From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ms.lwn.net (ms.lwn.net [45.79.88.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57AE3260578 for ; Thu, 24 Jul 2025 18:53:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.79.88.28 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753383183; cv=none; b=Jr/b2n1dOnYGpEMoQ5tziE7/+F1KH9Lr8cL8PkIFdMWQlUetJRkC/VC4N4pUKuFmJSUzXwkKgCYvdf0n+XEOBI8hwDCZ8bVZQkgTCZW+WAES1RlWHZGxpJaraFrfwPfk4juDgPOxxdCxGRpzEFkppluSEGve8NrzQ52iOP5EITA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753383183; c=relaxed/simple; bh=7HcvjCCgvYT0Xx9xvilMRJ8H5x4WbjELKlsLdq7oVJc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=dejjeC+9/WKgsYM1fDr8RFmvs5LQBIF1yvtNw0MlJPoS6MPZAtET9xvrLeGE4jWIfpd6vbaPtEKMWjF46XGaTYW15dMGbHzyLhzcaXClD9F7JmivzJT9W4l/qAnHZjfVNKy6clPOWy70/su2XxMITLibo0+EVCGf3UbR4zd1fSk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net; spf=pass smtp.mailfrom=lwn.net; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b=G4npzWaC; arc=none smtp.client-ip=45.79.88.28 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lwn.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b="G4npzWaC" DKIM-Filter: OpenDKIM Filter v2.11.0 ms.lwn.net 3EF3440AA9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lwn.net; s=20201203; t=1753383181; bh=u0Xf0b8DinK01imbKK6i64vZs39pYDGJTQ5VYvwvFoc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=G4npzWaCRHx/kHnsrMIeGN5Ihq3TLvct0YEtFNcm0vllmisIQvSuDqpIJsBg9Snxs DwkzjBwBhwcoHED4WgxCJab3d/+3Q0N7M/ZSIQ7Q0DCBtPYlGiicJYpEekhU9v8N7T 1kIbJDCapnNj6g61YNDaqn1bE4cpIiAbCpZ651+ZseHG/gpNhobMHxbWWKopdM2oVI TrCzMFN0VAQmWCL6Qjpm1xJr7AcWtwokqkggYQhuTa8aOIPKctK/qNr0EJquNO9fbp z22+COmDXDHFilHiBn/1MosmHguYzXr/9mQlf2+z8//depVNZIOn8CaYdQThHNkeL/ q4n2bsrri1Jow== Received: from localhost (unknown [IPv6:2601:280:4600:2da9::1fe]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id 3EF3440AA9; Thu, 24 Jul 2025 18:53:01 +0000 (UTC) From: Jonathan Corbet To: Lorenzo Stoakes , Andrew Morton Cc: Christoph Hellwig , David Hildenbrand , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] mm: remove io-mapping In-Reply-To: <20250724145313.65920-1-lorenzo.stoakes@oracle.com> References: <20250724145313.65920-1-lorenzo.stoakes@oracle.com> Date: Thu, 24 Jul 2025 12:53:00 -0600 Message-ID: <87y0sd8lpv.fsf@trenco.lwn.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Lorenzo Stoakes writes: > This is dead code, which was used from commit b739f125e4eb ("i915: use > io_mapping_map_user") but reverted a month later by commit > 0e4fe0c9f2f9 ("Revert "i915: use io_mapping_map_user"") back in 2021. > > Since then nobody has used it, so remove it. > > Signed-off-by: Lorenzo Stoakes > --- > include/linux/io-mapping.h | 231 ------------------------------------- > mm/Kconfig | 4 - > mm/Makefile | 1 - > mm/io-mapping.c | 30 ----- > 4 files changed, 266 deletions(-) > delete mode 100644 include/linux/io-mapping.h > delete mode 100644 mm/io-mapping.c [...] > -/* > - * The io_mapping mechanism provides an abstraction for mapping > - * individual pages from an io device to the CPU in an efficient fashion. > - * > - * See Documentation/driver-api/io-mapping.rst > - */ ^ | You'll want to get rid of that file --+ too jon