linux-kernel - Re: [PATCH v2 1/3] ACPI: osl: Add __force attribute in acpi_os_map

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Message-ID: <YRKtEDycefrZLB3X@infradead.org>
Date:   Tue, 10 Aug 2021 17:45:04 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Veronika kabatova <vkabatov@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v2 1/3] ACPI: osl: Add __force attribute in
 acpi_os_map_iomem() cast

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.