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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:36:48 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:39:08 -0400 |
| commit | 2e438da4929018c62609381e1156aac0b2fe3de3 (patch) | |
| tree | c97bdf582b9e5ea7a869fe99f748dc75f218a661 | |
| parent | 8236e206084b832d1d7ec947a4798b818f4cdf1f (diff) | |
| download | qemu-2e438da4929018c62609381e1156aac0b2fe3de3.zip qemu-2e438da4929018c62609381e1156aac0b2fe3de3.tar.gz qemu-2e438da4929018c62609381e1156aac0b2fe3de3.tar.bz2 | |
hw/audio/gus: skip automatic zero-init of large array
The 'GUS_read_DMA' 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: 20250610123709.835102-11-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | hw/audio/gus.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/audio/gus.c b/hw/audio/gus.c index 87e8634..c36df02 100644 --- a/hw/audio/gus.c +++ b/hw/audio/gus.c @@ -183,7 +183,7 @@ static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len) { GUSState *s = opaque; IsaDmaClass *k = ISADMA_GET_CLASS(s->isa_dma); - char tmpbuf[4096]; + QEMU_UNINITIALIZED char tmpbuf[4096]; int pos = dma_pos, mode, left = dma_len - dma_pos; ldebug ("read DMA %#x %d\n", dma_pos, dma_len); |