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Date: Tue, 13 Oct 2026 09:06:26 -0600
From: Keith Busch <kbusch@kernel.org>
To: Keith Busch <kbusch@meta.com>
Cc: dinguyen@kernel.org, schuster.simon@siemens-energy.com,
	linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
	lftan@altera.com, kernel test robot <lkp@intel.com>
Subject: Re: [PATCH] nios2: fix __wsum type degradation in csum_fold()
Message-ID: <as5I8gmaWXr5OUgb@kbusch-mbp>
References: <20260922153416.730513-1-kbusch@meta.com>
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In-Reply-To: <20260922153416.730513-1-kbusch@meta.com>

On Tue, Sep 22, 2026 at 08:34:16AM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch@kernel.org>
> 
> csum_fold() shifts a bitwise __wsum type, which sparse reports as
> "restricted __wsum degrades to integer". Sparse only checks the body of
> a static inline once something instantiates it, so this went unnoticed
> until a recent block layer change added the first csum_fold() caller to
> a file built on this architecture.
> 
> Force cast to a __u32 for the shift, as the other architectures do.

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