ARM/clkdev fixes for v6.10

- Fix clkdev - erroring out on long strings causes boot failures, so
   don't do this. Still warn about the over-sized strings (which will
   never match and thus their registration with clkdev is useless.)
 
 - Fix for ftrace with frame pointer unwinder with recent GCC changing
   the way frames are stacked.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux

Pull ARM and clkdev fixes from Russell King:

 - Fix clkdev - erroring out on long strings causes boot failures, so
   don't do this. Still warn about the over-sized strings (which will
   never match and thus their registration with clkdev is useless)

 - Fix for ftrace with frame pointer unwinder with recent GCC changing
   the way frames are stacked.

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux:
  ARM: 9405/1: ftrace: Don't assume stack frames are contiguous in memory
  clkdev: don't fail clkdev_alloc() if over-sized

arch/arm/kernel/ftrace.c

@@ -232,11 +232,24 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
 	unsigned long old;
 
 	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+err_out:
 		return;
 
 	if (IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER)) {
-		/* FP points one word below parent's top of stack */
-		frame_pointer += 4;
+		/*
+		 * Usually, the stack frames are contiguous in memory but cases
+		 * have been observed where the next stack frame does not live
+		 * at 'frame_pointer + 4' as this code used to assume.
+		 *
+		 * Instead, dereference the field in the stack frame that
+		 * stores the SP of the calling frame: to avoid unbounded
+		 * recursion, this cannot involve any ftrace instrumented
+		 * functions, so use the __get_kernel_nofault() primitive
+		 * directly.
+		 */
+		__get_kernel_nofault(&frame_pointer,
+				     (unsigned long *)(frame_pointer - 8),
+				     unsigned long, err_out);
 	} else {
 		struct stackframe frame = {
 			.fp = frame_pointer,

drivers/clk/clkdev.c

@@ -204,8 +204,15 @@ fail:
 	pr_err("%pV:%s: %s ID is greater than %zu\n",
 	       &vaf, con_id, failure, max_size);
 	va_end(ap_copy);
-	kfree(cla);
-	return NULL;
+
+	/*
+	 * Don't fail in this case, but as the entry won't ever match just
+	 * fill it with something that also won't match.
+	 */
+	strscpy(cla->con_id, "bad", sizeof(cla->con_id));
+	strscpy(cla->dev_id, "bad", sizeof(cla->dev_id));
+
+	return &cla->cl;
 }
 
 static struct clk_lookup *