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hw/audio/es1370: skip automatic zero-init of large array

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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 <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-10-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:47 +01:00 • committed by Stefan Hajnoczi
parent ca2cc0385d
commit 8236e20608
1 changed files with 1 additions and 1 deletions
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2
hw/audio/es1370.c
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@ -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, static void es1370_transfer_audio (ES1370State *s, struct chan *d, int loop_sel,
int max, bool *irq) int max, bool *irq)
{ {
uint8_t tmpbuf[4096]; QEMU_UNINITIALIZED uint8_t tmpbuf[4096];
size_t to_transfer; size_t to_transfer;
uint32_t addr = d->frame_addr; uint32_t addr = d->frame_addr;
int sc = d->scount & 0xffff; int sc = d->scount & 0xffff;