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, 55 insertions, 0 deletions

diff --git a/scripts/gdb/linux/stackdepot.py b/scripts/gdb/linux/stackdepot.py
new file mode 100644
index 000000000000..047d329a6a12
--- /dev/null
+++ b/scripts/gdb/linux/stackdepot.py
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2023 MediaTek Inc.
+#
+# Authors:
+#  Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
+#
+
+import gdb
+from linux import utils, constants
+
+if constants.LX_CONFIG_STACKDEPOT:
+    stack_record_type = utils.CachedType('struct stack_record')
+    DEPOT_STACK_ALIGN = 4
+
+def stack_depot_fetch(handle):
+    global DEPOT_STACK_ALIGN
+    global stack_record_type
+
+    stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled')
+
+    if stack_depot_disabled:
+        raise gdb.GdbError("stack_depot_disabled\n")
+
+    handle_parts_t = gdb.lookup_type("union handle_parts")
+    parts = handle.cast(handle_parts_t)
+    offset = parts['offset'] << DEPOT_STACK_ALIGN
+    pool_index_cached = gdb.parse_and_eval('pool_index')
+
+    if parts['pool_index'] > pool_index_cached:
+        gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pool_index_cached, handle))
+        return gdb.Value(0), 0
+
+    stack_pools = gdb.parse_and_eval('stack_pools')
+
+    try:
+        pool = stack_pools[parts['pool_index']]
+        stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer())
+        size = int(stack['size'].cast(utils.get_ulong_type()))
+        return stack['entries'], size
+    except Exception as e:
+        gdb.write("%s\n" % e)
+        return gdb.Value(0), 0
+
+def stack_depot_print(handle):
+    if not constants.LX_CONFIG_STACKDEPOT:
+        raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled")
+
+    entries, nr_entries = stack_depot_fetch(handle)
+    if nr_entries > 0:
+        for i in range(0, nr_entries):
+            try:
+                gdb.execute("x /i 0x%x" % (int(entries[i])))
+            except Exception as e:
+                gdb.write("%s\n" % e)