Hai, While doing some tracing, I found a huge portion of the per-cpu buffer was taken by printk/serial output because we're disabling the trace far too late (after printing the CUT string).
Improve matters for architectures that have GENERIC_BUG + _BUG_FLAGS by killing the tracer in the exception handler before printing anything much. Signed-off-by: Peter Zijlstra (Intel) <[email protected]> --- lib/bug.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/bug.c b/lib/bug.c index 8c98af0bf585..7103440c0ee1 100644 --- a/lib/bug.c +++ b/lib/bug.c @@ -47,6 +47,7 @@ #include <linux/bug.h> #include <linux/sched.h> #include <linux/rculist.h> +#include <linux/ftrace.h> extern struct bug_entry __start___bug_table[], __stop___bug_table[]; @@ -153,6 +154,8 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) if (!bug) return BUG_TRAP_TYPE_NONE; + disable_trace_on_warning(); + file = NULL; line = 0; warning = 0;
