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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/sh/kernel/perf_callchain.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Performance event callchain support - SuperH architecture code
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  *
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  * Copyright (C) 2009  Paul Mundt
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- *
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License.  See the file "COPYING" in the main directory of this archive
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- * for more details.
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  */
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 #include <linux/kernel.h>
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 #include <linux/sched.h>
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@@ -13,11 +10,6 @@
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 #include <linux/percpu.h>
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 #include <asm/unwinder.h>
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 #include <asm/ptrace.h>
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-
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-static int callchain_stack(void *data, char *name)
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-{
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-	return 0;
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-}
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 static void callchain_address(void *data, unsigned long addr, int reliable)
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 {
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@@ -28,7 +20,6 @@
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 }
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 static const struct stacktrace_ops callchain_ops = {
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-	.stack		= callchain_stack,
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 	.address	= callchain_address,
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 };
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