forked from Minki/linux
e3f4624388
It broke the 'allmodconfig' build. LD vmlinux SYSMAP System.map Building modules, stage 2. MODPOST 5028 modules ERROR: "flush_dcache_page" [net/sunrpc/xprtrdma/rpcrdma.ko] undefined! ERROR: "empty_zero_page" [net/ceph/libceph.ko] undefined! ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined! ERROR: "clear_page" [fs/ocfs2/dlm/ocfs2_dlm.ko] undefined! ERROR: "copy_page" [fs/nilfs2/nilfs2.ko] undefined! ... Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/stacktrace.h>
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void save_stack_trace(struct stack_trace *trace)
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{
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save_stack_trace_tsk(current, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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unsigned long *fpn;
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int skip = trace->skip;
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int savesched;
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if (tsk == current) {
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__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
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savesched = 1;
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} else {
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fpn = (unsigned long *)thread_saved_fp(tsk);
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savesched = 0;
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}
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while (!kstack_end(fpn) && !((unsigned long)fpn & 0x3)
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&& (fpn >= (unsigned long *)TASK_SIZE)) {
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unsigned long lpp, fpp;
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lpp = fpn[-1];
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fpp = fpn[FP_OFFSET];
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if (!__kernel_text_address(lpp))
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break;
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if (savesched || !in_sched_functions(lpp)) {
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if (skip) {
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skip--;
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} else {
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trace->entries[trace->nr_entries++] = lpp;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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}
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fpn = (unsigned long *)fpp;
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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