[PATCH v2 -next] ACPI/IORT: Fix build error implicit-function-declaration

[Hanjun Guo]

On 2022/7/26 11:35, Ren Zhijie wrote:
> If CONFIG_ACPI_IORT=y and CONFIG_IOMMU_API is not set,
> make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-,
> will be failed, like this:
> 
> drivers/acpi/arm64/iort.c: In function ‘iort_get_rmr_sids’:
> drivers/acpi/arm64/iort.c:1406:2: error: implicit declaration of function ‘iort_iommu_rmr_get_resv_regions’; did you mean ‘iort_iommu_get_resv_regions’? [-Werror=implicit-function-declaration]
>    iort_iommu_rmr_get_resv_regions(iommu_fwnode, NULL, head);
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    iort_iommu_get_resv_regions
> cc1: some warnings being treated as errors
> make[3]: *** [drivers/acpi/arm64/iort.o] Error 1
> 
> The function iort_iommu_rmr_get_resv_regions()
> is declared under CONFIG_IOMMU_API,
> and the callers of iort_get_rmr_sids() and iort_put_rmr_sids()
> would select IOMMU_API.
> 
> To fix this error, move the definitions to #ifdef CONFIG_IOMMU_API.
> 
> Fixes: e302eea8f497 ("ACPI/IORT: Add a helper to retrieve RMR info directly")
> Signed-off-by: Ren Zhijie <renzhijie2 at huawei.com>
> ---
> Changes in v2:
>   - change commit message to a max of 75 chars per line.
> 

Acked-by: Hanjun Guo <guohanjun at huawei.com>

Lorenzo, will this patch go via ARM64 tree?

Thanks
Hanjun