Make clear which path is for user tasks and for kthreads and idle tasks. This will allow easier plug-in of the ORC unwinder in the next patches.
Note that we added a check for unwind error to the top of the loop, so that an error is returned also for user tasks (the 'goto success' would skip the check after the loop otherwise). [v3] check for unwind_error in the loop Signed-off-by: Jiri Slaby <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: [email protected] Cc: Josh Poimboeuf <[email protected]> --- arch/x86/kernel/stacktrace.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index f9dacf6d4667..6acf1d5ca832 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -89,21 +89,24 @@ __save_stack_trace_reliable(struct stack_trace *trace, struct pt_regs *regs; unsigned long addr; - for (unwind_start(&state, task, NULL, NULL); !unwind_done(&state); + for (unwind_start(&state, task, NULL, NULL); + !unwind_done(&state) && !unwind_error(&state); unwind_next_frame(&state)) { regs = unwind_get_entry_regs(&state, NULL); if (regs) { + /* Success path for user tasks */ + if (user_mode(regs)) + goto success; + /* * Kernel mode registers on the stack indicate an * in-kernel interrupt or exception (e.g., preemption * or a page fault), which can make frame pointers * unreliable. */ - if (!user_mode(regs)) - return -EINVAL; - break; + return -EINVAL; } addr = unwind_get_return_address(&state); @@ -124,6 +127,11 @@ __save_stack_trace_reliable(struct stack_trace *trace, if (unwind_error(&state)) return -EINVAL; + /* Success path for non-user tasks, i.e. kthreads and idle tasks */ + if (!(task->flags & (PF_KTHREAD | PF_IDLE))) + return -EINVAL; + +success: if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; -- 2.16.3
