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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:36:50 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:15 -0400 |
| commit | 30c82f6657c1ee9fbb5473924b4d3273f214bd6f (patch) | |
| tree | 8ff5705717427ea85f51d76386c3df5f65fa9bfc | |
| parent | 5b6cd5c5df4229972d8a0fd9dd9a089a1644d6ba (diff) | |
| download | qemu-30c82f6657c1ee9fbb5473924b4d3273f214bd6f.zip qemu-30c82f6657c1ee9fbb5473924b4d3273f214bd6f.tar.gz qemu-30c82f6657c1ee9fbb5473924b4d3273f214bd6f.tar.bz2 | |
hw/audio/sb16: skip automatic zero-init of large array
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>
| -rw-r--r-- | hw/audio/sb16.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/audio/sb16.c b/hw/audio/sb16.c index 19fd3b9..bac6411 100644 --- a/hw/audio/sb16.c +++ b/hw/audio/sb16.c @@ -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; |