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bh=v9G6lJSh6OMVo7mppK0Hk+jifrbC6I47Gu6icD1n1fw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ewmaVXkxLy98D6T0jp9a151FmO0Op77gHcimtZp1SgvTUTUKuJQ5luNggprLpjZMg JZOuDeYoO+3y/I6Omc7mGGCSkjuReFAYGypqx14TBycfBylH51cJ9b2S2q0oi4rNBO xrDH/ShQcUVeiWgWolvO3OpJNpP1DHa8nrUOGvJA= Date: Wed, 23 Sep 2026 11:35:45 +0100 From: Catalin Marinas To: "Aneesh Kumar K.V (Arm)" Cc: linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, Andrew Morton , christian.koenig@amd.com, Jason Gunthorpe , Joerg Roedel , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Sumit Semwal , Suzuki K Poulose , Thomas Gleixner , Will Deacon , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH v7 06/13] dma-contiguous: Accept an explicit minimum alignment Message-ID: References: <20260921144847.501151-1-aneesh.kumar@kernel.org> <20260921144847.501151-7-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260921144847.501151-7-aneesh.kumar@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: AF3A4120005 X-Stat-Signature: qrphzbfaiumh4bh5qhj18xf4511ojcth X-HE-Tag: 1790159751-928814 X-HE-Meta: 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 nkvsfADf SVUjGTmiigPwV8vRJOsbw3XlEtA+c7v6wpW6DKyjLROOZIi5+h1sW//Cjmj4pAvHRhn9ABGN5UkBWCD86Y1FB9PlVLGawaQxNkILgxQSBqe+Bz+TFLvjeWDmPBZTB1hv8lwMaNpQTTIWTW/LFc1vwxTc6iYf0JMQ9GOJoubSa0IzVA/RQ06ff7qiIoxCI2l7yh+5+EevGhTrBSdwRx5upQTkj6O9atr19Lz4dcHpxYQncluo= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Sep 21, 2026 at 08:18:40PM +0530, Aneesh Kumar K.V (Arm) wrote: > @@ -125,7 +126,8 @@ static inline int dma_contiguous_reserve_area(phys_addr_t size, > return -ENOSYS; > } > static inline struct page *dma_alloc_from_contiguous(struct device *dev, > - size_t count, unsigned int order, bool no_warn) > + size_t count, unsigned int order, unsigned int required_order, > + bool no_warn) > { > return NULL; > } > @@ -136,7 +138,7 @@ static inline bool dma_release_from_contiguous(struct device *dev, > } > /* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */ > static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size, > - gfp_t gfp) > + gfp_t gfp, unsigned int align_order) Can we not just bake the alignment further down in these functions rather than getting the callers to pass the {required,align}_order? -- Catalin