From 8236e206084b832d1d7ec947a4798b818f4cdf1f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Daniel=20P=2E=20Berrang=C3=A9?= Date: Tue, 10 Jun 2025 13:36:47 +0100 Subject: [PATCH] hw/audio/es1370: skip automatic zero-init of large array MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The 'es1370_transfer_audio' 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 the audio backend and/or device memory. Signed-off-by: Daniel P. Berrangé Reviewed-by: Stefan Hajnoczi Message-id: 20250610123709.835102-10-berrange@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/audio/es1370.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/audio/es1370.c b/hw/audio/es1370.c index 8efb969212..a6a32a6348 100644 --- a/hw/audio/es1370.c +++ b/hw/audio/es1370.c @@ -604,7 +604,7 @@ static uint64_t es1370_read(void *opaque, hwaddr addr, unsigned size) static void es1370_transfer_audio (ES1370State *s, struct chan *d, int loop_sel, int max, bool *irq) { - uint8_t tmpbuf[4096]; + QEMU_UNINITIALIZED uint8_t tmpbuf[4096]; size_t to_transfer; uint32_t addr = d->frame_addr; int sc = d->scount & 0xffff; -- 2.39.5