Merge tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull non-MM updates from Andrew Morton:

 - "hung_task: extend blocking task stacktrace dump to semaphore" from
   Lance Yang enhances the hung task detector.

   The detector presently dumps the blocking tasks's stack when it is
   blocked on a mutex. Lance's series extends this to semaphores

 - "nilfs2: improve sanity checks in dirty state propagation" from
   Wentao Liang addresses a couple of minor flaws in nilfs2

 - "scripts/gdb: Fixes related to lx_per_cpu()" from Illia Ostapyshyn
   fixes a couple of issues in the gdb scripts

 - "Support kdump with LUKS encryption by reusing LUKS volume keys" from
   Coiby Xu addresses a usability problem with kdump.

   When the dump device is LUKS-encrypted, the kdump kernel may not have
   the keys to the encrypted filesystem. A full writeup of this is in
   the series [0/N] cover letter

 - "sysfs: add counters for lockups and stalls" from Max Kellermann adds
   /sys/kernel/hardlockup_count and /sys/kernel/hardlockup_count and
   /sys/kernel/rcu_stall_count

 - "fork: Page operation cleanups in the fork code" from Pasha Tatashin
   implements a number of code cleanups in fork.c

 - "scripts/gdb/symbols: determine KASLR offset on s390 during early
   boot" from Ilya Leoshkevich fixes some s390 issues in the gdb
   scripts

* tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (67 commits)
  llist: make llist_add_batch() a static inline
  delayacct: remove redundant code and adjust indentation
  squashfs: add optional full compressed block caching
  crash_dump, nvme: select CONFIGFS_FS as built-in
  scripts/gdb/symbols: determine KASLR offset on s390 during early boot
  scripts/gdb/symbols: factor out pagination_off()
  scripts/gdb/symbols: factor out get_vmlinux()
  kernel/panic.c: format kernel-doc comments
  mailmap: update and consolidate Casey Connolly's name and email
  nilfs2: remove wbc->for_reclaim handling
  fork: define a local GFP_VMAP_STACK
  fork: check charging success before zeroing stack
  fork: clean-up naming of vm_stack/vm_struct variables in vmap stacks code
  fork: clean-up ifdef logic around stack allocation
  kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count
  kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count
  x86/crash: make the page that stores the dm crypt keys inaccessible
  x86/crash: pass dm crypt keys to kdump kernel
  Revert "x86/mm: Remove unused __set_memory_prot()"
  crash_dump: retrieve dm crypt keys in kdump kernel
  ...

3 files changed, 43 insertions, 21 deletions

diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index f506965ea759..6edf4ef61636 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -141,7 +141,7 @@ LxCpus()
 class PerCpu(gdb.Function):
     """Return per-cpu variable.
 
-$lx_per_cpu("VAR"[, CPU]): Return the per-cpu variable called VAR for the
+$lx_per_cpu(VAR[, CPU]): Return the per-cpu variable called VAR for the
 given CPU number. If CPU is omitted, the CPU of the current context is used.
 Note that VAR has to be quoted as string."""
 
@@ -158,7 +158,7 @@ PerCpu()
 class PerCpuPtr(gdb.Function):
     """Return per-cpu pointer.
 
-$lx_per_cpu_ptr("VAR"[, CPU]): Return the per-cpu pointer called VAR for the
+$lx_per_cpu_ptr(VAR[, CPU]): Return the per-cpu pointer called VAR for the
 given CPU number. If CPU is omitted, the CPU of the current context is used.
 Note that VAR has to be quoted as string."""
 
diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
index b255177301e9..2332bd8eddf1 100644
--- a/scripts/gdb/linux/symbols.py
+++ b/scripts/gdb/linux/symbols.py
@@ -38,19 +38,13 @@ if hasattr(gdb, 'Breakpoint'):
             # Disable pagination while reporting symbol (re-)loading.
             # The console input is blocked in this context so that we would
             # get stuck waiting for the user to acknowledge paged output.
-            show_pagination = gdb.execute("show pagination", to_string=True)
-            pagination = show_pagination.endswith("on.\n")
-            gdb.execute("set pagination off")
-
-            if module_name in cmd.loaded_modules:
-                gdb.write("refreshing all symbols to reload module "
-                          "'{0}'\n".format(module_name))
-                cmd.load_all_symbols()
-            else:
-                cmd.load_module_symbols(module)
-
-            # restore pagination state
-            gdb.execute("set pagination %s" % ("on" if pagination else "off"))
+            with utils.pagination_off():
+                if module_name in cmd.loaded_modules:
+                    gdb.write("refreshing all symbols to reload module "
+                              "'{0}'\n".format(module_name))
+                    cmd.load_all_symbols()
+                else:
+                    cmd.load_module_symbols(module)
 
             return False
 
@@ -60,6 +54,18 @@ def get_vmcore_s390():
         vmcore_info = 0x0e0c
         paddr_vmcoreinfo_note = gdb.parse_and_eval("*(unsigned long long *)" +
                                                    hex(vmcore_info))
+        if paddr_vmcoreinfo_note == 0 or paddr_vmcoreinfo_note & 1:
+            # In the early boot case, extract vm_layout.kaslr_offset from the
+            # vmlinux image in physical memory.
+            if paddr_vmcoreinfo_note == 0:
+                kaslr_offset_phys = 0
+            else:
+                kaslr_offset_phys = paddr_vmcoreinfo_note - 1
+            with utils.pagination_off():
+                gdb.execute("symbol-file {0} -o {1}".format(
+                    utils.get_vmlinux(), hex(kaslr_offset_phys)))
+            kaslr_offset = gdb.parse_and_eval("vm_layout.kaslr_offset")
+            return "KERNELOFFSET=" + hex(kaslr_offset)[2:]
         inferior = gdb.selected_inferior()
         elf_note = inferior.read_memory(paddr_vmcoreinfo_note, 12)
         n_namesz, n_descsz, n_type = struct.unpack(">III", elf_note)
@@ -178,11 +184,7 @@ lx-symbols command."""
                 saved_states.append({'breakpoint': bp, 'enabled': bp.enabled})
 
         # drop all current symbols and reload vmlinux
-        orig_vmlinux = 'vmlinux'
-        for obj in gdb.objfiles():
-            if (obj.filename.endswith('vmlinux') or
-                obj.filename.endswith('vmlinux.debug')):
-                orig_vmlinux = obj.filename
+        orig_vmlinux = utils.get_vmlinux()
         gdb.execute("symbol-file", to_string=True)
         kerneloffset = get_kerneloffset()
         if kerneloffset is None:
diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
index 03ebdccf5f69..e11f6f67961a 100644
--- a/scripts/gdb/linux/utils.py
+++ b/scripts/gdb/linux/utils.py
@@ -200,7 +200,7 @@ def get_gdbserver_type():
 
     def probe_kgdb():
         try:
-            thread_info = gdb.execute("info thread 2", to_string=True)
+            thread_info = gdb.execute("info thread 1", to_string=True)
             return "shadowCPU" in thread_info
         except gdb.error:
             return False
@@ -251,3 +251,23 @@ def parse_vmcore(s):
     else:
         kerneloffset = int(match.group(1), 16)
     return VmCore(kerneloffset=kerneloffset)
+
+
+def get_vmlinux():
+    vmlinux = 'vmlinux'
+    for obj in gdb.objfiles():
+        if (obj.filename.endswith('vmlinux') or
+            obj.filename.endswith('vmlinux.debug')):
+            vmlinux = obj.filename
+    return vmlinux
+
+
+@contextlib.contextmanager
+def pagination_off():
+    show_pagination = gdb.execute("show pagination", to_string=True)
+    pagination = show_pagination.endswith("on.\n")
+    gdb.execute("set pagination off")
+    try:
+        yield
+    finally:
+        gdb.execute("set pagination %s" % ("on" if pagination else "off"))