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a8146f1490
commit fb033c95c94ca1ee3d16e04ebdb85d65fb55fff8 upstream. The system currently warns if the config conditions for building return_address in arch/arm/kernel/return_address.c are not met, leaving just an EXPORT_SYMBOL_GPL(return_address) of a function defined to be 'static linline'. This is a result ofaeea3592a1("ARM: 8158/1: LLVMLinux: use static inline in ARM ftrace.h"). Since we're not going to build anything other than an exported symbol for something that is already being defined to be an inline-able return of NULL, just avoid building the code to remove the following warning: Fixes:aeea3592a1("ARM: 8158/1: LLVMLinux: use static inline in ARM ftrace.h") Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/arm/kernel/return_address.c
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*
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* Copyright (C) 2009 Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
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* for Pengutronix
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*/
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#include <linux/export.h>
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#include <linux/ftrace.h>
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#include <linux/sched.h>
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#include <asm/stacktrace.h>
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struct return_address_data {
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unsigned int level;
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void *addr;
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};
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static int save_return_addr(struct stackframe *frame, void *d)
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{
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struct return_address_data *data = d;
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if (!data->level) {
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data->addr = (void *)frame->pc;
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return 1;
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} else {
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--data->level;
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return 0;
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}
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}
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void *return_address(unsigned int level)
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{
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struct return_address_data data;
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struct stackframe frame;
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data.level = level + 2;
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data.addr = NULL;
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frame.fp = (unsigned long)__builtin_frame_address(0);
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frame.sp = current_stack_pointer;
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frame.lr = (unsigned long)__builtin_return_address(0);
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frame.pc = (unsigned long)return_address;
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walk_stackframe(&frame, save_return_addr, &data);
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if (!data.level)
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return data.addr;
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else
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return NULL;
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}
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EXPORT_SYMBOL_GPL(return_address);
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