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[RFC,3/6] migration: Add VMSTATE_UNUSED_VARRAY_UINT32

Message ID 1472046153-22123-4-git-send-email-dgilbert@redhat.com
State New
Headers show

Commit Message

Dr. David Alan Gilbert Aug. 24, 2016, 1:42 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

VMSTATE_UNUSED_VARRAY_UINT32 is used to skip a chunk of the stream
that's an n-element array;  note the array size and the dynamic value
read never get multiplied so there's no overflow risk.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 include/migration/vmstate.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1638ee5..a0eff5e 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -643,6 +643,17 @@  extern const VMStateInfo vmstate_info_bitmap;
     .flags        = VMS_BUFFER,                                      \
 }
 
+/* Discard size * field_num bytes, where field_num is a uint32 member */
+#define VMSTATE_UNUSED_VARRAY_UINT32(_state, _test, _version, _field_num, _size) {\
+    .name         = "unused",                                        \
+    .field_exists = (_test),                                         \
+    .num_offset   = vmstate_offset_value(_state, _field_num, uint32_t),\
+    .version_id   = (_version),                                      \
+    .size         = (_size),                                         \
+    .info         = &vmstate_info_unused_buffer,                     \
+    .flags        = VMS_VARRAY_UINT32 | VMS_BUFFER,                  \
+}
+
 /* _field_size should be a int32_t field in the _state struct giving the
  * size of the bitmap _field in bits.
  */