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
  ...

tools/testing/selftests/proc/proc-empty-vm.c

@@ -1,3 +1,4 @@
+#if defined __amd64__ || defined __i386__
 /*
  * Copyright (c) 2022 Alexey Dobriyan <adobriyan@gmail.com>
  *
@@ -37,6 +38,10 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
+#ifdef __amd64__
+#define TEST_VSYSCALL
+#endif
+
 /*
  * 0: vsyscall VMA doesn't exist	vsyscall=none
  * 1: vsyscall VMA is --xp		vsyscall=xonly
@@ -119,6 +124,7 @@ static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___)
 	_exit(EXIT_FAILURE);
 }
 
+#ifdef TEST_VSYSCALL
 static void sigaction_SIGSEGV_vsyscall(int _, siginfo_t *__, void *___)
 {
 	_exit(g_vsyscall);
@@ -170,6 +176,7 @@ static void vsyscall(void)
 		exit(1);
 	}
 }
+#endif
 
 static int test_proc_pid_maps(pid_t pid)
 {
@@ -299,7 +306,9 @@ int main(void)
 {
 	int rv = EXIT_SUCCESS;
 
+#ifdef TEST_VSYSCALL
 	vsyscall();
+#endif
 
 	switch (g_vsyscall) {
 	case 0:
@@ -346,6 +355,14 @@ int main(void)
 
 #ifdef __amd64__
 		munmap(NULL, ((size_t)1 << 47) - 4096);
+#elif defined __i386__
+		{
+			size_t len;
+
+			for (len = -4096;; len -= 4096) {
+				munmap(NULL, len);
+			}
+		}
 #else
 #error "implement 'unmap everything'"
 #endif
@@ -386,3 +403,9 @@ int main(void)
 
 	return rv;
 }
+#else
+int main(void)
+{
+	return 4;
+}
+#endif