Merge tag 'driver-core-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the set of driver core and kernfs changes for 6.2-rc1.

  The "big" change in here is the addition of a new macro,
  container_of_const() that will preserve the "const-ness" of a pointer
  passed into it.

  The "problem" of the current container_of() macro is that if you pass
  in a "const *", out of it can comes a non-const pointer unless you
  specifically ask for it. For many usages, we want to preserve the
  "const" attribute by using the same call. For a specific example, this
  series changes the kobj_to_dev() macro to use it, allowing it to be
  used no matter what the const value is. This prevents every subsystem
  from having to declare 2 different individual macros (i.e.
  kobj_const_to_dev() and kobj_to_dev()) and having the compiler enforce
  the const value at build time, which having 2 macros would not do
  either.

  The driver for all of this have been discussions with the Rust kernel
  developers as to how to properly mark driver core, and kobject,
  objects as being "non-mutable". The changes to the kobject and driver
  core in this pull request are the result of that, as there are lots of
  paths where kobjects and device pointers are not modified at all, so
  marking them as "const" allows the compiler to enforce this.

  So, a nice side affect of the Rust development effort has been already
  to clean up the driver core code to be more obvious about object
  rules.

  All of this has been bike-shedded in quite a lot of detail on lkml
  with different names and implementations resulting in the tiny version
  we have in here, much better than my original proposal. Lots of
  subsystem maintainers have acked the changes as well.

  Other than this change, included in here are smaller stuff like:

   - kernfs fixes and updates to handle lock contention better

   - vmlinux.lds.h fixes and updates

   - sysfs and debugfs documentation updates

   - device property updates

  All of these have been in the linux-next tree for quite a while with
  no problems"

* tag 'driver-core-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (58 commits)
  device property: Fix documentation for fwnode_get_next_parent()
  firmware_loader: fix up to_fw_sysfs() to preserve const
  usb.h: take advantage of container_of_const()
  device.h: move kobj_to_dev() to use container_of_const()
  container_of: add container_of_const() that preserves const-ness of the pointer
  driver core: fix up missed drivers/s390/char/hmcdrv_dev.c class.devnode() conversion.
  driver core: fix up missed scsi/cxlflash class.devnode() conversion.
  driver core: fix up some missing class.devnode() conversions.
  driver core: make struct class.devnode() take a const *
  driver core: make struct class.dev_uevent() take a const *
  cacheinfo: Remove of_node_put() for fw_token
  device property: Add a blank line in Kconfig of tests
  device property: Rename goto label to be more precise
  device property: Move PROPERTY_ENTRY_BOOL() a bit down
  device property: Get rid of __PROPERTY_ENTRY_ARRAY_EL*SIZE*()
  kernfs: fix all kernel-doc warnings and multiple typos
  driver core: pass a const * into of_device_uevent()
  kobject: kset_uevent_ops: make name() callback take a const *
  kobject: kset_uevent_ops: make filter() callback take a const *
  kobject: make kobject_namespace take a const *
  ...

1 files changed, 94 insertions, 140 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 475507093645..a94219e9916f 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -199,100 +199,114 @@
 # endif
 #endif
 
+#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)	\
+	_BEGIN_##_label_ = .;						\
+	KEEP(*(_sec_))							\
+	_END_##_label_ = .;
+
+#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)	\
+	_label_##_BEGIN_ = .;						\
+	KEEP(*(_sec_))							\
+	_label_##_END_ = .;
+
+#define BOUNDED_SECTION_BY(_sec_, _label_)				\
+	BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
+
+#define BOUNDED_SECTION(_sec)	 BOUNDED_SECTION_BY(_sec, _sec)
+
+#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
+	_HDR_##_label_	= .;						\
+	KEEP(*(.gnu.linkonce.##_sec_))					\
+	BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
+
+#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
+	_label_##_HDR_ = .;						\
+	KEEP(*(.gnu.linkonce.##_sec_))					\
+	BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
+
+#define HEADERED_SECTION_BY(_sec_, _label_)				\
+	HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
+
+#define HEADERED_SECTION(_sec)	 HEADERED_SECTION_BY(_sec, _sec)
+
 #ifdef CONFIG_TRACE_BRANCH_PROFILING
-#define LIKELY_PROFILE()	__start_annotated_branch_profile = .;	\
-				KEEP(*(_ftrace_annotated_branch))	\
-				__stop_annotated_branch_profile = .;
+#define LIKELY_PROFILE()						\
+	BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
 #else
 #define LIKELY_PROFILE()
 #endif
 
 #ifdef CONFIG_PROFILE_ALL_BRANCHES
-#define BRANCH_PROFILE()	__start_branch_profile = .;		\
-				KEEP(*(_ftrace_branch))			\
-				__stop_branch_profile = .;
+#define BRANCH_PROFILE()					\
+	BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
 #else
 #define BRANCH_PROFILE()
 #endif
 
 #ifdef CONFIG_KPROBES
-#define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
-				__start_kprobe_blacklist = .;		      \
-				KEEP(*(_kprobe_blacklist))		      \
-				__stop_kprobe_blacklist = .;
+#define KPROBE_BLACKLIST()				\
+	. = ALIGN(8);					\
+	BOUNDED_SECTION(_kprobe_blacklist)
 #else
 #define KPROBE_BLACKLIST()
 #endif
 
 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
-#define ERROR_INJECT_WHITELIST()	STRUCT_ALIGN();			      \
-			__start_error_injection_whitelist = .;		      \
-			KEEP(*(_error_injection_whitelist))		      \
-			__stop_error_injection_whitelist = .;
+#define ERROR_INJECT_WHITELIST()			\
+	STRUCT_ALIGN();					\
+	BOUNDED_SECTION(_error_injection_whitelist)
 #else
 #define ERROR_INJECT_WHITELIST()
 #endif
 
 #ifdef CONFIG_EVENT_TRACING
-#define FTRACE_EVENTS()	. = ALIGN(8);					\
-			__start_ftrace_events = .;			\
-			KEEP(*(_ftrace_events))				\
-			__stop_ftrace_events = .;			\
-			__start_ftrace_eval_maps = .;			\
-			KEEP(*(_ftrace_eval_map))			\
-			__stop_ftrace_eval_maps = .;
+#define FTRACE_EVENTS()							\
+	. = ALIGN(8);							\
+	BOUNDED_SECTION(_ftrace_events)					\
+	BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
 #else
 #define FTRACE_EVENTS()
 #endif
 
 #ifdef CONFIG_TRACING
-#define TRACE_PRINTKS()	 __start___trace_bprintk_fmt = .;      \
-			 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
-			 __stop___trace_bprintk_fmt = .;
-#define TRACEPOINT_STR() __start___tracepoint_str = .;	\
-			 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
-			 __stop___tracepoint_str = .;
+#define TRACE_PRINTKS()		BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
+#define TRACEPOINT_STR()	BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
 #else
 #define TRACE_PRINTKS()
 #define TRACEPOINT_STR()
 #endif
 
 #ifdef CONFIG_FTRACE_SYSCALLS
-#define TRACE_SYSCALLS() . = ALIGN(8);					\
-			 __start_syscalls_metadata = .;			\
-			 KEEP(*(__syscalls_metadata))			\
-			 __stop_syscalls_metadata = .;
+#define TRACE_SYSCALLS()			\
+	. = ALIGN(8);				\
+	BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
 #else
 #define TRACE_SYSCALLS()
 #endif
 
 #ifdef CONFIG_BPF_EVENTS
-#define BPF_RAW_TP() STRUCT_ALIGN();					\
-			 __start__bpf_raw_tp = .;			\
-			 KEEP(*(__bpf_raw_tp_map))			\
-			 __stop__bpf_raw_tp = .;
+#define BPF_RAW_TP() STRUCT_ALIGN();				\
+	BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
 #else
 #define BPF_RAW_TP()
 #endif
 
 #ifdef CONFIG_SERIAL_EARLYCON
-#define EARLYCON_TABLE() . = ALIGN(8);				\
-			 __earlycon_table = .;			\
-			 KEEP(*(__earlycon_table))		\
-			 __earlycon_table_end = .;
+#define EARLYCON_TABLE()						\
+	. = ALIGN(8);							\
+	BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
 #else
 #define EARLYCON_TABLE()
 #endif
 
 #ifdef CONFIG_SECURITY
-#define LSM_TABLE()	. = ALIGN(8);					\
-			__start_lsm_info = .;				\
-			KEEP(*(.lsm_info.init))				\
-			__end_lsm_info = .;
-#define EARLY_LSM_TABLE()	. = ALIGN(8);				\
-			__start_early_lsm_info = .;			\
-			KEEP(*(.early_lsm_info.init))			\
-			__end_early_lsm_info = .;
+#define LSM_TABLE()					\
+	. = ALIGN(8);					\
+	BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
+
+#define EARLY_LSM_TABLE()						\
+	. = ALIGN(8);							\
+	BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
 #else
 #define LSM_TABLE()
 #define EARLY_LSM_TABLE()
@@ -318,9 +332,8 @@
 #ifdef CONFIG_ACPI
 #define ACPI_PROBE_TABLE(name)						\
 	. = ALIGN(8);							\
-	__##name##_acpi_probe_table = .;				\
-	KEEP(*(__##name##_acpi_probe_table))				\
-	__##name##_acpi_probe_table_end = .;
+	BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table,		\
+				   __##name##_acpi_probe_table,, _end)
 #else
 #define ACPI_PROBE_TABLE(name)
 #endif
@@ -328,9 +341,8 @@
 #ifdef CONFIG_THERMAL
 #define THERMAL_TABLE(name)						\
 	. = ALIGN(8);							\
-	__##name##_thermal_table = .;					\
-	KEEP(*(__##name##_thermal_table))				\
-	__##name##_thermal_table_end = .;
+	BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table,		\
+				   __##name##_thermal_table,, _end)
 #else
 #define THERMAL_TABLE(name)
 #endif
@@ -360,12 +372,8 @@
 	*(__tracepoints)						\
 	/* implement dynamic printk debug */				\
 	. = ALIGN(8);							\
-	__start___dyndbg_classes = .;					\
-	KEEP(*(__dyndbg_classes))					\
-	__stop___dyndbg_classes = .;					\
-	__start___dyndbg = .;						\
-	KEEP(*(__dyndbg))						\
-	__stop___dyndbg = .;						\
+	BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes)		\
+	BOUNDED_SECTION_BY(__dyndbg, ___dyndbg)				\
 	LIKELY_PROFILE()		       				\
 	BRANCH_PROFILE()						\
 	TRACE_PRINTKS()							\
@@ -408,19 +416,13 @@
 
 #define JUMP_TABLE_DATA							\
 	. = ALIGN(8);							\
-	__start___jump_table = .;					\
-	KEEP(*(__jump_table))						\
-	__stop___jump_table = .;
+	BOUNDED_SECTION_BY(__jump_table, ___jump_table)
 
 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 #define STATIC_CALL_DATA						\
 	. = ALIGN(8);							\
-	__start_static_call_sites = .;					\
-	KEEP(*(.static_call_sites))					\
-	__stop_static_call_sites = .;					\
-	__start_static_call_tramp_key = .;				\
-	KEEP(*(.static_call_tramp_key))					\
-	__stop_static_call_tramp_key = .;
+	BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites)	\
+	BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
 #else
 #define STATIC_CALL_DATA
 #endif
@@ -446,9 +448,7 @@
 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
 #define KCFI_TRAPS							\
 	__kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) {		\
-		__start___kcfi_traps = .;				\
-		KEEP(*(.kcfi_traps))					\
-		__stop___kcfi_traps = .;				\
+		BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps)		\
 	}
 #else
 #define KCFI_TRAPS
@@ -466,9 +466,7 @@
 		SCHED_DATA						\
 		RO_AFTER_INIT_DATA	/* Read only after init */	\
 		. = ALIGN(8);						\
-		__start___tracepoints_ptrs = .;				\
-		KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
-		__stop___tracepoints_ptrs = .;				\
+		BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
 		*(__tracepoints_strings)/* Tracepoints: strings */	\
 	}								\
 									\
@@ -478,30 +476,14 @@
 									\
 	/* PCI quirks */						\
 	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
-		__start_pci_fixups_early = .;				\
-		KEEP(*(.pci_fixup_early))				\
-		__end_pci_fixups_early = .;				\
-		__start_pci_fixups_header = .;				\
-		KEEP(*(.pci_fixup_header))				\
-		__end_pci_fixups_header = .;				\
-		__start_pci_fixups_final = .;				\
-		KEEP(*(.pci_fixup_final))				\
-		__end_pci_fixups_final = .;				\
-		__start_pci_fixups_enable = .;				\
-		KEEP(*(.pci_fixup_enable))				\
-		__end_pci_fixups_enable = .;				\
-		__start_pci_fixups_resume = .;				\
-		KEEP(*(.pci_fixup_resume))				\
-		__end_pci_fixups_resume = .;				\
-		__start_pci_fixups_resume_early = .;			\
-		KEEP(*(.pci_fixup_resume_early))			\
-		__end_pci_fixups_resume_early = .;			\
-		__start_pci_fixups_suspend = .;				\
-		KEEP(*(.pci_fixup_suspend))				\
-		__end_pci_fixups_suspend = .;				\
-		__start_pci_fixups_suspend_late = .;			\
-		KEEP(*(.pci_fixup_suspend_late))			\
-		__end_pci_fixups_suspend_late = .;			\
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early,  _pci_fixups_early,  __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final,  _pci_fixups_final,  __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
+		BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
 	}								\
 									\
 	FW_LOADER_BUILT_IN_DATA						\
@@ -551,16 +533,12 @@
 									\
 	/* Built-in module parameters. */				\
 	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
-		__start___param = .;					\
-		KEEP(*(__param))					\
-		__stop___param = .;					\
+		BOUNDED_SECTION_BY(__param, ___param)			\
 	}								\
 									\
 	/* Built-in module versions. */					\
 	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
-		__start___modver = .;					\
-		KEEP(*(__modver))					\
-		__stop___modver = .;					\
+		BOUNDED_SECTION_BY(__modver, ___modver)			\
 	}								\
 									\
 	KCFI_TRAPS							\
@@ -670,9 +648,7 @@
 #define EXCEPTION_TABLE(align)						\
 	. = ALIGN(align);						\
 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
-		__start___ex_table = .;					\
-		KEEP(*(__ex_table))					\
-		__stop___ex_table = .;					\
+		BOUNDED_SECTION_BY(__ex_table, ___ex_table)		\
 	}
 
 /*
@@ -681,9 +657,7 @@
 #ifdef CONFIG_DEBUG_INFO_BTF
 #define BTF								\
 	.BTF : AT(ADDR(.BTF) - LOAD_OFFSET) {				\
-		__start_BTF = .;					\
-		KEEP(*(.BTF))						\
-		__stop_BTF = .;						\
+		BOUNDED_SECTION_BY(.BTF, _BTF)				\
 	}								\
 	. = ALIGN(4);							\
 	.BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) {			\
@@ -860,9 +834,7 @@
 #define BUG_TABLE							\
 	. = ALIGN(8);							\
 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
-		__start___bug_table = .;				\
-		KEEP(*(__bug_table))					\
-		__stop___bug_table = .;					\
+		BOUNDED_SECTION_BY(__bug_table, ___bug_table)		\
 	}
 #else
 #define BUG_TABLE
@@ -872,15 +844,11 @@
 #define ORC_UNWIND_TABLE						\
 	. = ALIGN(4);							\
 	.orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) {	\
-		__start_orc_unwind_ip = .;				\
-		KEEP(*(.orc_unwind_ip))					\
-		__stop_orc_unwind_ip = .;				\
+		BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip)	\
 	}								\
 	. = ALIGN(2);							\
 	.orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) {		\
-		__start_orc_unwind = .;					\
-		KEEP(*(.orc_unwind))					\
-		__stop_orc_unwind = .;					\
+		BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind)		\
 	}								\
 	text_size = _etext - _stext;					\
 	. = ALIGN(4);							\
@@ -898,9 +866,7 @@
 #ifdef CONFIG_FW_LOADER
 #define FW_LOADER_BUILT_IN_DATA						\
 	.builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) {	\
-		__start_builtin_fw = .;					\
-		KEEP(*(.builtin_fw))					\
-		__end_builtin_fw = .;					\
+		BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
 	}
 #else
 #define FW_LOADER_BUILT_IN_DATA
@@ -910,9 +876,7 @@
 #define TRACEDATA							\
 	. = ALIGN(4);							\
 	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
-		__tracedata_start = .;					\
-		KEEP(*(.tracedata))					\
-		__tracedata_end = .;					\
+		BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
 	}
 #else
 #define TRACEDATA
@@ -921,9 +885,7 @@
 #ifdef CONFIG_PRINTK_INDEX
 #define PRINTK_INDEX							\
 	.printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) {		\
-		__start_printk_index = .;				\
-		*(.printk_index)					\
-		__stop_printk_index = .;				\
+		BOUNDED_SECTION_BY(.printk_index, _printk_index)	\
 	}
 #else
 #define PRINTK_INDEX
@@ -931,17 +893,13 @@
 
 #define NOTES								\
 	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
-		__start_notes = .;					\
-		KEEP(*(.note.*))					\
-		__stop_notes = .;					\
+		BOUNDED_SECTION_BY(.note.*, _notes)			\
 	} NOTES_HEADERS							\
 	NOTES_HEADERS_RESTORE
 
 #define INIT_SETUP(initsetup_align)					\
 		. = ALIGN(initsetup_align);				\
-		__setup_start = .;					\
-		KEEP(*(.init.setup))					\
-		__setup_end = .;
+		BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end)
 
 #define INIT_CALLS_LEVEL(level)						\
 		__initcall##level##_start = .;				\
@@ -963,16 +921,12 @@
 		__initcall_end = .;
 
 #define CON_INITCALL							\
-		__con_initcall_start = .;				\
-		KEEP(*(.con_initcall.init))				\
-		__con_initcall_end = .;
+	BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
 
 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 #define KUNIT_TABLE()							\
 		. = ALIGN(8);						\
-		__kunit_suites_start = .;				\
-		KEEP(*(.kunit_test_suites))				\
-		__kunit_suites_end = .;
+		BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
 
 #ifdef CONFIG_BLK_DEV_INITRD
 #define INIT_RAM_FS							\