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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-10 19:58:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-10 19:58:10 -0700 |
| commit | 991ec02cdca33b03a132a0cacfe6f0aa0be9aa8d (patch) | |
| tree | 50b5f4e2b9f138da57f76eca44fdcc80a2fcd428 /kernel/trace/trace_functions_graph.c | |
| parent | 862366118026a358882eefc70238dbcc3db37aac (diff) | |
| parent | 84047e360af0394ac5861d433f26bbcf30f77dd1 (diff) | |
| download | kernel_samsung_smdk4412-991ec02cdca33b03a132a0cacfe6f0aa0be9aa8d.zip kernel_samsung_smdk4412-991ec02cdca33b03a132a0cacfe6f0aa0be9aa8d.tar.gz kernel_samsung_smdk4412-991ec02cdca33b03a132a0cacfe6f0aa0be9aa8d.tar.bz2 | |
Merge branch 'tracing-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'tracing-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
function-graph: always initialize task ret_stack
function-graph: move initialization of new tasks up in fork
function-graph: add memory barriers for accessing task's ret_stack
function-graph: enable the stack after initialization of other variables
function-graph: only allocate init tasks if it was not already done
Manually fix trivial conflict in kernel/trace/ftrace.c
Diffstat (limited to 'kernel/trace/trace_functions_graph.c')
| -rw-r--r-- | kernel/trace/trace_functions_graph.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index 10f6ad7..8b59241 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -65,6 +65,12 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth) if (!current->ret_stack) return -EBUSY; + /* + * We must make sure the ret_stack is tested before we read + * anything else. + */ + smp_rmb(); + /* The return trace stack is full */ if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) { atomic_inc(¤t->trace_overrun); |