-2012 Tai-hwa Liang, Sentelic Corporation.
+ */
+
+#ifndef	__SENTELIC_H
+#define	__SENTELIC_H
+
+/* Finger-sensing Pad information registers */
+#define	FSP_REG_DEVICE_ID	0x00
+#define	FSP_REG_VERSION		0x01
+#define	FSP_REG_REVISION	0x04
+#define	FSP_REG_TMOD_STATUS1	0x0B
+#define	FSP_BIT_NO_ROTATION	BIT(3)
+#define	FSP_REG_PAGE_CTRL	0x0F
+
+/* Finger-sensing Pad control registers */
+#define	FSP_REG_SYSCTL1		0x10
+#define	FSP_BIT_EN_REG_CLK	BIT(5)
+#define	FSP_REG_TMOD_STATUS	0x20
+#define	FSP_REG_OPC_QDOWN	0x31
+#define	FSP_BIT_EN_OPC_TAG	BIT(7)
+#define	FSP_REG_OPTZ_XLO	0x34
+#define	FSP_REG_OPTZ_XHI	0x35
+#define	FSP_REG_OPTZ_YLO	0x36
+#define	FSP_REG_OPTZ_YHI	0x37
+#define	FSP_REG_SYSCTL5		0x40
+#define	FSP_BIT_90_DEGREE	BIT(0)
+#define	FSP_BIT_EN_MSID6	BIT(1)
+#define	FSP_BIT_EN_MSID7	BIT(2)
+#define	FSP_BIT_EN_MSID8	BIT(3)
+#define	FSP_BIT_EN_AUTO_MSID8	BIT(5)
+#define	FSP_BIT_EN_PKT_G0	BIT(6)
+
+#define	FSP_REG_ONPAD_CTL	0x43
+#define	FSP_BIT_ONPAD_ENABLE	BIT(0)
+#define	FSP_BIT_ONPAD_FBBB	BIT(1)
+#define	FSP_BIT_FIX_VSCR	BIT(3)
+#define	FSP_BIT_FIX_HSCR	BIT(5)
+#define	FSP_BIT_DRAG_LOCK	BIT(6)
+
+#define	FSP_REG_SWC1		(0x90)
+#define	FSP_BIT_SWC1_EN_ABS_1F	BIT(0)
+#define	FSP_BIT_SWC1_EN_GID	BIT(1)
+#define	FSP_BIT_SWC1_EN_ABS_2F	BIT(2)
+#define	FSP_BIT_SWC1_EN_FUP_OUT	BIT(3)
+#define	FSP_BIT_SWC1_EN_ABS_CON	BIT(4)
+#define	FSP_BIT_SWC1_GST_GRP0	BIT(5)
+#define	FSP_BIT_SWC1_GST_GRP1	BIT(6)
+#define	FSP_BIT_SWC1_BX_COMPAT	BIT(7)
+
+#define	FSP_PAGE_0B		(0x0b)
+#define	FSP_PAGE_82		(0x82)
+#define	FSP_PAGE_DEFAULT	FSP_PAGE_82
+
+#define	FSP_REG_SN0		(0x40)
+#define	FSP_REG_SN1		(0x41)
+#define	FSP_REG_SN2		(0x42)
+
+/* Finger-sensing Pad packet formating related definitions */
+
+/* absolute packet type */
+#define	FSP_PKT_TYPE_NORMAL	(0x00)
+#define	FSP_PKT_TYPE_ABS	(0x01)
+#define	FSP_PKT_TYPE_NOTIFY	(0x02)
+#define	FSP_PKT_TYPE_NORMAL_OPC	(0x03)
+#define	FSP_PKT_TYPE_SHIFT	(6)
+
+/* bit definitions for the first byte of report packet */
+#define	FSP_PB0_LBTN		BIT(0)
+#define	FSP_PB0_RBTN		BIT(1)
+#define	FSP_PB0_MBTN		BIT(2)
+#define	FSP_PB0_MFMC_FGR2	FSP_PB0_MBTN
+#define	FSP_PB0_MUST_SET	BIT(3)
+#define	FSP_PB0_PHY_BTN		BIT(4)
+#define	FSP_PB0_MFMC		BIT(5)
+
+/* hardware revisions */
+#define	FSP_VER_STL3888_A4	(0xC1)
+#define	FSP_VER_STL3888_B0	(0xD0)
+#define	FSP_VER_STL3888_B1	(0xD1)
+#define	FSP_VER_STL3888_B2	(0xD2)
+#define	FSP_VER_STL3888_C0	(0xE0)
+#define	FSP_VER_STL3888_C1	(0xE1)
+#define	FSP_VER_STL3888_D0	(0xE2)
+#define	FSP_VER_STL3888_D1	(0xE3)
+#define	FSP_VER_STL3888_E0	(0xE4)
+
+#ifdef __KERNEL__
+
+struct fsp_data {
+	unsigned char	ver;		/* hardware version */
+	unsigned char	rev;		/* hardware revison */
+	unsigned int	buttons;	/* Number of buttons */
+	unsigned int	flags;
+#define	FSPDRV_FLAG_EN_OPC	(0x001)	/* enable on-pad clicking */
+
+	bool		vscroll;	/* Vertical scroll zone enabled */
+	bool		hscroll;	/* Horizontal scroll zone enabled */
+
+	unsigned char	last_reg;	/* Last register we requested read from */
+	unsigned char	last_val;
+	unsigned int	last_mt_fgr;	/* Last seen finger(multitouch) */
+};
+
+extern int fsp_detect(struct psmouse *psmouse, bool set_properties);
+extern int fsp_init(struct psmouse *psmouse);
+
+#endif	/* __KERNEL__ */
+
+#endif	/* !__SENTELIC_H */