Merge tag 'mm-nonmm-stable-2023-08-28-22-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - An extensive rework of kexec and crash Kconfig from Eric DeVolder
   ("refactor Kconfig to consolidate KEXEC and CRASH options")

 - kernel.h slimming work from Andy Shevchenko ("kernel.h: Split out a
   couple of macros to args.h")

 - gdb feature work from Kuan-Ying Lee ("Add GDB memory helper
   commands")

 - vsprintf inclusion rationalization from Andy Shevchenko
   ("lib/vsprintf: Rework header inclusions")

 - Switch the handling of kdump from a udev scheme to in-kernel
   handling, by Eric DeVolder ("crash: Kernel handling of CPU and memory
   hot un/plug")

 - Many singleton patches to various parts of the tree

* tag 'mm-nonmm-stable-2023-08-28-22-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (81 commits)
  document while_each_thread(), change first_tid() to use for_each_thread()
  drivers/char/mem.c: shrink character device's devlist[] array
  x86/crash: optimize CPU changes
  crash: change crash_prepare_elf64_headers() to for_each_possible_cpu()
  crash: hotplug support for kexec_load()
  x86/crash: add x86 crash hotplug support
  crash: memory and CPU hotplug sysfs attributes
  kexec: exclude elfcorehdr from the segment digest
  crash: add generic infrastructure for crash hotplug support
  crash: move a few code bits to setup support of crash hotplug
  kstrtox: consistently use _tolower()
  kill do_each_thread()
  nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse
  scripts/bloat-o-meter: count weak symbol sizes
  treewide: drop CONFIG_EMBEDDED
  lockdep: fix static memory detection even more
  lib/vsprintf: declare no_hash_pointers in sprintf.h
  lib/vsprintf: split out sprintf() and friends
  kernel/fork: stop playing lockless games for exe_file replacement
  adfs: delete unused "union adfs_dirtail" definition
  ...

4 files changed, 24 insertions, 42 deletions

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3ab75f36c037..53faa122b0f4 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -362,31 +362,13 @@ config IA64_HP_AML_NFW
 	  the "force" module parameter, e.g., with the "aml_nfw.force"
 	  kernel command line option.
 
-config KEXEC
-	bool "kexec system call"
-	depends on !SMP || HOTPLUG_CPU
-	select KEXEC_CORE
-	help
-	  kexec is a system call that implements the ability to shutdown your
-	  current kernel, and to start another kernel.  It is like a reboot
-	  but it is independent of the system firmware.   And like a reboot
-	  you can start any kernel with it, not just Linux.
-
-	  The name comes from the similarity to the exec system call.
-
-	  It is an ongoing process to be certain the hardware in a machine
-	  is properly shutdown, so do not be surprised if this code does not
-	  initially work for you.  As of this writing the exact hardware
-	  interface is strongly in flux, so no good recommendation can be
-	  made.
+endmenu
 
-config CRASH_DUMP
-	  bool "kernel crash dumps"
-	  depends on IA64_MCA_RECOVERY && (!SMP || HOTPLUG_CPU)
-	  help
-	    Generate crash dump after being started by kexec.
+config ARCH_SUPPORTS_KEXEC
+	def_bool !SMP || HOTPLUG_CPU
 
-endmenu
+config ARCH_SUPPORTS_CRASH_DUMP
+	def_bool IA64_MCA_RECOVERY && (!SMP || HOTPLUG_CPU)
 
 menu "Power management and ACPI options"
 
diff --git a/arch/ia64/include/asm/cmpxchg.h b/arch/ia64/include/asm/cmpxchg.h
index 8b2e644ef6a1..d85ee1a0a227 100644
--- a/arch/ia64/include/asm/cmpxchg.h
+++ b/arch/ia64/include/asm/cmpxchg.h
@@ -13,4 +13,21 @@
 #define arch_cmpxchg_local		arch_cmpxchg
 #define arch_cmpxchg64_local		arch_cmpxchg64
 
+#ifdef CONFIG_IA64_DEBUG_CMPXCHG
+# define CMPXCHG_BUGCHECK_DECL	int _cmpxchg_bugcheck_count = 128;
+# define CMPXCHG_BUGCHECK(v)						\
+do {									\
+	if (_cmpxchg_bugcheck_count-- <= 0) {				\
+		void *ip;						\
+		extern int _printk(const char *fmt, ...);		\
+		ip = (void *) ia64_getreg(_IA64_REG_IP);		\
+		_printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
+		break;							\
+	}								\
+} while (0)
+#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
+# define CMPXCHG_BUGCHECK_DECL
+# define CMPXCHG_BUGCHECK(v)
+#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
+
 #endif /* _ASM_IA64_CMPXCHG_H */
diff --git a/arch/ia64/include/uapi/asm/cmpxchg.h b/arch/ia64/include/uapi/asm/cmpxchg.h
index 85cba138311f..a59b5de6eec6 100644
--- a/arch/ia64/include/uapi/asm/cmpxchg.h
+++ b/arch/ia64/include/uapi/asm/cmpxchg.h
@@ -133,23 +133,6 @@ extern long ia64_cmpxchg_called_with_bad_pointer(void);
 #define cmpxchg64_local		cmpxchg64
 #endif
 
-#ifdef CONFIG_IA64_DEBUG_CMPXCHG
-# define CMPXCHG_BUGCHECK_DECL	int _cmpxchg_bugcheck_count = 128;
-# define CMPXCHG_BUGCHECK(v)						\
-do {									\
-	if (_cmpxchg_bugcheck_count-- <= 0) {				\
-		void *ip;						\
-		extern int _printk(const char *fmt, ...);		\
-		ip = (void *) ia64_getreg(_IA64_REG_IP);		\
-		_printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
-		break;							\
-	}								\
-} while (0)
-#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
-# define CMPXCHG_BUGCHECK_DECL
-# define CMPXCHG_BUGCHECK(v)
-#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
-
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _UAPI_ASM_IA64_CMPXCHG_H */
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 92ede80d17fe..2671688d349a 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1630,10 +1630,10 @@ default_monarch_init_process(struct notifier_block *self, unsigned long val, voi
 	}
 	printk("\n\n");
 	if (read_trylock(&tasklist_lock)) {
-		do_each_thread (g, t) {
+		for_each_process_thread(g, t) {
 			printk("\nBacktrace of pid %d (%s)\n", t->pid, t->comm);
 			show_stack(t, NULL, KERN_DEFAULT);
-		} while_each_thread (g, t);
+		}
 		read_unlock(&tasklist_lock);
 	}
 	/* FIXME: This will not restore zapped printk locks. */