Re: [PATCH v3 1/3] spapr: nvdimm: Forward declare and move the definitions

David Gibson <[email protected]> Wed, 24 Mar 2021 13:30:55 +1100
Newsgroups	org.01.lists.linux-nvdimm,dev.linux.lists.nvdimm,org.kernel.vger.kvm-ppc,org.nongnu.qemu-devel
Message-ID	<[email protected]>
On Tue, Mar 23, 2021 at 09:47:23AM -0400, Shivaprasad G Bhat wrote:
> The subsequent patches add definitions which tend to
> get the compilation to cyclic dependency. So, prepare
> with forward declarations, move the defitions and clean up.
> 
> Signed-off-by: Shivaprasad G Bhat <[email protected]>
> ---
>  hw/ppc/spapr_nvdimm.c         |   12 ++++++++++++
>  include/hw/ppc/spapr_nvdimm.h |   21 ++++++---------------
>  2 files changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c
> index b46c36917c..8cf3fb2ffb 100644
> --- a/hw/ppc/spapr_nvdimm.c
> +++ b/hw/ppc/spapr_nvdimm.c
> @@ -31,6 +31,18 @@
>  #include "qemu/range.h"
>  #include "hw/ppc/spapr_numa.h"
>  
> +/*
> + * The nvdimm size should be aligned to SCM block size.
> + * The SCM block size should be aligned to SPAPR_MEMORY_BLOCK_SIZE
> + * inorder to have SCM regions not to overlap with dimm memory regions.
> + * The SCM devices can have variable block sizes. For now, fixing the
> + * block size to the minimum value.
> + */
> +#define SPAPR_MINIMUM_SCM_BLOCK_SIZE SPAPR_MEMORY_BLOCK_SIZE
> +
> +/* Have an explicit check for alignment */
> +QEMU_BUILD_BUG_ON(SPAPR_MINIMUM_SCM_BLOCK_SIZE % SPAPR_MEMORY_BLOCK_SIZE);
> +
>  bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
>                             uint64_t size, Error **errp)
>  {
> diff --git a/include/hw/ppc/spapr_nvdimm.h b/include/hw/ppc/spapr_nvdimm.h
> index 73be250e2a..abcacda5d7 100644
> --- a/include/hw/ppc/spapr_nvdimm.h
> +++ b/include/hw/ppc/spapr_nvdimm.h
> @@ -11,23 +11,14 @@
>  #define HW_SPAPR_NVDIMM_H
>  
>  #include "hw/mem/nvdimm.h"
> -#include "hw/ppc/spapr.h"
>  
> -/*
> - * The nvdimm size should be aligned to SCM block size.
> - * The SCM block size should be aligned to SPAPR_MEMORY_BLOCK_SIZE
> - * inorder to have SCM regions not to overlap with dimm memory regions.
> - * The SCM devices can have variable block sizes. For now, fixing the
> - * block size to the minimum value.
> - */
> -#define SPAPR_MINIMUM_SCM_BLOCK_SIZE SPAPR_MEMORY_BLOCK_SIZE
> -
> -/* Have an explicit check for alignment */
> -QEMU_BUILD_BUG_ON(SPAPR_MINIMUM_SCM_BLOCK_SIZE % SPAPR_MEMORY_BLOCK_SIZE);
> +struct SpaprDrc;
> +struct SpaprMachineState;
>  
> -int spapr_pmem_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
> -                           void *fdt, int *fdt_start_offset, Error **errp);
> -void spapr_dt_persistent_memory(SpaprMachineState *spapr, void *fdt);
> +int spapr_pmem_dt_populate(struct SpaprDrc *drc,

Using explicit struct tags is against qemu coding style.   You should
put a typedef on the forward decl so you don't need to do it here (see
examples in spapr_pci.c amongst other places).

> +                           struct SpaprMachineState *spapr, void *fdt,
> +                           int *fdt_start_offset, Error **errp);
> +void spapr_dt_persistent_memory(struct SpaprMachineState *spapr, void *fdt);
>  bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
>                             uint64_t size, Error **errp);
>  void spapr_add_nvdimm(DeviceState *dev, uint64_t slot);
> 
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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