This patchset follows up on a suggestion by Markus for allowing devices to implement integer properties which don't have a default value specified in their Property struct.
My use case for this is ARM, where we have a property pmsav7-dregion whose correct default value depends on which exact ARM CPU this is. That means we can't have a single constant default value specified in the DEFINE_PROP_UINT32(), but on the other hand if we just prevent the qdev prop system from setting a default itself we can naturally get the right default value by having the structure field be correctly set to the default for the CPU in the first place. Patch 1 cleans up a corner case where we had just one Property struct which was using the default value (because it has a PropertyInfo with a non-NULL set_default_value field) but not explicitly setting .defval.[ui]. Patch 2 adds .set_default to Property, uses it as the gate on calling .set_default_value rather than just whether .set_default_value is non-NULL, and adds some macros so that devices can use the new no-default-value int props. Patch 3 uses this so M3 and M4 have the right default for the number of PMSA regions rather than getting the different R7 default. thanks -- PMM Peter Maydell (3): qdev-properties.h: Explicitly set the default value for arraylen properties qdev: support properties which don't set a default value target/arm: Make Cortex-M3 and M4 default to 8 PMSA regions include/hw/qdev-core.h | 1 + include/hw/qdev-properties.h | 21 +++++++++++++++++++++ hw/core/qdev.c | 2 +- target/arm/cpu.c | 12 +++++++++++- 4 files changed, 34 insertions(+), 2 deletions(-) -- 2.7.4