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authorIngo Molnar <mingo@elte.hu>2008-12-25 11:21:20 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-25 11:44:43 +0100
commit9212ddb5eada64fec5a08b28207401f3cc3d0876 (patch)
tree3b1a6040813d623d5d2d077bffd0dea5fb36f693
parent4a6908a3a050aacc9c3a2f36b276b46c0629ad91 (diff)
downloadlinux-sh-9212ddb5eada64fec5a08b28207401f3cc3d0876.tar.gz
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>
-rw-r--r--kernel/stacktrace.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index 94b527ef1d1e..eb212f8f8bc8 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -6,6 +6,7 @@
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/sched.h>
+#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
@@ -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");
+}