Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752638AbXABXgB (ORCPT ); Tue, 2 Jan 2007 18:36:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752710AbXABXgB (ORCPT ); Tue, 2 Jan 2007 18:36:01 -0500 Received: from mx1.redhat.com ([66.187.233.31]:54477 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752638AbXABXgA (ORCPT ); Tue, 2 Jan 2007 18:36:00 -0500 Date: Tue, 2 Jan 2007 18:35:58 -0500 From: Dave Jones To: mingo@redhat.com Cc: Linux Kernel Subject: Shrink the held_lock struct by using bitfields. Message-ID: <20070102233558.GA4577@redhat.com> Mail-Followup-To: Dave Jones , mingo@redhat.com, Linux Kernel Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 971 Lines: 34 Shrink the held_lock struct by using bitfields. This shrinks task_struct on lockdep enabled kernels by 480 bytes. Signed-off-by: Dave Jones diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index ea097dd..ba81cce 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -175,11 +175,11 @@ struct held_lock { * The following field is used to detect when we cross into an * interrupt context: */ - int irq_context; - int trylock; - int read; - int check; - int hardirqs_off; + unsigned char irq_context:1; + unsigned char trylock:1; + unsigned char read:1; + unsigned char check:1; + unsigned char hardirqs_off:1; }; /* -- http://www.codemonkey.org.uk - 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/