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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/s390/kernel/mcount.S
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@@ -20,6 +20,7 @@
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 ENTRY(ftrace_stub)
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 	BR_EX	%r14
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+ENDPROC(ftrace_stub)
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 #define STACK_FRAME_SIZE  (STACK_FRAME_OVERHEAD + __PT_SIZE)
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 #define STACK_PTREGS	  (STACK_FRAME_OVERHEAD)
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@@ -34,13 +35,16 @@
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 ENTRY(_mcount)
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 	BR_EX	%r14
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-
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+ENDPROC(_mcount)
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 EXPORT_SYMBOL(_mcount)
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 ENTRY(ftrace_caller)
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 	.globl	ftrace_regs_caller
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 	.set	ftrace_regs_caller,ftrace_caller
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 	stg	%r14,(__SF_GPRS+8*8)(%r15)	# save traced function caller
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+	lghi	%r14,0				# save condition code
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+	ipm	%r14				# don't put any instructions
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+	sllg	%r14,%r14,16			# clobbering CC before this point
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 	lgr	%r1,%r15
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 #if !(defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT))
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 	aghi	%r0,MCOUNT_RETURN_FIXUP
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@@ -53,6 +57,9 @@
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 	# allocate pt_regs and stack frame for ftrace_trace_function
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 	aghi	%r15,-STACK_FRAME_SIZE
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 	stg	%r1,(STACK_PTREGS_GPRS+15*8)(%r15)
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+	stg	%r14,(STACK_PTREGS_PSW)(%r15)
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+	lg	%r14,(__SF_GPRS+8*8)(%r1)	# restore original return address
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+	stosm	(STACK_PTREGS_PSW)(%r15),0
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 	aghi	%r1,-TRACED_FUNC_FRAME_SIZE
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 	stg	%r1,__SF_BACKCHAIN(%r15)
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 	stg	%r0,(STACK_PTREGS_PSW+8)(%r15)
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@@ -75,10 +82,11 @@
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 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
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 # The j instruction gets runtime patched to a nop instruction.
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 # See ftrace_enable_ftrace_graph_caller.
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-ENTRY(ftrace_graph_caller)
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+	.globl ftrace_graph_caller
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+ftrace_graph_caller:
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 	j	ftrace_graph_caller_end
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-	lg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
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-	lg	%r3,(STACK_PTREGS_PSW+8)(%r15)
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+	lmg	%r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
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+	lg	%r4,(STACK_PTREGS_PSW+8)(%r15)
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 	brasl	%r14,prepare_ftrace_return
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 	stg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
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 ftrace_graph_caller_end:
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@@ -87,6 +95,7 @@
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 	lg	%r1,(STACK_PTREGS_PSW+8)(%r15)
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 	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
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 	BR_EX	%r1
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+ENDPROC(ftrace_caller)
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 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
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@@ -100,5 +109,6 @@
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 	lgr	%r14,%r2
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 	lmg	%r2,%r5,32(%r15)
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 	BR_EX	%r14
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+ENDPROC(return_to_handler)
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 #endif