# Re: \[PATCH v2 1/3\] ACPI: osl: Add \_\_force attribute in acpi\_os\_map\_iomem() cast

- From: Christoph Hellwig \<hch@infradead.org\>
- Date: 2021-08-10 16:46:55 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/08/1473445
- Thread: https://ratatoskr.run/linux-acpi/2021/07/1457305/t.md

```text
On Mon, Aug 02, 2021 at 04:23:57PM +0100, Lorenzo Pieralisi wrote:
> Add a __force attribute to the void* cast in acpi_os_map_iomem()
> to prevent sparse warnings.

Err, no.  These annotation are there for a reason and need to
be propagated instead.  And independent of that a __force cast
without a comment explaining it is a complete no-go.

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