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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bd5df939sm45481323f8f.21.2026.01.13.11.24.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 11:24:33 -0800 (PST) Date: Tue, 13 Jan 2026 19:24:32 +0000 From: David Laight To: Mark Brown Cc: linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Alexander Viro , Andreas Dilger , Christian Brauner , Kees Cook , Miklos Szeredi , OGAWA Hirofumi , Theodore Ts'o Subject: Re: [PATCH 30/44] fs: use min() or umin() instead of min_t() Message-ID: <20260113192432.25a799f4@pumpkin> In-Reply-To: <20260113183346.18ef7c74@pumpkin> References: <20251119224140.8616-1-david.laight.linux@gmail.com> <20251119224140.8616-31-david.laight.linux@gmail.com> <62097ec5-510e-4343-b111-3afee2c7b01e@sirena.org.uk> <20260113183346.18ef7c74@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 13 Jan 2026 18:33:46 +0000 David Laight wrote: > On Tue, 13 Jan 2026 16:56:56 +0000 > Mark Brown wrote: > > > On Wed, Nov 19, 2025 at 10:41:26PM +0000, david.laight.linux@gmail.com wrote: > > > From: David Laight > > > > > > min_t(unsigned int, a, b) casts an 'unsigned long' to 'unsigned int'. > > > Use min(a, b) instead as it promotes any 'unsigned int' to 'unsigned long' > > > and so cannot discard significant bits. > > > > This breaks an arm imx_v6_v7_defconfig build: > > I hadn't tested 32bit when I sent the patch. > It was noticed ages ago and I thought there was a patch (to fuse/file.c) that > changed the code to avoid the 64bit signed maths on 32bit. I've just sent in a patch to fix it, compile tested for 32bit x86. David > > > > In file included from : > > In function 'fuse_wr_pages', > > inlined from 'fuse_perform_write' at /home/broonie/git/bisect/fs/fuse/file.c:1347:27: > > /home/broonie/git/bisect/include/linux/compiler_types.h:630:45: error: call to '__compiletime_assert_434' declared with attribute error: min(((pos + len - 1) >> 12) - (pos >> 12) + 1, max_pages) signedness error ... ^~~~~~~~~~~~~ > > /home/broonie/git/bisect/fs/fuse/file.c:1326:16: note: in expansion of macro 'min' > > 1326 | return min(((pos + len - 1) >> PAGE_SHIFT) - (pos >> PAGE_SHIFT) + 1, > > | ^~~ >