From: "Robin H. Johnson" robbat2@gentoo.org
commit a90afe8d020da9298c98fddb19b7a6372e2feb45 upstream.
If the perf buffer isn't large enough, provide a hint about how large it needs to be for whatever is running.
Link: https://lkml.kernel.org/r/20210831043723.13481-1-robbat2@gentoo.org
Signed-off-by: Robin H. Johnson robbat2@gentoo.org Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com --- kernel/trace/trace_event_perf.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 083f648e3265..61e3a2620fa3 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -401,7 +401,8 @@ void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp) BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, - "perf buffer not large enough")) + "perf buffer not large enough, wanted %d, have %d", + size, PERF_MAX_TRACE_SIZE)) return NULL;
*rctxp = rctx = perf_swevent_get_recursion_context();