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
  ...

1 files changed, 18 insertions, 39 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"