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[2a02:3100:9c32:f801:451:cc94:d3ca:f56b]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48af507611csm1570357f8f.22.2026.09.28.23.56.05 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 28 Sep 2026 23:56:06 -0700 (PDT) From: Karl Mehltretter To: sashiko-bot@kernel.org Cc: Karl Mehltretter , Gerd Hoffmann , Vivek Kasireddy , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , Jason Gunthorpe , dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] udmabuf: respect the device's maximum segment size Date: Tue, 29 Sep 2026 08:56:01 +0200 Message-Id: <20260929065601.99518-1-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260929060028.371041F00893@smtp.kernel.org> References: <20260929054835.94118-1-kmehltretter@gmail.com> <20260929060028.371041F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Tue, Sep 29, 2026 at 06:00:27AM +0000, sashiko-bot@kernel.org wrote: > On architectures with a 256KB PAGE_SIZE (such as Hexagon or PowerPC), this > new validation evaluates to 65536 < 262144, unconditionally returning > -EINVAL and breaking all CPU mappings. Right, the misc device has no dma_parms, so it gets the 64K default and sync fails with 256K pages The misc device has no real segment limit, so for v3 I'll give it dma_parms with an unlimited max segment size and keep the -EINVAL for importers that report a limit below PAGE_SIZE. Karl