From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95488C32753 for ; Wed, 14 Aug 2019 17:26:34 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6DE1D20665 for ; Wed, 14 Aug 2019 17:26:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6DE1D20665 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34536 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hxx2f-0006Xm-N3 for qemu-devel@archiver.kernel.org; Wed, 14 Aug 2019 13:26:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34229) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hxx24-00067e-NC for qemu-devel@nongnu.org; Wed, 14 Aug 2019 13:25:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hxx23-0004N0-Cq for qemu-devel@nongnu.org; Wed, 14 Aug 2019 13:25:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55300) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hxx23-0004Lj-7B for qemu-devel@nongnu.org; Wed, 14 Aug 2019 13:25:55 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 89724309BDA0; Wed, 14 Aug 2019 17:25:54 +0000 (UTC) Received: from work-vm (ovpn-117-212.ams2.redhat.com [10.36.117.212]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DB2DC909F8; Wed, 14 Aug 2019 17:25:48 +0000 (UTC) Date: Wed, 14 Aug 2019 18:25:45 +0100 From: "Dr. David Alan Gilbert" To: Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= Message-ID: <20190814172545.GS2920@work-vm> References: <20190813102936.32195-1-dgilbert@redhat.com> <20190813102936.32195-2-dgilbert@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Wed, 14 Aug 2019 17:25:54 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 1/2] memory: Align and add helper for comparing MemoryRegionSections X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, pbonzini@redhat.com, qemu-devel@nongnu.org, mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Philippe Mathieu-Daud=E9 (philmd@redhat.com) wrote: > Hi David, >=20 > On 8/13/19 12:29 PM, Dr. David Alan Gilbert (git) wrote: > > From: "Dr. David Alan Gilbert" > >=20 > > MemoryRegionSection includes an Int128 'size' field; > > on some platforms the compiler causes an alignment of this to > > a 128bit boundary, leaving 8 bytes of dead space. > > This deadspace can be filled with junk. > >=20 > > Move the size field to the top avoiding unnecsssary alignment >=20 > "unnecessary" Oops thanks. > This is enough change to be in its own commit. >=20 > --- >=20 > > and provide an 'eq' routine to safely compare MRS's. >=20 > This is another change, and should be squashed in the next patch IMO. OK, what I'll do is I'll split this one into two ; I feel better having the extra function here separate from the next commit. > Doesn't Clang warn about unused 'static inline' btw? I was using gcc; but we seem to have loads of static inline's - what would make this one different? Dave > >=20 > > Signed-off-by: Dr. David Alan Gilbert > > --- > > include/exec/memory.h | 14 +++++++++++++- > > 1 file changed, 13 insertions(+), 1 deletion(-) > >=20 > > diff --git a/include/exec/memory.h b/include/exec/memory.h > > index 606250172a..ce62e847bd 100644 > > --- a/include/exec/memory.h > > +++ b/include/exec/memory.h > > @@ -487,15 +487,27 @@ static inline FlatView *address_space_to_flatvi= ew(AddressSpace *as) > > * @nonvolatile: this section is non-volatile > > */ > > struct MemoryRegionSection { > > + Int128 size; > > MemoryRegion *mr; > > FlatView *fv; > > hwaddr offset_within_region; > > - Int128 size; > > hwaddr offset_within_address_space; > > bool readonly; > > bool nonvolatile; > > }; > > =20 > > +static inline bool MemoryRegionSection_eq(MemoryRegionSection *a, > > + MemoryRegionSection *b) > > +{ > > + return a->mr =3D=3D b->mr && > > + a->fv =3D=3D b->fv && > > + a->offset_within_region =3D=3D b->offset_within_region && > > + a->offset_within_address_space =3D=3D b->offset_within_ad= dress_space && > > + int128_eq(a->size, b->size) && > > + a->readonly =3D=3D b->readonly && > > + a->nonvolatile =3D=3D b->nonvolatile; > > +} > > + > > /** > > * memory_region_init: Initialize a memory region > > * > >=20 -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK