Merge tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Lots of new features and fixes:

   - Added TOC (table of content) support, which is a debugging feature
     which is either initiated by pressing the TOC button or via command
     in the BMC. If pressed the Linux built-in KDB/KGDB will be called
     (Sven Schnelle)

   - Fix CONFIG_PREEMPT (Sven)

   - Fix unwinder on 64-bit kernels (Sven)

   - Various kgdb fixes (Sven)

   - Added KFENCE support (me)

   - Switch to ARCH_STACKWALK implementation (me)

   - Fix ptrace check on syscall return (me)

   - Fix kernel crash with fixmaps on PA1.x machines (me)

   - Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK
     (me)

   - Updated defconfigs

   - Smaller cleanups, including Makefile cleanups (Masahiro Yamada),
     use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao
     Han)"

* tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (36 commits)
  parisc: Fix set_fixmap() on PA1.x CPUs
  parisc: Use swap() to swap values in setup_bootmem()
  parisc: Update defconfigs
  parisc: decompressor: clean up Makefile
  parisc: decompressor: remove repeated depenency of misc.o
  parisc: Remove unused constants from asm-offsets.c
  parisc/ftrace: use static key to enable/disable function graph tracer
  parisc/ftrace: set function trace function
  parisc: Make use of the helper macro kthread_run()
  parisc: mark xchg functions notrace
  parisc: enhance warning regarding usage of O_NONBLOCK
  parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers
  parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h
  parisc: Use PRIV_USER in syscall.S
  parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling
  parisc: Move thread_info into task struct
  parisc: add support for TOC (transfer of control)
  parisc/firmware: add functions to retrieve TOC data
  parisc: add PIM TOC data structures
  parisc: move virt_map macro to assembly.h
  ...

1 files changed, 13 insertions, 17 deletions

diff --git a/arch/parisc/kernel/stacktrace.c b/arch/parisc/kernel/stacktrace.c
index 34bf6d6bf6e8..6b4ca91932cf 100644
--- a/arch/parisc/kernel/stacktrace.c
+++ b/arch/parisc/kernel/stacktrace.c
@@ -2,45 +2,41 @@
 /*
  * Stack trace management functions
  *
- *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
+ *  Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>
  *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
  *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
  *
  *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
  */
-#include <linux/module.h>
 #include <linux/stacktrace.h>
 
 #include <asm/unwind.h>
 
-static void dump_trace(struct task_struct *task, struct stack_trace *trace)
+static void notrace walk_stackframe(struct task_struct *task,
+	struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
 {
 	struct unwind_frame_info info;
 
 	unwind_frame_init_task(&info, task, NULL);
-
-	/* unwind stack and save entries in stack_trace struct */
-	trace->nr_entries = 0;
-	while (trace->nr_entries < trace->max_entries) {
+	while (1) {
 		if (unwind_once(&info) < 0 || info.ip == 0)
 			break;
 
 		if (__kernel_text_address(info.ip))
-			trace->entries[trace->nr_entries++] = info.ip;
+			if (!fn(cookie, info.ip))
+				break;
 	}
 }
 
-/*
- * Save stack-backtrace addresses into a stack_trace buffer.
- */
-void save_stack_trace(struct stack_trace *trace)
+void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
+		     struct task_struct *task, struct pt_regs *regs)
 {
-	dump_trace(current, trace);
+	walk_stackframe(task, regs, consume_entry, cookie);
 }
-EXPORT_SYMBOL_GPL(save_stack_trace);
 
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
+			     struct task_struct *task)
 {
-	dump_trace(tsk, trace);
+	walk_stackframe(task, NULL, consume_entry, cookie);
+	return 1;
 }
-EXPORT_SYMBOL_GPL(save_stack_trace_tsk);