From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751342AbaHOVcf (ORCPT ); Fri, 15 Aug 2014 17:32:35 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:41323 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750763AbaHOVce (ORCPT ); Fri, 15 Aug 2014 17:32:34 -0400 Date: Fri, 15 Aug 2014 23:32:09 +0200 From: Peter Zijlstra To: George Spelvin Cc: zhaoxiu.zeng@gmail.com, akpm@linux-foundation.org, dhowells@redhat.com, jwboyer@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, takahiro.akashi@linaro.org Subject: Re: [PATCH 1/1] GCD: add binary GCD algorithm Message-ID: <20140815213209.GM19379@twins.programming.kicks-ass.net> References: <20140815135855.GG19379@twins.programming.kicks-ass.net> <20140815201601.2497.qmail@ns.horizon.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="32ASEZPnRmW2nYUc" Content-Disposition: inline In-Reply-To: <20140815201601.2497.qmail@ns.horizon.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --32ASEZPnRmW2nYUc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, Aug 15, 2014 at 04:16:01PM -0400, George Spelvin wrote: > What I'd like is a better way to automatically configure "divide is > slow" from an architecture. So the usual thing and have arch/*/Kconfig select the fancy one if it doesn't have a hardware divide instruction. For instance: arch/arm/Kconfig: config ARM ... select GCD_FANCY_ALGO if CPU_v6 --32ASEZPnRmW2nYUc Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJT7nxUAAoJEHZH4aRLwOS6FSMP/1hNE0Gyck0w+0dRiXcIBu19 Np5msQfCwMRFVg+tOxje4rzZAUk7JuL5AYpFcqBhUAgLCK9fFyr3g6PfggdqAfI4 biDaVlO76cc0G4PRINqO29j0N27C1Ai3ciGzGSE5Kh4q582bxSY5FG+fwxFG4x1w 4izGuTVq7HvOut14A4vcwRn79RYYnnVleoUciyBbDFVzYBIaKsk+89BQYV6QaeMl Idb2TlCykySyq42WGll/+b+I1jkkoiOikWnH7O4saq3AETzI/A2/JWj2Rs4eX/U+ onztJcd8g/dbM67woj9E51PjpyWEMYLGD9n8R1IT2lZLaR9enp1BYM3SlEJUDl7x k9PISNOjMlfI42XSIozEBmMJjfCkt5JNA4fAmDF1/nf8exy3q4g801Qkmcr2x8M5 pFm0s26aZcx66lR/D24+JRfc7+kJRfflMVpBy6sJlsZVdwGf0xRZzGa0R0vLVAsI 2O6qtYWISB3b4UqvZ0QjC+vFXDjWgIZxevjm0fZFaX3a5f0PWXsd+qRPqlCLhrxl W2Z7Wi+fKEjyJTCWFh0Yb3w37im7dpdrqTaedguoTEpa2pn+D0+1RB6qbMapHKdS fzdZYKMM8SM/OKhgNCxUqBOXfQ6pM5o+4mJPsiXTVTJOvvQHWoVyPkQaSYCYVyvb 5pFhhxRY6wbwUDYCJwGw =2qHW -----END PGP SIGNATURE----- --32ASEZPnRmW2nYUc--