[PATCH 15/31] hw/dma/xlnx_csu_dma: skip automatic zero-init of large array

[Daniel P . Berrangé]

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

The 'buf' array will be fully initialized when data is copied.

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

diff --git a/hw/dma/xlnx_csu_dma.c b/hw/dma/xlnx_csu_dma.c
index 3db3904d83..d8c7da1a50 100644
--- a/hw/dma/xlnx_csu_dma.c
+++ b/hw/dma/xlnx_csu_dma.c
@@ -287,7 +287,7 @@ static uint32_t xlnx_csu_dma_advance(XlnxCSUDMA *s, 
uint32_t len)
 static void xlnx_csu_dma_src_notify(void *opaque)
 {
     XlnxCSUDMA *s = XLNX_CSU_DMA(opaque);
-    unsigned char buf[4 * 1024];
+    QEMU_UNINITIALIZED unsigned char buf[4 * 1024];
     size_t rlen = 0;
 
     ptimer_transaction_begin(s->src_timer);
-- 
2.49.0