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stacktrace: provide save_stack_trace_tsk() weak alias
Impact: build fix Some architectures have not implemented save_stack_trace_tsk() yet: fs/built-in.o: In function `proc_pid_stack': base.c:(.text+0x3f140): undefined reference to `save_stack_trace_tsk' So warn about that if the facility is used. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -6,6 +6,7 @@
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* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/stacktrace.h>
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@ -24,3 +25,13 @@ void print_stack_trace(struct stack_trace *trace, int spaces)
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}
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EXPORT_SYMBOL_GPL(print_stack_trace);
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/*
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* Architectures that do not implement save_stack_trace_tsk get this
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* weak alias and a once-per-bootup warning (whenever this facility
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* is utilized - for example by procfs):
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*/
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__weak void
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save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
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}
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