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hw/audio/via-ac97: skip automatic zero-init of large array

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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>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-14-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:51 +01:00 committed by Stefan Hajnoczi
parent 30c82f6657
commit bb71d9fe14
1 changed files with 1 additions and 1 deletions
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2
hw/audio/via-ac97.c
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@ -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;