Merge series "Extend regulator notification support" from Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>:

Extend regulator notification support

This series extends the regulator notification and error flag support.
Initial discussion on the topic can be found here:
https://lore.kernel.org/lkml/6046836e22b8252983f08d5621c35ececb97820d.camel@fi.rohmeurope.com/

In a nutshell - the series adds:

1. WARNING level events/error flags. (Patch 3)
  Current regulator 'ERROR' event notifications for over/under
  voltage, over current and over temperature are used to indicate
  condition where monitored entity is so badly "off" that it actually
  indicates a hardware error which can not be recovered. The most
  typical hanling for that is believed to be a (graceful)
  system-shutdown. Here we add set of 'WARNING' level flags to allow
  sending notifications to consumers before things are 'that badly off'
  so that consumer drivers can implement recovery-actions.
2. Device-tree properties for specifying limit values. (Patches 1, 5)
  Add limits for above mentioned 'ERROR' and 'WARNING' levels (which
  send notifications to consumers) and also for a 'PROTECTION' level
  (which will be used to immediately shut-down the regulator(s) W/O
  informing consumer drivers. Typically implemented by hardware).
  Property parsing is implemented in regulator core which then calls
  callback operations for limit setting from the IC drivers. A
  warning is emitted if protection is requested by device tree but the
  underlying IC does not support configuring requested protection.
3. Helpers which can be registered by IC. (Patch 4)
  Target is to avoid implementing IRQ handling and IRQ storm protection
  in each IC driver. (Many of the ICs implementin these IRQs do not allow
  masking or acking the IRQ but keep the IRQ asserted for the whole
  duration of problem keeping the processor in IRQ handling loop).
4. Emergency poweroff function (refactored out of the thermal_core to
  kernel/reboot.c) which is called if IC fires error IRQs but IC reading
  fails and given retry-count is exceeded. (Patches 2, 4)
  Please note that the mutex in the emergency shutdown was replaced by a
  simple atomic in order to allow call from any context.

The helper was attempted to be done so it could be used to implement
roughly same logic as is used in qcom-labibb regulator. This means
amongst other things a safety shut-down if IC registers are not readable.
Using these shut-down retry counters are optional. The idea is that the
helper could be also used by simpler ICs which do not provide status
register(s) which can be used to check if error is still active.

ICs which do not have such status register can simply omit the 'renable'
callback (and retry-counts etc) - and helper assumes the situation is Ok
and re-enables IRQ after given time period. If problem persists the
handler is ran again and another notification is sent - but at least the
delay allows processor to avoid IRQ loop.

Patch 7 takes this notification support in use at BD9576MUF.
Patch 8 is related to MFD change which is not really related to the RFC
here. It was added to this series in order to avoid potential conflicts.
Patch 9 adds a maintainers entry.

Changelog v10-RESEND:
   - rebased on v5.13-rc4
Changelog v10:
   - rebased on v5.13-rc2
   - Move rdev_*() print macros to the internal.h and use rdev_dbg()
     from irq_helpers.c
   - Export rdev_get_name() and move it from coupler.h to driver.h for
     others to use. (It was already in coupler.h but not exported -
     usage was limited and coupler.h does not sound like optimal place
     as rdev_name is not only used by coupled regulators)
   - Send all regulator notifications from irq_helpers.c at one OR'd
     event for the sake of simplicity. For BD9576 this does not matter
     as it has own IRQ for each event case. Header defining events says
     they may be OR'd.
   - Change WARN() at protection shutdown to pr_emerg as suggested by
     Petr.
Changelog v9:
   - rebases on v5.13-rc1
   - Update thermal documentation
   - Fix regulator notification event number
Changelog v8:
   - split shutdown API adding and thermal core taking it in use to
     own patches.
   - replace the spinlock with atomic when ensuring the emergency
     shutdown is only called once.
Changelog v7:
  general:
   - rebased on v5.12-rc7
   - new patch for refactoring the hw-failure reboot logic out of
     thermal_core.c for others to use.
  notification helpers:
   - fix regulator error_flags query
   - grammar/typos
   - do not BUG() but attempt to shut-down the system
   - use BITS_PER_TYPE()

Changelog v6:
  Add MAINTAINERS entry
  Changes to IRQ notifiers
   - move devm functions to drivers/regulator/devres.c
   - drop irq validity check
   - use devm_add_action_or_reset()
   - fix styling issues
   - fix kerneldocs

Changelog v5:
   - Fix the badly formatted pr_emerg() call.

Changelog v4:
   - rebased on v5.12-rc6
   - dropped RFC
   - fix external FET DT-binding.
   - improve prints for cases when expecting HW failure.
   - styling and typos

Changelog v3:
  Regulator core:
   - Fix dangling pointer access at regulator_irq_helper()
  stpmic1_regulator:
   - fix function prototype (compile error)
  bd9576-regulator:
   - Update over current limits to what was given in new data-sheet
     (REV00K)
   - Allow over-current monitoring without external FET. Set limits to
     values given in data-sheet (REV00K).

Changelog v2:
  Generic:
  - rebase on v5.12-rc2 + BD9576 series
  - Split devm variant of delayed wq to own series
  Regulator framework:
  - Provide non devm variant of IRQ notification helpers
  - shorten dt-property names as suggested by Rob
  - unconditionally call map_event in IRQ handling and require it to be
    populated
  BD9576 regulators:
  - change the FET resistance property to micro-ohms
  - fix voltage computation in OC limit setting

34 files changed, 356 insertions, 74 deletions

diff --git a/include/linux/bits.h b/include/linux/bits.h
index 7f475d59a097..87d112650dfb 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -22,7 +22,7 @@
 #include <linux/build_bug.h>
 #define GENMASK_INPUT_CHECK(h, l) \
 	(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
-		__builtin_constant_p((l) > (h)), (l) > (h), 0)))
+		__is_constexpr((l) > (h)), (l) > (h), 0)))
 #else
 /*
  * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1255823b2bc0..f69c75bd6d27 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -676,11 +676,6 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
 extern void blk_set_pm_only(struct request_queue *q);
 extern void blk_clear_pm_only(struct request_queue *q);
 
-static inline bool blk_account_rq(struct request *rq)
-{
-	return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
-}
-
 #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
 
 #define rq_data_dir(rq)		(op_is_write(req_op(rq)) ? WRITE : READ)
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 559ee05f86b2..fb8f6d2cd104 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -232,7 +232,7 @@ struct css_set {
 	struct list_head task_iters;
 
 	/*
-	 * On the default hierarhcy, ->subsys[ssid] may point to a css
+	 * On the default hierarchy, ->subsys[ssid] may point to a css
 	 * attached to an ancestor instead of the cgroup this css_set is
 	 * associated with.  The following node is anchored at
 	 * ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
@@ -668,7 +668,7 @@ struct cgroup_subsys {
 	 */
 	bool threaded:1;
 
-	/* the following two fields are initialized automtically during boot */
+	/* the following two fields are initialized automatically during boot */
 	int id;
 	const char *name;
 
@@ -757,7 +757,7 @@ static inline void cgroup_threadgroup_change_end(struct task_struct *tsk) {}
  * sock_cgroup_data overloads (prioidx, classid) and the cgroup pointer.
  * On boot, sock_cgroup_data records the cgroup that the sock was created
  * in so that cgroup2 matches can be made; however, once either net_prio or
- * net_cls starts being used, the area is overriden to carry prioidx and/or
+ * net_cls starts being used, the area is overridden to carry prioidx and/or
  * classid.  The two modes are distinguished by whether the lowest bit is
  * set.  Clear bit indicates cgroup pointer while set bit prioidx and
  * classid.
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 4f2f79de083e..6bc9c76680b2 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -32,7 +32,7 @@ struct kernel_clone_args;
 #ifdef CONFIG_CGROUPS
 
 /*
- * All weight knobs on the default hierarhcy should use the following min,
+ * All weight knobs on the default hierarchy should use the following min,
  * default and max values.  The default value is the logarithmic center of
  * MIN and MAX and allows 100x to be expressed in both directions.
  */
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 98dd7b324c35..8855b1b702b2 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -213,12 +213,11 @@ typedef struct compat_siginfo {
 		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
 		struct {
 			compat_uptr_t _addr;	/* faulting insn/memory ref. */
-#ifdef __ARCH_SI_TRAPNO
-			int _trapno;	/* TRAP # which caused the signal */
-#endif
 #define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
 				     sizeof(short) : __alignof__(compat_uptr_t))
 			union {
+				/* used on alpha and sparc */
+				int _trapno;	/* TRAP # which caused the signal */
 				/*
 				 * used when si_code=BUS_MCEERR_AR or
 				 * used when si_code=BUS_MCEERR_AO
@@ -236,7 +235,10 @@ typedef struct compat_siginfo {
 					u32 _pkey;
 				} _addr_pkey;
 				/* used when si_code=TRAP_PERF */
-				compat_ulong_t _perf;
+				struct {
+					compat_ulong_t _data;
+					u32 _type;
+				} _perf;
 			};
 		} _sigfault;
 
diff --git a/include/linux/console_struct.h b/include/linux/console_struct.h
index 153734816b49..d5b9c8d40c18 100644
--- a/include/linux/console_struct.h
+++ b/include/linux/console_struct.h
@@ -101,6 +101,7 @@ struct vc_data {
 	unsigned int	vc_rows;
 	unsigned int	vc_size_row;		/* Bytes per row */
 	unsigned int	vc_scan_lines;		/* # of scan lines */
+	unsigned int	vc_cell_height;		/* CRTC character cell height */
 	unsigned long	vc_origin;		/* [!] Start of real screen */
 	unsigned long	vc_scr_end;		/* [!] End of real screen */
 	unsigned long	vc_visible_origin;	/* [!] Top of visible window */
diff --git a/include/linux/const.h b/include/linux/const.h
index 81b8aae5a855..435ddd72d2c4 100644
--- a/include/linux/const.h
+++ b/include/linux/const.h
@@ -3,4 +3,12 @@
 
 #include <vdso/const.h>
 
+/*
+ * This returns a constant expression while determining if an argument is
+ * a constant expression, most importantly without evaluating the argument.
+ * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
+ */
+#define __is_constexpr(x) \
+	(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
+
 #endif /* _LINUX_CONST_H */
diff --git a/include/linux/device.h b/include/linux/device.h
index 38a2071cf776..f1a00040fa53 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -570,7 +570,7 @@ struct device {
  * @flags: Link flags.
  * @rpm_active: Whether or not the consumer device is runtime-PM-active.
  * @kref: Count repeated addition of the same link.
- * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
+ * @rm_work: Work structure used for removing the link.
  * @supplier_preactivated: Supplier has been made active before consumer probe.
  */
 struct device_link {
@@ -583,9 +583,7 @@ struct device_link {
 	u32 flags;
 	refcount_t rpm_active;
 	struct kref kref;
-#ifdef CONFIG_SRCU
-	struct rcu_head rcu_head;
-#endif
+	struct work_struct rm_work;
 	bool supplier_preactivated; /* Owned by consumer probe. */
 };
 
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index a57ee75342cf..dce631e678dd 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -32,6 +32,11 @@ struct _ddebug {
 #define _DPRINTK_FLAGS_INCL_FUNCNAME	(1<<2)
 #define _DPRINTK_FLAGS_INCL_LINENO	(1<<3)
 #define _DPRINTK_FLAGS_INCL_TID		(1<<4)
+
+#define _DPRINTK_FLAGS_INCL_ANY		\
+	(_DPRINTK_FLAGS_INCL_MODNAME | _DPRINTK_FLAGS_INCL_FUNCNAME |\
+	 _DPRINTK_FLAGS_INCL_LINENO  | _DPRINTK_FLAGS_INCL_TID)
+
 #if defined DEBUG
 #define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
 #else
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 1fe8e105b83b..dcb2f9022c1d 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -34,7 +34,7 @@ struct elevator_mq_ops {
 	void (*depth_updated)(struct blk_mq_hw_ctx *);
 
 	bool (*allow_merge)(struct request_queue *, struct request *, struct bio *);
-	bool (*bio_merge)(struct blk_mq_hw_ctx *, struct bio *, unsigned int);
+	bool (*bio_merge)(struct request_queue *, struct bio *, unsigned int);
 	int (*request_merge)(struct request_queue *q, struct request **, struct bio *);
 	void (*request_merged)(struct request_queue *, struct request *, enum elv_merge);
 	void (*requests_merged)(struct request_queue *, struct request *, struct request *);
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index ed4e67a7ff1c..59828516ebaf 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -187,5 +187,6 @@ extern u32 fw_devlink_get_flags(void);
 extern bool fw_devlink_is_strict(void);
 int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
 void fwnode_links_purge(struct fwnode_handle *fwnode);
+void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
 
 #endif
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 7e9660ea967d..6fc26f7bdf71 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -306,8 +306,6 @@ static inline void bd_unlink_disk_holder(struct block_device *bdev,
 }
 #endif /* CONFIG_SYSFS */
 
-extern struct rw_semaphore bdev_lookup_sem;
-
 dev_t blk_lookup_devt(const char *name, int partno);
 void blk_request_module(dev_t devt);
 #ifdef CONFIG_BLOCK
diff --git a/include/linux/init.h b/include/linux/init.h
index 045ad1650ed1..d82b4b2e1d25 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -242,7 +242,8 @@ extern bool initcall_debug;
 	asm(".section	\"" __sec "\", \"a\"		\n"	\
 	    __stringify(__name) ":			\n"	\
 	    ".long	" __stringify(__stub) " - .	\n"	\
-	    ".previous					\n");
+	    ".previous					\n");	\
+	static_assert(__same_type(initcall_t, &fn));
 #else
 #define ____define_initcall(fn, __unused, __name, __sec)	\
 	static initcall_t __name __used 			\
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2f34487e21f2..76102efbf079 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -10,6 +10,7 @@
 #include <linux/spinlock.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
+#include <linux/sched/stat.h>
 #include <linux/bug.h>
 #include <linux/minmax.h>
 #include <linux/mm.h>
@@ -146,7 +147,7 @@ static inline bool is_error_page(struct page *page)
  */
 #define KVM_REQ_TLB_FLUSH         (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 #define KVM_REQ_MMU_RELOAD        (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
-#define KVM_REQ_PENDING_TIMER     2
+#define KVM_REQ_UNBLOCK           2
 #define KVM_REQ_UNHALT            3
 #define KVM_REQUEST_ARCH_BASE     8
 
@@ -265,6 +266,11 @@ static inline bool kvm_vcpu_mapped(struct kvm_host_map *map)
 	return !!map->hva;
 }
 
+static inline bool kvm_vcpu_can_poll(ktime_t cur, ktime_t stop)
+{
+	return single_task_running() && !need_resched() && ktime_before(cur, stop);
+}
+
 /*
  * Sometimes a large or cross-page mmio needs to be broken up into separate
  * exits for userspace servicing.
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 01f251b6e36c..89b69e645ac7 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -141,7 +141,6 @@ static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
 
 struct nvdimm_bus;
 struct module;
-struct device;
 struct nd_blk_region;
 struct nd_blk_region_desc {
 	int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index c0f57b0c64d9..5433c08fcc68 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_MINMAX_H
 #define _LINUX_MINMAX_H
 
+#include <linux/const.h>
+
 /*
  * min()/max()/clamp() macros must accomplish three things:
  *
@@ -17,14 +19,6 @@
 #define __typecheck(x, y) \
 	(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
 
-/*
- * This returns a constant expression while determining if an argument is
- * a constant expression, most importantly without evaluating the argument.
- * Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
- */
-#define __is_constexpr(x) \
-	(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
-
 #define __no_side_effects(x, y) \
 		(__is_constexpr(x) && __is_constexpr(y))
 
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index f8e8d7e90616..020a8f7fdbdd 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -703,6 +703,27 @@ struct mlx5_hv_vhca;
 #define MLX5_LOG_SW_ICM_BLOCK_SIZE(dev) (MLX5_CAP_DEV_MEM(dev, log_sw_icm_alloc_granularity))
 #define MLX5_SW_ICM_BLOCK_SIZE(dev) (1 << MLX5_LOG_SW_ICM_BLOCK_SIZE(dev))
 
+enum {
+	MLX5_PROF_MASK_QP_SIZE		= (u64)1 << 0,
+	MLX5_PROF_MASK_MR_CACHE		= (u64)1 << 1,
+};
+
+enum {
+	MR_CACHE_LAST_STD_ENTRY = 20,
+	MLX5_IMR_MTT_CACHE_ENTRY,
+	MLX5_IMR_KSM_CACHE_ENTRY,
+	MAX_MR_CACHE_ENTRIES
+};
+
+struct mlx5_profile {
+	u64	mask;
+	u8	log_max_qp;
+	struct {
+		int	size;
+		int	limit;
+	} mr_cache[MAX_MR_CACHE_ENTRIES];
+};
+
 struct mlx5_core_dev {
 	struct device *device;
 	enum mlx5_coredev_type coredev_type;
@@ -731,7 +752,7 @@ struct mlx5_core_dev {
 	struct mutex		intf_state_mutex;
 	unsigned long		intf_state;
 	struct mlx5_priv	priv;
-	struct mlx5_profile	*profile;
+	struct mlx5_profile	profile;
 	u32			issi;
 	struct mlx5e_resources  mlx5e_res;
 	struct mlx5_dm          *dm;
@@ -1083,18 +1104,6 @@ static inline u8 mlx5_mkey_variant(u32 mkey)
 	return mkey & 0xff;
 }
 
-enum {
-	MLX5_PROF_MASK_QP_SIZE		= (u64)1 << 0,
-	MLX5_PROF_MASK_MR_CACHE		= (u64)1 << 1,
-};
-
-enum {
-	MR_CACHE_LAST_STD_ENTRY = 20,
-	MLX5_IMR_MTT_CACHE_ENTRY,
-	MLX5_IMR_KSM_CACHE_ENTRY,
-	MAX_MR_CACHE_ENTRIES
-};
-
 /* Async-atomic event notifier used by mlx5 core to forward FW
  * evetns recived from event queue to mlx5 consumers.
  * Optimise event queue dipatching.
@@ -1148,15 +1157,6 @@ int mlx5_rdma_rn_get_params(struct mlx5_core_dev *mdev,
 			    struct ib_device *device,
 			    struct rdma_netdev_alloc_params *params);
 
-struct mlx5_profile {
-	u64	mask;
-	u8	log_max_qp;
-	struct {
-		int	size;
-		int	limit;
-	} mr_cache[MAX_MR_CACHE_ENTRIES];
-};
-
 enum {
 	MLX5_PCI_DEV_IS_VF		= 1 << 0,
 };
diff --git a/include/linux/mlx5/mpfs.h b/include/linux/mlx5/mpfs.h
new file mode 100644
index 000000000000..bf700c8d5516
--- /dev/null
+++ b/include/linux/mlx5/mpfs.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+ * Copyright (c) 2021 Mellanox Technologies Ltd.
+ */
+
+#ifndef _MLX5_MPFS_
+#define _MLX5_MPFS_
+
+struct mlx5_core_dev;
+
+#ifdef CONFIG_MLX5_MPFS
+int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac);
+int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac);
+#else /* #ifndef CONFIG_MLX5_MPFS */
+static inline int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
+static inline int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
+#endif
+
+#endif
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 322ec61d0da7..c274f75efcf9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3216,5 +3216,37 @@ void mem_dump_obj(void *object);
 static inline void mem_dump_obj(void *object) {}
 #endif
 
+/**
+ * seal_check_future_write - Check for F_SEAL_FUTURE_WRITE flag and handle it
+ * @seals: the seals to check
+ * @vma: the vma to operate on
+ *
+ * Check whether F_SEAL_FUTURE_WRITE is set; if so, do proper check/handling on
+ * the vma flags.  Return 0 if check pass, or <0 for errors.
+ */
+static inline int seal_check_future_write(int seals, struct vm_area_struct *vma)
+{
+	if (seals & F_SEAL_FUTURE_WRITE) {
+		/*
+		 * New PROT_WRITE and MAP_SHARED mmaps are not allowed when
+		 * "future write" seal active.
+		 */
+		if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE))
+			return -EPERM;
+
+		/*
+		 * Since an F_SEAL_FUTURE_WRITE sealed memfd can be mapped as
+		 * MAP_SHARED and read-only, take care to not allow mprotect to
+		 * revert protections on such mappings. Do this only for shared
+		 * mappings. For private mappings, don't need to mask
+		 * VM_MAYWRITE as we still want them to be COW-writable.
+		 */
+		if (vma->vm_flags & VM_SHARED)
+			vma->vm_flags &= ~(VM_MAYWRITE);
+	}
+
+	return 0;
+}
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6613b26a8894..5aacc1c10a45 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -97,10 +97,10 @@ struct page {
 		};
 		struct {	/* page_pool used by netstack */
 			/**
-			 * @dma_addr: might require a 64-bit value even on
+			 * @dma_addr: might require a 64-bit value on
 			 * 32-bit architectures.
 			 */
-			dma_addr_t dma_addr;
+			unsigned long dma_addr[2];
 		};
 		struct {	/* slab, slob and slub */
 			union {
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a4bd41128bf3..e89df447fae3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -997,9 +997,9 @@ static inline loff_t readahead_pos(struct readahead_control *rac)
  * readahead_length - The number of bytes in this readahead request.
  * @rac: The readahead request.
  */
-static inline loff_t readahead_length(struct readahead_control *rac)
+static inline size_t readahead_length(struct readahead_control *rac)
 {
-	return (loff_t)rac->_nr_pages * PAGE_SIZE;
+	return rac->_nr_pages * PAGE_SIZE;
 }
 
 /**
@@ -1024,7 +1024,7 @@ static inline unsigned int readahead_count(struct readahead_control *rac)
  * readahead_batch_length - The number of bytes in the current batch.
  * @rac: The readahead request.
  */
-static inline loff_t readahead_batch_length(struct readahead_control *rac)
+static inline size_t readahead_batch_length(struct readahead_control *rac)
 {
 	return rac->_batch_count * PAGE_SIZE;
 }
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 60d2b26026a2..852743f07e3e 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -496,6 +496,11 @@ struct macsec_ops;
  * @mac_managed_pm: Set true if MAC driver takes of suspending/resuming PHY
  * @state: State of the PHY for management purposes
  * @dev_flags: Device-specific flags used by the PHY driver.
+ *		Bits [15:0] are free to use by the PHY driver to communicate
+ *			    driver specific behavior.
+ *		Bits [23:16] are currently reserved for future use.
+ *		Bits [31:24] are reserved for defining generic
+ *			     PHY driver behavior.
  * @irq: IRQ number of the PHY's interrupt (-1 if none)
  * @phy_timer: The timer for handling the state machine
  * @phylink: Pointer to phylink instance for this PHY
diff --git a/include/linux/pm.h b/include/linux/pm.h
index c9657408fee1..1d8209c09686 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -601,6 +601,7 @@ struct dev_pm_info {
 	unsigned int		idle_notification:1;
 	unsigned int		request_pending:1;
 	unsigned int		deferred_resume:1;
+	unsigned int		needs_force_resume:1;
 	unsigned int		runtime_auto:1;
 	bool			ignore_children:1;
 	unsigned int		no_callbacks:1;
diff --git a/include/linux/randomize_kstack.h b/include/linux/randomize_kstack.h
index fd80fab663a9..bebc911161b6 100644
--- a/include/linux/randomize_kstack.h
+++ b/include/linux/randomize_kstack.h
@@ -38,7 +38,7 @@ void *__builtin_alloca(size_t size);
 		u32 offset = raw_cpu_read(kstack_offset);		\
 		u8 *ptr = __builtin_alloca(KSTACK_OFFSET_MAX(offset));	\
 		/* Keep allocation even after "ptr" loses scope. */	\
-		asm volatile("" : "=o"(*ptr) :: "memory");		\
+		asm volatile("" :: "r"(ptr) : "memory");		\
 	}								\
 } while (0)
 
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 3734cd8f38a8..af907a3d68d1 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -79,6 +79,7 @@ extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN];
 
 extern void orderly_poweroff(bool force);
 extern void orderly_reboot(void);
+void hw_protection_shutdown(const char *reason, int ms_until_forced);
 
 /*
  * Emergency restart, callable from an interrupt handler.
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 20e84a84fb77..f72ca73631be 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -119,6 +119,16 @@ struct regulator_dev;
 #define REGULATOR_EVENT_PRE_DISABLE		0x400
 #define REGULATOR_EVENT_ABORT_DISABLE		0x800
 #define REGULATOR_EVENT_ENABLE			0x1000
+/*
+ * Following notifications should be emitted only if detected condition
+ * is such that the HW is likely to still be working but consumers should
+ * take a recovery action to prevent problems esacalating into errors.
+ */
+#define REGULATOR_EVENT_UNDER_VOLTAGE_WARN	0x2000
+#define REGULATOR_EVENT_OVER_CURRENT_WARN	0x4000
+#define REGULATOR_EVENT_OVER_VOLTAGE_WARN	0x8000
+#define REGULATOR_EVENT_OVER_TEMP_WARN		0x10000
+#define REGULATOR_EVENT_WARN_MASK		0x1E000
 
 /*
  * Regulator errors that can be queried using regulator_get_error_flags
@@ -138,6 +148,10 @@ struct regulator_dev;
 #define REGULATOR_ERROR_FAIL			BIT(4)
 #define REGULATOR_ERROR_OVER_TEMP		BIT(5)
 
+#define REGULATOR_ERROR_UNDER_VOLTAGE_WARN	BIT(6)
+#define REGULATOR_ERROR_OVER_CURRENT_WARN	BIT(7)
+#define REGULATOR_ERROR_OVER_VOLTAGE_WARN	BIT(8)
+#define REGULATOR_ERROR_OVER_TEMP_WARN		BIT(9)
 
 /**
  * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event
diff --git a/include/linux/regulator/coupler.h b/include/linux/regulator/coupler.h
index 5f86824bd117..73291f280a23 100644
--- a/include/linux/regulator/coupler.h
+++ b/include/linux/regulator/coupler.h
@@ -52,7 +52,6 @@ struct regulator_coupler {
 
 #ifdef CONFIG_REGULATOR
 int regulator_coupler_register(struct regulator_coupler *coupler);
-const char *rdev_get_name(struct regulator_dev *rdev);
 int regulator_check_consumers(struct regulator_dev *rdev,
 			      int *min_uV, int *max_uV,
 			      suspend_state_t state);
@@ -69,10 +68,6 @@ static inline int regulator_coupler_register(struct regulator_coupler *coupler)
 {
 	return 0;
 }
-static inline const char *rdev_get_name(struct regulator_dev *rdev)
-{
-	return NULL;
-}
 static inline int regulator_check_consumers(struct regulator_dev *rdev,
 					    int *min_uV, int *max_uV,
 					    suspend_state_t state)
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 35e5a611db81..4aec20387857 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -40,6 +40,15 @@ enum regulator_status {
 	REGULATOR_STATUS_UNDEFINED,
 };
 
+enum regulator_detection_severity {
+	/* Hardware shut down voltage outputs if condition is detected */
+	REGULATOR_SEVERITY_PROT,
+	/* Hardware is probably damaged/inoperable */
+	REGULATOR_SEVERITY_ERR,
+	/* Hardware is still recoverable but recovery action must be taken */
+	REGULATOR_SEVERITY_WARN,
+};
+
 /* Initialize struct linear_range for regulators */
 #define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV)	\
 {									\
@@ -78,8 +87,25 @@ enum regulator_status {
  * @get_current_limit: Get the configured limit for a current-limited regulator.
  * @set_input_current_limit: Configure an input limit.
  *
- * @set_over_current_protection: Support capability of automatically shutting
- *                               down when detecting an over current event.
+ * @set_over_current_protection: Support enabling of and setting limits for over
+ *	current situation detection. Detection can be configured for three
+ *	levels of severity.
+ *	REGULATOR_SEVERITY_PROT should automatically shut down the regulator(s).
+ *	REGULATOR_SEVERITY_ERR should indicate that over-current situation is
+ *		caused by an unrecoverable error but HW does not perform
+ *		automatic shut down.
+ *	REGULATOR_SEVERITY_WARN should indicate situation where hardware is
+ *		still believed to not be damaged but that a board sepcific
+ *		recovery action is needed. If lim_uA is 0 the limit should not
+ *		be changed but the detection should just be enabled/disabled as
+ *		is requested.
+ * @set_over_voltage_protection: Support enabling of and setting limits for over
+ *	voltage situation detection. Detection can be configured for same
+ *	severities as over current protection.
+ * @set_under_voltage_protection: Support enabling of and setting limits for
+ *	under situation detection.
+ * @set_thermal_protection: Support enabling of and setting limits for over
+ *	temperature situation detection.
  *
  * @set_active_discharge: Set active discharge enable/disable of regulators.
  *
@@ -143,8 +169,15 @@ struct regulator_ops {
 	int (*get_current_limit) (struct regulator_dev *);
 
 	int (*set_input_current_limit) (struct regulator_dev *, int lim_uA);
-	int (*set_over_current_protection) (struct regulator_dev *);
-	int (*set_active_discharge) (struct regulator_dev *, bool enable);
+	int (*set_over_current_protection)(struct regulator_dev *, int lim_uA,
+					   int severity, bool enable);
+	int (*set_over_voltage_protection)(struct regulator_dev *, int lim_uV,
+					   int severity, bool enable);
+	int (*set_under_voltage_protection)(struct regulator_dev *, int lim_uV,
+					    int severity, bool enable);
+	int (*set_thermal_protection)(struct regulator_dev *, int lim,
+				      int severity, bool enable);
+	int (*set_active_discharge)(struct regulator_dev *, bool enable);
 
 	/* enable/disable regulator */
 	int (*enable) (struct regulator_dev *);
@@ -413,6 +446,128 @@ struct regulator_config {
 	struct gpio_desc *ena_gpiod;
 };
 
+/**
+ * struct regulator_err_state - regulator error/notification status
+ *
+ * @rdev:		Regulator which status the struct indicates.
+ * @notifs:		Events which have occurred on the regulator.
+ * @errors:		Errors which are active on the regulator.
+ * @possible_errs:	Errors which can be signaled (by given IRQ).
+ */
+struct regulator_err_state {
+	struct regulator_dev *rdev;
+	unsigned long notifs;
+	unsigned long errors;
+	int possible_errs;
+};
+
+/**
+ * struct regulator_irq_data - regulator error/notification status date
+ *
+ * @states:	Status structs for each of the associated regulators.
+ * @num_states:	Amount of associated regulators.
+ * @data:	Driver data pointer given at regulator_irq_desc.
+ * @opaque:	Value storage for IC driver. Core does not update this. ICs
+ *		may want to store status register value here at map_event and
+ *		compare contents at 'renable' callback to see if new problems
+ *		have been added to status. If that is the case it may be
+ *		desirable to return REGULATOR_ERROR_CLEARED and not
+ *		REGULATOR_ERROR_ON to allow IRQ fire again and to generate
+ *		notifications also for the new issues.
+ *
+ * This structure is passed to 'map_event' and 'renable' callbacks for
+ * reporting regulator status to core.
+ */
+struct regulator_irq_data {
+	struct regulator_err_state *states;
+	int num_states;
+	void *data;
+	long opaque;
+};
+
+/**
+ * struct regulator_irq_desc - notification sender for IRQ based events.
+ *
+ * @name:	The visible name for the IRQ
+ * @fatal_cnt:	If this IRQ is used to signal HW damaging condition it may be
+ *		best to shut-down regulator(s) or reboot the SOC if error
+ *		handling is repeatedly failing. If fatal_cnt is given the IRQ
+ *		handling is aborted if it fails for fatal_cnt times and die()
+ *		callback (if populated) or BUG() is called to try to prevent
+ *		further damage.
+ * @reread_ms:	The time which is waited before attempting to re-read status
+ *		at the worker if IC reading fails. Immediate re-read is done
+ *		if time is not specified.
+ * @irq_off_ms:	The time which IRQ is kept disabled before re-evaluating the
+ *		status for devices which keep IRQ disabled for duration of the
+ *		error. If this is not given the IRQ is left enabled and renable
+ *		is not called.
+ * @skip_off:	If set to true the IRQ handler will attempt to check if any of
+ *		the associated regulators are enabled prior to taking other
+ *		actions. If no regulators are enabled and this is set to true
+ *		a spurious IRQ is assumed and IRQ_NONE is returned.
+ * @high_prio:	Boolean to indicate that high priority WQ should be used.
+ * @data:	Driver private data pointer which will be passed as such to
+ *		the renable, map_event and die callbacks in regulator_irq_data.
+ * @die:	Protection callback. If IC status reading or recovery actions
+ *		fail fatal_cnt times this callback or BUG() is called. This
+ *		callback should implement a final protection attempt like
+ *		disabling the regulator. If protection succeeded this may
+ *		return 0. If anything else is returned the core assumes final
+ *		protection failed and calls BUG() as a last resort.
+ * @map_event:	Driver callback to map IRQ status into regulator devices with
+ *		events / errors. NOTE: callback MUST initialize both the
+ *		errors and notifs for all rdevs which it signals having
+ *		active events as core does not clean the map data.
+ *		REGULATOR_FAILED_RETRY can be returned to indicate that the
+ *		status reading from IC failed. If this is repeated for
+ *		fatal_cnt times the core will call die() callback or BUG()
+ *		as a last resort to protect the HW.
+ * @renable:	Optional callback to check status (if HW supports that) before
+ *		re-enabling IRQ. If implemented this should clear the error
+ *		flags so that errors fetched by regulator_get_error_flags()
+ *		are updated. If callback is not implemented then errors are
+ *		assumed to be cleared and IRQ is re-enabled.
+ *		REGULATOR_FAILED_RETRY can be returned to
+ *		indicate that the status reading from IC failed. If this is
+ *		repeated for 'fatal_cnt' times the core will call die()
+ *		callback or BUG() as a last resort to protect the HW.
+ *		Returning zero indicates that the problem in HW has been solved
+ *		and IRQ will be re-enabled. Returning REGULATOR_ERROR_ON
+ *		indicates the error condition is still active and keeps IRQ
+ *		disabled. Please note that returning REGULATOR_ERROR_ON does
+ *		not retrigger evaluating what events are active or resending
+ *		notifications. If this is needed you probably want to return
+ *		zero and allow IRQ to retrigger causing events to be
+ *		re-evaluated and re-sent.
+ *
+ * This structure is used for registering regulator IRQ notification helper.
+ */
+struct regulator_irq_desc {
+	const char *name;
+	int irq_flags;
+	int fatal_cnt;
+	int reread_ms;
+	int irq_off_ms;
+	bool skip_off;
+	bool high_prio;
+	void *data;
+
+	int (*die)(struct regulator_irq_data *rid);
+	int (*map_event)(int irq, struct regulator_irq_data *rid,
+			  unsigned long *dev_mask);
+	int (*renable)(struct regulator_irq_data *rid);
+};
+
+/*
+ * Return values for regulator IRQ helpers.
+ */
+enum {
+	REGULATOR_ERROR_CLEARED,
+	REGULATOR_FAILED_RETRY,
+	REGULATOR_ERROR_ON,
+};
+
 /*
  * struct coupling_desc
  *
@@ -477,6 +632,9 @@ struct regulator_dev {
 
 	/* time when this regulator was disabled last time */
 	ktime_t last_off;
+	int cached_err;
+	bool use_cached_err;
+	spinlock_t err_lock;
 };
 
 struct regulator_dev *
@@ -491,6 +649,16 @@ void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev);
 
 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 				  unsigned long event, void *data);
+void *devm_regulator_irq_helper(struct device *dev,
+				const struct regulator_irq_desc *d, int irq,
+				int irq_flags, int common_errs,
+				int *per_rdev_errs, struct regulator_dev **rdev,
+				int rdev_amount);
+void *regulator_irq_helper(struct device *dev,
+			   const struct regulator_irq_desc *d, int irq,
+			   int irq_flags, int common_errs, int *per_rdev_errs,
+			   struct regulator_dev **rdev, int rdev_amount);
+void regulator_irq_helper_cancel(void **handle);
 
 void *rdev_get_drvdata(struct regulator_dev *rdev);
 struct device *rdev_get_dev(struct regulator_dev *rdev);
@@ -551,4 +719,14 @@ int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
 
 int regulator_desc_list_voltage_linear(const struct regulator_desc *desc,
 				       unsigned int selector);
+
+#ifdef CONFIG_REGULATOR
+const char *rdev_get_name(struct regulator_dev *rdev);
+#else
+static inline const char *rdev_get_name(struct regulator_dev *rdev)
+{
+	return NULL;
+}
+#endif
+
 #endif
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 8a56f033b6cd..68b4a514a410 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -83,6 +83,14 @@ struct regulator_state {
 	bool changeable;
 };
 
+#define REGULATOR_NOTIF_LIMIT_DISABLE -1
+#define REGULATOR_NOTIF_LIMIT_ENABLE -2
+struct notification_limit {
+	int prot;
+	int err;
+	int warn;
+};
+
 /**
  * struct regulation_constraints - regulator operating constraints.
  *
@@ -100,6 +108,11 @@ struct regulator_state {
  * @ilim_uA: Maximum input current.
  * @system_load: Load that isn't captured by any consumer requests.
  *
+ * @over_curr_limits:		Limits for acting on over current.
+ * @over_voltage_limits:	Limits for acting on over voltage.
+ * @under_voltage_limits:	Limits for acting on under voltage.
+ * @temp_limits:		Limits for acting on over temperature.
+
  * @max_spread: Max possible spread between coupled regulators
  * @max_uV_step: Max possible step change in voltage
  * @valid_modes_mask: Mask of modes which may be configured by consumers.
@@ -116,6 +129,11 @@ struct regulator_state {
  * @pull_down: Enable pull down when regulator is disabled.
  * @over_current_protection: Auto disable on over current event.
  *
+ * @over_current_detection: Configure over current limits.
+ * @over_voltage_detection: Configure over voltage limits.
+ * @under_voltage_detection: Configure under voltage limits.
+ * @over_temp_detection: Configure over temperature limits.
+ *
  * @input_uV: Input voltage for regulator when supplied by another regulator.
  *
  * @state_disk: State for regulator when system is suspended in disk mode.
@@ -172,6 +190,10 @@ struct regulation_constraints {
 	struct regulator_state state_disk;
 	struct regulator_state state_mem;
 	struct regulator_state state_standby;
+	struct notification_limit over_curr_limits;
+	struct notification_limit over_voltage_limits;
+	struct notification_limit under_voltage_limits;
+	struct notification_limit temp_limits;
 	suspend_state_t initial_state; /* suspend state to set at init */
 
 	/* mode to set on startup */
@@ -193,6 +215,10 @@ struct regulation_constraints {
 	unsigned soft_start:1;	/* ramp voltage slowly */
 	unsigned pull_down:1;	/* pull down resistor when regulator off */
 	unsigned over_current_protection:1; /* auto disable on over current */
+	unsigned over_current_detection:1; /* notify on over current */
+	unsigned over_voltage_detection:1; /* notify on over voltage */
+	unsigned under_voltage_detection:1; /* notify on under voltage */
+	unsigned over_temp_detection:1; /* notify on over temperature */
 };
 
 /**
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index 3f6a0fcaa10c..7f4278fa21fe 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -326,6 +326,7 @@ int send_sig_mceerr(int code, void __user *, short, struct task_struct *);
 
 int force_sig_bnderr(void __user *addr, void __user *lower, void __user *upper);
 int force_sig_pkuerr(void __user *addr, u32 pkey);
+int force_sig_perf(void __user *addr, u32 type, u64 sig_data);
 
 int force_sig_ptrace_errno_trap(int errno, void __user *addr);
 
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 0dbfda8d99d0..201f88e3738b 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -40,6 +40,7 @@ enum siginfo_layout {
 	SIL_TIMER,
 	SIL_POLL,
 	SIL_FAULT,
+	SIL_FAULT_TRAPNO,
 	SIL_FAULT_MCEERR,
 	SIL_FAULT_BNDERR,
 	SIL_FAULT_PKUERR,
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 360a3bc767ca..74239d65c7fd 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -644,8 +644,8 @@ struct spi_controller {
 	int			*cs_gpios;
 	struct gpio_desc	**cs_gpiods;
 	bool			use_gpio_descriptors;
-	u8			unused_native_cs;
-	u8			max_native_cs;
+	s8			unused_native_cs;
+	s8			max_native_cs;
 
 	/* statistics */
 	struct spi_statistics	statistics;
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index d81fe8b364d0..61b622e334ee 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -368,6 +368,8 @@ struct rpc_xprt *	xprt_alloc(struct net *net, size_t size,
 				unsigned int num_prealloc,
 				unsigned int max_req);
 void			xprt_free(struct rpc_xprt *);
+void			xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task);
+bool			xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req);
 
 static inline int
 xprt_enable_swap(struct rpc_xprt *xprt)
diff --git a/include/linux/surface_aggregator/device.h b/include/linux/surface_aggregator/device.h
index 4441ad667c3f..6ff9c58b3e17 100644
--- a/include/linux/surface_aggregator/device.h
+++ b/include/linux/surface_aggregator/device.h
@@ -98,9 +98,9 @@ struct ssam_device_uid {
 		     | (((fun) != SSAM_ANY_FUN) ? SSAM_MATCH_FUNCTION : 0),	\
 	.domain   = d,								\
 	.category = cat,							\
-	.target   = ((tid) != SSAM_ANY_TID) ? (tid) : 0,			\
-	.instance = ((iid) != SSAM_ANY_IID) ? (iid) : 0,			\
-	.function = ((fun) != SSAM_ANY_FUN) ? (fun) : 0				\
+	.target   = __builtin_choose_expr((tid) != SSAM_ANY_TID, (tid), 0),	\
+	.instance = __builtin_choose_expr((iid) != SSAM_ANY_IID, (iid), 0),	\
+	.function = __builtin_choose_expr((fun) != SSAM_ANY_FUN, (fun), 0)
 
 /**
  * SSAM_VDEV() - Initialize a &struct ssam_device_id as virtual device with