Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754508AbXJXIGJ (ORCPT ); Wed, 24 Oct 2007 04:06:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750911AbXJXIFy (ORCPT ); Wed, 24 Oct 2007 04:05:54 -0400 Received: from brick.kernel.dk ([87.55.233.238]:20807 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750893AbXJXIFw (ORCPT ); Wed, 24 Oct 2007 04:05:52 -0400 Date: Wed, 24 Oct 2007 10:05:50 +0200 From: Jens Axboe To: Linus Torvalds Cc: Boaz Harrosh , Alan Cox , Geert Uytterhoeven , Linux Kernel Development , mingo@elte.hu, Linux/m68k Subject: Re: [PATCH 09/10] Change table chaining layout Message-ID: <20071024080549.GZ14671@kernel.dk> References: <20071022211617.31f5c63d@the-village.bc.nu> <20071022224343.4abf3c96@the-village.bc.nu> <471DBEF4.4030303@panasas.com> <20071023094142.GD5059@kernel.dk> <471DC3D9.2070809@panasas.com> <20071023095507.GE5059@kernel.dk> <471DCBB2.9020706@panasas.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1464 Lines: 39 On Tue, Oct 23 2007, Linus Torvalds wrote: > My biggest complaint right now is that a lot of users of the sg *filling* > functions were mindlessly converted, so we have code like > > cryptoloop.c: sg_set_page(&sg_in, in_page); > cryptoloop.c: sg_in.offset = in_offs; > cryptoloop.c: sg_in.length = sz; > > which is just really stupid, and we should have a function for that. But > worse is code like this: > > ub.c: sg_set_page(sg, virt_to_page(sc->top_sense)); > ub.c: sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1); > ub.c: sg->length = UB_SENSE_SIZE; > > which again was converted "line by line" and we actually *do* have a > function to do the above three lines as > > sg_set_buf(sg, sc->top_sense, UB_SENSE_SIZE); > > where that *single* line is just tons shorter but more importantly, more > readable, than the mess that is a brute-force conversion. I modified sg_set_page() to take a length and offset argument, and converted these silly sg_set_page(.., virt_to_page(foo)) to just use sg_set_buf() instead: 30 files changed, 93 insertions(+), 152 deletions(-) and it's definitely a win. Added to the pending bits... -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/