From 9212ddb5eada64fec5a08b28207401f3cc3d0876 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Thu, 25 Dec 2008 11:21:20 +0100 Subject: [PATCH] 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 --- kernel/stacktrace.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c index 94b527ef1d1..eb212f8f8bc 100644 --- a/kernel/stacktrace.c +++ b/kernel/stacktrace.c @@ -6,6 +6,7 @@ * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar */ #include +#include #include #include #include @@ -24,3 +25,13 @@ void print_stack_trace(struct stack_trace *trace, int spaces) } EXPORT_SYMBOL_GPL(print_stack_trace); +/* + * Architectures that do not implement save_stack_trace_tsk get this + * weak alias and a once-per-bootup warning (whenever this facility + * is utilized - for example by procfs): + */ +__weak void +save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n"); +}