Merge tag 's390-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:

 - Support for kernel address space layout randomization

 - Add support for kernel image signature verification

 - Convert s390 to the generic get_user_pages_fast code

 - Convert s390 to the stack unwind API analog to x86

 - Add support for CPU directed interrupts for PCI devices

 - Provide support for MIO instructions to the PCI base layer, this will
   allow the use of direct PCI mappings in user space code

 - Add the basic KVM guest ultravisor interface for protected VMs

 - Add AT_HWCAP bits for several new hardware capabilities

 - Update the CPU measurement facility counter definitions to SVN 6

 - Arnds cleanup patches for his quest to get LLVM compiles working

 - A vfio-ccw update with bug fixes and support for halt and clear

 - Improvements for the hardware TRNG code

 - Another round of cleanup for the QDIO layer

 - Numerous cleanups and bug fixes

* tag 's390-5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (98 commits)
  s390/vdso: drop unnecessary cc-ldoption
  s390: fix clang -Wpointer-sign warnigns in boot code
  s390: drop CONFIG_VIRT_TO_BUS
  s390: boot, purgatory: pass $(CLANG_FLAGS) where needed
  s390: only build for new CPUs with clang
  s390: simplify disabled_wait
  s390/ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
  s390/unwind: introduce stack unwind API
  s390/opcodes: add missing instructions to the disassembler
  s390/bug: add entry size to the __bug_table section
  s390: use proper expoline sections for .dma code
  s390/nospec: rename assembler generated expoline thunks
  s390: add missing ENDPROC statements to assembler functions
  locking/lockdep: check for freed initmem in static_obj()
  s390/kernel: add support for kernel address space layout randomization (KASLR)
  s390/kernel: introduce .dma sections
  s390/sclp: do not use static sccbs
  s390/kprobes: use static buffer for insn_page
  s390/kernel: convert SYSCALL and PGM_CHECK handlers to .quad
  s390/kernel: build a relocatable kernel
  ...

diff --cc Documentation/admin-guide/kernel-parameters.txt
Simple merge

diff --cc arch/s390/Kconfig
Simple merge

diff --cc arch/s390/include/asm/syscall.h
Simple merge

diff --cc arch/s390/kernel/nospec-branch.c
Simple merge

diff --cc arch/s390/kernel/stacktrace.c
index cc9ed97870683afe706da93d692aa36748800895,89f9f63dca188f58004535cb436e5d8870799431..f6a620f854e168b733ee73f7f6eeda0910317f7d
--- 1/arch/s390/kernel/stacktrace.c
--- 2/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@@ -41,29 -16,53 +16,47 @@@
  
  void save_stack_trace(struct stack_trace *trace)
  {
-       unsigned long sp;
- 
-       sp = current_stack_pointer();
-       dump_trace(save_address, trace, NULL, sp);
+       struct unwind_state state;
+ 
+       unwind_for_each_frame(&state, current, NULL, 0) {
+               if (trace->nr_entries >= trace->max_entries)
+                       break;
+               if (trace->skip > 0)
+                       trace->skip--;
+               else
+                       trace->entries[trace->nr_entries++] = state.ip;
+       }
 -      if (trace->nr_entries < trace->max_entries)
 -              trace->entries[trace->nr_entries++] = ULONG_MAX;
  }
  EXPORT_SYMBOL_GPL(save_stack_trace);
  
  void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  {
-       unsigned long sp;
- 
-       sp = tsk->thread.ksp;
-       if (tsk == current)
-               sp = current_stack_pointer();
-       dump_trace(save_address_nosched, trace, tsk, sp);
+       struct unwind_state state;
+ 
+       unwind_for_each_frame(&state, tsk, NULL, 0) {
+               if (trace->nr_entries >= trace->max_entries)
+                       break;
+               if (in_sched_functions(state.ip))
+                       continue;
+               if (trace->skip > 0)
+                       trace->skip--;
+               else
+                       trace->entries[trace->nr_entries++] = state.ip;
+       }
 -      if (trace->nr_entries < trace->max_entries)
 -              trace->entries[trace->nr_entries++] = ULONG_MAX;
  }
  EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
  
  void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  {
-       unsigned long sp;
- 
-       sp = kernel_stack_pointer(regs);
-       dump_trace(save_address, trace, NULL, sp);
+       struct unwind_state state;
+ 
+       unwind_for_each_frame(&state, current, regs, 0) {
+               if (trace->nr_entries >= trace->max_entries)
+                       break;
+               if (trace->skip > 0)
+                       trace->skip--;
+               else
+                       trace->entries[trace->nr_entries++] = state.ip;
+       }
 -      if (trace->nr_entries < trace->max_entries)
 -              trace->entries[trace->nr_entries++] = ULONG_MAX;
  }
  EXPORT_SYMBOL_GPL(save_stack_trace_regs);

diff --cc kernel/locking/lockdep.c
Simple merge