6a28b4c2d9
Terminating the last trace entry with ULONG_MAX is a completely pointless exercise and none of the consumers can rely on it because it's inconsistently implemented across architectures. In fact quite some of the callers remove the entry and adjust stack_trace.nr_entries afterwards. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Alexander Potapenko <glider@google.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: linux-s390@vger.kernel.org Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Link: https://lkml.kernel.org/r/20190410103644.396788431@linutronix.de
70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Stack trace management functions
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*
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* Copyright IBM Corp. 2006
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/stacktrace.h>
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#include <linux/kallsyms.h>
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#include <linux/export.h>
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static int __save_address(void *data, unsigned long address, int nosched)
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{
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struct stack_trace *trace = data;
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if (nosched && in_sched_functions(address))
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return 0;
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if (trace->skip > 0) {
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trace->skip--;
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return 0;
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}
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if (trace->nr_entries < trace->max_entries) {
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trace->entries[trace->nr_entries++] = address;
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return 0;
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}
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return 1;
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}
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static int save_address(void *data, unsigned long address, int reliable)
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{
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return __save_address(data, address, 0);
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}
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static int save_address_nosched(void *data, unsigned long address, int reliable)
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{
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return __save_address(data, address, 1);
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}
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long sp;
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sp = current_stack_pointer();
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dump_trace(save_address, trace, NULL, sp);
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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 sp;
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sp = tsk->thread.ksp;
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if (tsk == current)
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sp = current_stack_pointer();
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dump_trace(save_address_nosched, trace, tsk, sp);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
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{
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unsigned long sp;
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sp = kernel_stack_pointer(regs);
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dump_trace(save_address, trace, NULL, sp);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_regs);
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