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
  ...

10 files changed, 29 insertions, 50 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 938294c996dc..21edd664689e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -592,41 +592,21 @@ config PPC64_SUPPORTS_MEMORY_FAILURE
 	default "y" if PPC_POWERNV
 	select ARCH_SUPPORTS_MEMORY_FAILURE
 
-config KEXEC
-	bool "kexec system call"
-	depends on PPC_BOOK3S || PPC_E500 || (44x && !SMP)
-	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.
-
-config KEXEC_FILE
-	bool "kexec file based system call"
-	select KEXEC_CORE
-	select HAVE_IMA_KEXEC if IMA
-	select KEXEC_ELF
-	depends on PPC64
-	depends on CRYPTO=y
-	depends on CRYPTO_SHA256=y
-	help
-	  This is a new version of the kexec system call. This call is
-	  file based and takes in file descriptors as system call arguments
-	  for kernel and initramfs as opposed to a list of segments as is the
-	  case for the older kexec call.
+config ARCH_SUPPORTS_KEXEC
+	def_bool PPC_BOOK3S || PPC_E500 || (44x && !SMP)
+
+config ARCH_SUPPORTS_KEXEC_FILE
+	def_bool PPC64 && CRYPTO=y && CRYPTO_SHA256=y
 
-config ARCH_HAS_KEXEC_PURGATORY
+config ARCH_SUPPORTS_KEXEC_PURGATORY
 	def_bool KEXEC_FILE
 
+config ARCH_SELECTS_KEXEC_FILE
+	def_bool y
+	depends on KEXEC_FILE
+	select KEXEC_ELF
+	select HAVE_IMA_KEXEC if IMA
+
 config PPC64_BIG_ENDIAN_ELF_ABI_V2
 	# Option is available to BFD, but LLD does not support ELFv1 so this is
 	# always true there.
@@ -686,14 +666,13 @@ config RELOCATABLE_TEST
 	  loaded at, which tends to be non-zero and therefore test the
 	  relocation code.
 
-config CRASH_DUMP
-	bool "Build a dump capture kernel"
-	depends on PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
+config ARCH_SUPPORTS_CRASH_DUMP
+	def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
+
+config ARCH_SELECTS_CRASH_DUMP
+	def_bool y
+	depends on CRASH_DUMP
 	select RELOCATABLE if PPC64 || 44x || PPC_85xx
-	help
-	  Build a kernel suitable for use as a dump capture kernel.
-	  The same kernel binary can be used as production kernel and dump
-	  capture kernel.
 
 config FA_DUMP
 	bool "Firmware-assisted dump"
diff --git a/arch/powerpc/configs/40x/klondike_defconfig b/arch/powerpc/configs/40x/klondike_defconfig
index acafbb8f6808..a974d1e945cc 100644
--- a/arch/powerpc/configs/40x/klondike_defconfig
+++ b/arch/powerpc/configs/40x/klondike_defconfig
@@ -4,7 +4,7 @@ CONFIG_LOG_BUF_SHIFT=14
 CONFIG_SYSFS_DEPRECATED=y
 CONFIG_SYSFS_DEPRECATED_V2=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_APM8018X=y
diff --git a/arch/powerpc/configs/44x/fsp2_defconfig b/arch/powerpc/configs/44x/fsp2_defconfig
index 3fdfbb29b854..5492537f4c6c 100644
--- a/arch/powerpc/configs/44x/fsp2_defconfig
+++ b/arch/powerpc/configs/44x/fsp2_defconfig
@@ -15,7 +15,7 @@ CONFIG_BLK_DEV_INITRD=y
 # CONFIG_RD_LZ4 is not set
 CONFIG_KALLSYMS_ALL=y
 CONFIG_BPF_SYSCALL=y
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 CONFIG_PROFILING=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
diff --git a/arch/powerpc/configs/52xx/tqm5200_defconfig b/arch/powerpc/configs/52xx/tqm5200_defconfig
index e6735b945327..688f703d8e22 100644
--- a/arch/powerpc/configs/52xx/tqm5200_defconfig
+++ b/arch/powerpc/configs/52xx/tqm5200_defconfig
@@ -3,7 +3,7 @@ CONFIG_LOG_BUF_SHIFT=14
 CONFIG_BLK_DEV_INITRD=y
 # CONFIG_KALLSYMS is not set
 # CONFIG_EPOLL is not set
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODVERSIONS=y
diff --git a/arch/powerpc/configs/mgcoge_defconfig b/arch/powerpc/configs/mgcoge_defconfig
index 2101bfe6db94..f65001e7877f 100644
--- a/arch/powerpc/configs/mgcoge_defconfig
+++ b/arch/powerpc/configs/mgcoge_defconfig
@@ -9,7 +9,7 @@ CONFIG_BLK_DEV_INITRD=y
 # CONFIG_RD_GZIP is not set
 CONFIG_KALLSYMS_ALL=y
 # CONFIG_PCSPKR_PLATFORM is not set
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 CONFIG_PARTITION_ADVANCED=y
 # CONFIG_PPC_PMAC is not set
 CONFIG_PPC_82xx=y
diff --git a/arch/powerpc/configs/microwatt_defconfig b/arch/powerpc/configs/microwatt_defconfig
index 795a127908e7..a64fb1ef8c75 100644
--- a/arch/powerpc/configs/microwatt_defconfig
+++ b/arch/powerpc/configs/microwatt_defconfig
@@ -8,7 +8,7 @@ CONFIG_CGROUPS=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_KALLSYMS_ALL=y
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 # CONFIG_VM_EVENT_COUNTERS is not set
 # CONFIG_SLUB_DEBUG is not set
 # CONFIG_COMPAT_BRK is not set
diff --git a/arch/powerpc/configs/ps3_defconfig b/arch/powerpc/configs/ps3_defconfig
index 1ea732c19235..2b175ddf82f0 100644
--- a/arch/powerpc/configs/ps3_defconfig
+++ b/arch/powerpc/configs/ps3_defconfig
@@ -3,7 +3,7 @@ CONFIG_POSIX_MQUEUE=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
-CONFIG_EMBEDDED=y
+CONFIG_EXPERT=y
 # CONFIG_PERF_EVENTS is not set
 CONFIG_PROFILING=y
 CONFIG_PPC64=y
diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h
index f257cacb49a9..ba1a5974e714 100644
--- a/arch/powerpc/include/asm/irq.h
+++ b/arch/powerpc/include/asm/irq.h
@@ -55,7 +55,7 @@ int irq_choose_cpu(const struct cpumask *mask);
 
 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI)
 extern void arch_trigger_cpumask_backtrace(const cpumask_t *mask,
-					   bool exclude_self);
+					   int exclude_cpu);
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 #endif
 
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index 5de8597eaab8..b15f15dcacb5 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -221,8 +221,8 @@ static void raise_backtrace_ipi(cpumask_t *mask)
 	}
 }
 
-void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
+void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu)
 {
-	nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_backtrace_ipi);
+	nmi_trigger_cpumask_backtrace(mask, exclude_cpu, raise_backtrace_ipi);
 }
 #endif /* defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_NMI_IPI) */
diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index edb2dd1f53eb..8c464a5d8246 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -245,7 +245,7 @@ static void watchdog_smp_panic(int cpu)
 			__cpumask_clear_cpu(c, &wd_smp_cpus_ipi);
 		}
 	} else {
-		trigger_allbutself_cpu_backtrace();
+		trigger_allbutcpu_cpu_backtrace(cpu);
 		cpumask_clear(&wd_smp_cpus_ipi);
 	}
 
@@ -416,7 +416,7 @@ DEFINE_INTERRUPT_HANDLER_NMI(soft_nmi_interrupt)
 		xchg(&__wd_nmi_output, 1); // see wd_lockup_ipi
 
 		if (sysctl_hardlockup_all_cpu_backtrace)
-			trigger_allbutself_cpu_backtrace();
+			trigger_allbutcpu_cpu_backtrace(cpu);
 
 		if (hardlockup_panic)
 			nmi_panic(regs, "Hard LOCKUP");