Commit 9212ddb5eada64fec5a08b28207401f3cc3d0876
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4a6908a3a0
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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>
Showing 1 changed file with 11 additions and 0 deletions Side-by-side Diff
kernel/stacktrace.c
| ... | ... | @@ -6,6 +6,7 @@ |
| 6 | 6 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
| 7 | 7 | */ |
| 8 | 8 | #include <linux/sched.h> |
| 9 | +#include <linux/kernel.h> | |
| 9 | 10 | #include <linux/module.h> |
| 10 | 11 | #include <linux/kallsyms.h> |
| 11 | 12 | #include <linux/stacktrace.h> |
| ... | ... | @@ -23,4 +24,15 @@ |
| 23 | 24 | } |
| 24 | 25 | } |
| 25 | 26 | EXPORT_SYMBOL_GPL(print_stack_trace); |
| 27 | + | |
| 28 | +/* | |
| 29 | + * Architectures that do not implement save_stack_trace_tsk get this | |
| 30 | + * weak alias and a once-per-bootup warning (whenever this facility | |
| 31 | + * is utilized - for example by procfs): | |
| 32 | + */ | |
| 33 | +__weak void | |
| 34 | +save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
| 35 | +{ | |
| 36 | + WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n"); | |
| 37 | +} |
