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hw/audio/sb16: skip automatic zero-init of large array

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The 'write_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
device memory.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-13-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:50 +01:00 • committed by Stefan Hajnoczi
parent 5b6cd5c5df
commit 30c82f6657
1 changed files with 1 additions and 1 deletions
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2
hw/audio/sb16.c
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@ -1181,7 +1181,7 @@ static int write_audio (SB16State *s, int nchan, int dma_pos,
IsaDma *isa_dma = nchan == s->dma ? s->isa_dma : s->isa_hdma;
IsaDmaClass *k = ISADMA_GET_CLASS(isa_dma);
int temp, net;
uint8_t tmpbuf[4096];
QEMU_UNINITIALIZED uint8_t tmpbuf[4096];
temp = len;
net = 0;