[PATCH] perf/aux: Only update aux_wakeup in non-overwrite mode

[Alexander Shishkin]

Commit d9a50b0256 ("perf/aux: Ensure aux_wakeup represents most recent
wakeup index") changed aux wakeup position calculation to rounddown(),
which causes a division-by-zero in AUX overwrite mode (aka "snapshot
mode").

The zero denominator results from the fact that perf record doesn't set
aux_watermark to anything, in which case the kernel will set it to half
the AUX buffer size, but only for non-overwrite mode. In the overwrite
mode aux_watermark stays zero.

The good news is that, AUX overwrite mode, wakeups don't happen and
related bookkeeping is not relevant, so we can simply forego the whole
wakeup updates.

Signed-off-by: Alexander Shishkin <alexander.shish...@linux.intel.com>
---
 kernel/events/ring_buffer.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index f4ebe42879..4dae1da4c1 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -412,6 +412,19 @@ void *perf_aux_output_begin(struct perf_output_handle 
*handle,
        return NULL;
 }
 
+static bool __always_inline rb_need_aux_wakeup(struct ring_buffer *rb)
+{
+       if (rb->aux_overwrite)
+               return false;
+
+       if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) {
+               rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark);
+               return true;
+       }
+
+       return false;
+}
+
 /*
  * Commit the data written by hardware into the ring buffer by adjusting
  * aux_head and posting a PERF_RECORD_AUX into the perf buffer. It is the
@@ -451,10 +464,8 @@ void perf_aux_output_end(struct perf_output_handle 
*handle, unsigned long size)
        }
 
        rb->user_page->aux_head = rb->aux_head;
-       if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) {
+       if (rb_need_aux_wakeup(rb))
                wakeup = true;
-               rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark);
-       }
 
        if (wakeup) {
                if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED)
@@ -484,9 +495,8 @@ int perf_aux_output_skip(struct perf_output_handle *handle, 
unsigned long size)
        rb->aux_head += size;
 
        rb->user_page->aux_head = rb->aux_head;
-       if (rb->aux_head - rb->aux_wakeup >= rb->aux_watermark) {
+       if (rb_need_aux_wakeup(rb)) {
                perf_output_wakeup(handle);
-               rb->aux_wakeup = rounddown(rb->aux_head, rb->aux_watermark);
                handle->wakeup = rb->aux_wakeup + rb->aux_watermark;
        }
 
-- 
2.14.1