From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) (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 0AAE854BD3 for ; Mon, 19 Feb 2024 22:04:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.58.86.151 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708380267; cv=none; b=UzsLdXtgPVttBStsayXN0Zp5JF233MofP2vEpJT4aVH5yEyQS/1ly8mfcm3bmVfAmSBtyBmJ6QgOE+SbLjCro2eOgFhpK52k+NpZIgwuOVUqaXkz73Gz0pd8g7MKcKMYUHcFtjVl3uhUpahGteVM06F6kbxhewp4cYcGcrEk5so= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708380267; c=relaxed/simple; bh=wGBpGmm0pryXTSVl375tM6ptyiYo9QDZ14tUKhpTBYY=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: MIME-Version:Content-Type; b=mABNE6zoIrbOSyN7aIKscjKTmchLRoVP0ASzB4Vkj41IPKQ63Gnp3x7p4oAHG53Y5gSO2uABuhiuNNsw8eQgVM4ZVC5/o/O4DbxhNFQzQ+LLu3osao4ePovb6nDGexfkp0h6FPwSh38qeu4UupRWdxi4he0q6YU/m2Tdqzl57Ig= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM; spf=pass smtp.mailfrom=aculab.com; arc=none smtp.client-ip=185.58.86.151 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aculab.com Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-165-IxcL2ivMNcyUbohMtyxFYQ-1; Mon, 19 Feb 2024 22:04:21 +0000 X-MC-Unique: IxcL2ivMNcyUbohMtyxFYQ-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Mon, 19 Feb 2024 22:04:20 +0000 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Mon, 19 Feb 2024 22:04:20 +0000 From: David Laight To: 'Kent Overstreet' CC: "Russell King (Oracle)" , Arnd Bergmann , Calvin Owens , Dave Martin , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-bcachefs@vger.kernel.org" Subject: RE: [PATCH] arm: Silence gcc warnings about arch ABI drift Thread-Topic: [PATCH] arm: Silence gcc warnings about arch ABI drift Thread-Index: AQHaYxoBs2nLAxuyWkKD0kyGLfcL8bESE6VAgAAeCwCAAAce8A== Date: Mon, 19 Feb 2024 22:04:20 +0000 Message-ID: References: <431dd956-ad31-4da8-ad42-34f7380824bb@app.fastmail.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable From: Kent Overstreet > Sent: 19 February 2024 21:38 >=20 > On Mon, Feb 19, 2024 at 07:53:15PM +0000, David Laight wrote: > > ... > > > I'm not always trying to write code that will generate the fastest > > > assembly possible; there aro other considerations. As long a the > > > compiler is doing something /reasonable/, the code is fine. > > > > Speaks the man who was writing horrid 'jit' code ... > > > > This also begs the question of why that data is so compressed > > in the first place? > > It is quite likely that a few accesses generate far more code > > than the data you are attempting to save. >=20 > It's easy to understand if you understand profiling, benchmarking and > cache effects. And how arguments get passed to functions :-) =09David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1= PT, UK Registration No: 1397386 (Wales)