add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/oprofile/init.c
..
..
@@ -13,23 +13,17 @@
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 #include <linux/oprofile.h>
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 #include <linux/init.h>
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 #include <asm/processor.h>
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-
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-static int __s390_backtrace(void *data, unsigned long address, int reliable)
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-{
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-	unsigned int *depth = data;
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-
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-	if (*depth == 0)
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-		return 1;
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-	(*depth)--;
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-	oprofile_add_trace(address);
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-	return 0;
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-}
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+#include <asm/unwind.h>
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 static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
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 {
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-	if (user_mode(regs))
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-		return;
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-	dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
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+	struct unwind_state state;
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+
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+	unwind_for_each_frame(&state, current, regs, 0) {
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+		if (depth-- == 0)
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+			break;
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+		oprofile_add_trace(state.ip);
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+	}
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 }
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 int __init oprofile_arch_init(struct oprofile_operations *ops)