[PATCH 13/31] hw/audio/via-ac97: skip automatic zero-init of large array

[Daniel P . Berrangé]

The 'out_cb' method has a 4k byte array used for copying data
between the audio backend and device. Skip the automatic zero-init
of this array to eliminate the performance overhead in the I/O hot
path.

The 'tmpbuf' array will be fully initialized when reading data from
device memory.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 hw/audio/via-ac97.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/audio/via-ac97.c b/hw/audio/via-ac97.c
index 1e0a5c7398..d5231e1cf2 100644
--- a/hw/audio/via-ac97.c
+++ b/hw/audio/via-ac97.c
@@ -175,7 +175,7 @@ static void out_cb(void *opaque, int avail)
     ViaAC97SGDChannel *c = &s->aur;
     int temp, to_copy, copied;
     bool stop = false;
-    uint8_t tmpbuf[4096];
+    QEMU_UNINITIALIZED uint8_t tmpbuf[4096];
 
     if (c->stat & STAT_PAUSED) {
         return;
-- 
2.49.0