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[209.132.180.67]) by mx.google.com with ESMTP id y188-v6si7406571pgb.61.2018.05.14.01.01.25; Mon, 14 May 2018 01:01:40 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752117AbeENIAz (ORCPT + 99 others); Mon, 14 May 2018 04:00:55 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:60437 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750750AbeENIAx (ORCPT ); Mon, 14 May 2018 04:00:53 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id w4E7wvMH006949; Mon, 14 May 2018 10:00:40 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2hwq5e0sdb-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 14 May 2018 10:00:40 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 632E03F; Mon, 14 May 2018 08:00:38 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node2.st.com [10.75.127.14]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 123F32446; Mon, 14 May 2018 08:00:38 +0000 (GMT) Received: from SFHDAG5NODE3.st.com (10.75.127.15) by SFHDAG5NODE2.st.com (10.75.127.14) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Mon, 14 May 2018 10:00:37 +0200 Received: from SFHDAG5NODE3.st.com ([fe80::7c09:5d6b:d2c7:5f47]) by SFHDAG5NODE3.st.com ([fe80::7c09:5d6b:d2c7:5f47%20]) with mapi id 15.00.1347.000; Mon, 14 May 2018 10:00:37 +0200 From: Fabien DESSENNE To: Mauro Carvalho Chehab , Laurent Pinchart CC: Jean Christophe TROTIN , Yasunari Takiguchi , Sakari Ailus , "Luis R. Rodriguez" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-media@vger.kernel.org" Subject: Re: Are media drivers abusing of GFP_DMA? - was: Re: [LSF/MM TOPIC NOTES] x86 ZONE_DMA love Thread-Topic: Are media drivers abusing of GFP_DMA? - was: Re: [LSF/MM TOPIC NOTES] x86 ZONE_DMA love Thread-Index: AQHT5ItQQSTYoFbpC0CKaMHEuUh6r6QkI0wAgAAfnACACoXDgA== Date: Mon, 14 May 2018 08:00:37 +0000 Message-ID: <547252fc-dc74-93c6-fc77-be1bfb558787@st.com> References: <20180426215406.GB27853@wotan.suse.de> <20180505130815.53a26955@vento.lan> <3561479.qPIcrWnXEC@avalon> <20180507121916.4eb7f5b2@vento.lan> In-Reply-To: <20180507121916.4eb7f5b2@vento.lan> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.75.127.46] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-05-14_02:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCk9uIDA3LzA1LzE4IDE3OjE5LCBNYXVybyBDYXJ2YWxobyBDaGVoYWIgd3JvdGU6DQo+IEVt IE1vbiwgMDcgTWF5IDIwMTggMTY6MjY6MDggKzAzMDANCj4gTGF1cmVudCBQaW5jaGFydCA8bGF1 cmVudC5waW5jaGFydEBpZGVhc29uYm9hcmQuY29tPiBlc2NyZXZldToNCj4NCj4+IEhpIE1hdXJv LA0KPj4NCj4+IE9uIFNhdHVyZGF5LCA1IE1heSAyMDE4IDE5OjA4OjE1IEVFU1QgTWF1cm8gQ2Fy dmFsaG8gQ2hlaGFiIHdyb3RlOg0KPj4+IFRoZXJlIHdhcyBhIHJlY2VudCBkaXNjdXNzaW9uIGFi b3V0IHRoZSB1c2UvYWJ1c2Ugb2YgR0ZQX0RNQSBmbGFnIHdoZW4NCj4+PiBhbGxvY2F0aW5nIG1l bW9yaWVzIGF0IExTRi9NTSAyMDE4IChzZWUgTHVpcyBub3RlcyBlbmNsb3NlZCkuDQo+Pj4NCj4+ PiBUaGUgaWRlYSBzZWVtcyB0byBiZSB0byByZW1vdmUgaXQsIHVzaW5nIENNQSBpbnN0ZWFkLiBC ZWZvcmUgZG9pbmcgdGhhdCwNCj4+PiBiZXR0ZXIgdG8gY2hlY2sgaWYgd2hhdCB3ZSBoYXZlIG9u IG1lZGlhIGlzIGFyZSB2YWxpZCB1c2UgY2FzZXMgZm9yIGl0LCBvcg0KPj4+IGlmIGl0IGlzIHRo ZXJlIGp1c3QgZHVlIHRvIHNvbWUgbWlzdW5kZXJzdGFuZGluZyAob3IgYmVjYXVzZSBpdCB3YXMN Cj4+PiBjb3BpZWQgZnJvbSBzb21lIG90aGVyIGNvZGUpLg0KPj4+DQo+Pj4gSGFucyBkZSBHb2Vk ZSBzZW50IHVzIHRvZGF5IGEgcGF0Y2ggc3RvcHBpbmcgYWJ1c2UgYXQgZ3NwY2EsIGFuZCBJJ20N Cj4+PiBhbHNvIHBvc3RpbmcgdG9kYXkgdHdvIG90aGVyIHBhdGNoZXMgbWVhbnQgdG8gc3RvcCBh YnVzZSBvZiBpdCBvbiBVU0INCj4+PiBkcml2ZXJzLiBTdGlsbCwgdGhlcmUgYXJlIDQgcGxhdGZv cm0gZHJpdmVycyB1c2luZyBpdDoNCj4+Pg0KPj4+IAkkIGdpdCBncmVwIC1sIC1FICJHRlBfRE1B XFxiIiBkcml2ZXJzL21lZGlhLw0KPj4+IAlkcml2ZXJzL21lZGlhL3BsYXRmb3JtL29tYXAzaXNw L2lzcHN0YXQuYw0KPj4+IAlkcml2ZXJzL21lZGlhL3BsYXRmb3JtL3N0aS9iZGlzcC9iZGlzcC1o dy5jDQo+Pj4gCWRyaXZlcnMvbWVkaWEvcGxhdGZvcm0vc3RpL2h2YS9odmEtbWVtLmMNCg0KSGkg TWF1cm8sDQoNClRoZSB0d28gU1RJIGRyaXZlcnMgKGJkaXNwLWh3LmMgYW5kIGh2YS1tZW0uYykg YXJlIG9ubHkgZXhwZWN0ZWQgdG8gcnVuIA0Kb24gQVJNIHBsYXRmb3Jtcywgbm90IG9uIHg4Ni4N ClNpbmNlIHRoaXMgdGhyZWFkIGRlYWxzIHdpdGggeDg2ICYgRE1BIHRyb3VibGUsIEkgYW0gbm90 IHN1cmUgdGhhdCB3ZSANCmFjdHVhbGx5IGhhdmUgYSBwcm9ibGVtIGZvciB0aGUgc3RpIGRyaXZl cnMuDQoNClRoZXJlIGFyZSBzb21lIG90aGVyIHN0aSBkcml2ZXJzIHRoYXQgbWFrZSB1c2Ugb2Yg dGhpcyBHRlBfRE1BIGZsYWcgDQooZHJpdmVycy9ncHUvZHJtL3N0aS9zdGlfKi5jKSBhbmQgaXQg ZG9lcyBub3Qgc2VlbSB0byBiZSBhIHByb2JsZW0uDQoNCk5ldmVydGhlbGVzcyBJIGNhbiBzZWUg dGhhdCB0aGUgbWVkaWEgc3RpIGRyaXZlcnMgZGVwZW5kIG9uIENPTVBJTEVfVEVTVCANCih3aGlj aCBpcyBub3QgdGhlIGNhc2UgZm9yIHRoZSBEUk0gb25lcykuDQpXb3VsZCBpdCBiZSBhbiBhY2Nl cHRhYmxlIHNvbHV0aW9uIHRvIHJlbW92ZSB0aGUgQ09NUElMRV9URVNUIGRlcGVuZGVuY3k/DQoN CkJSDQoNCkZhYmllbg0KDQo+Pj4gCWRyaXZlcnMvbWVkaWEvc3BpL2N4ZDI4ODAtc3BpLmMNCj4+ Pg0KPj4+IENvdWxkIHlvdSBwbGVhc2UgY2hlY2sgaWYgR0ZQX0RNQSBpcyByZWFsbHkgbmVlZGVk IHRoZXJlLCBvciBpZiBpdCBpcw0KPj4+IGp1c3QgYmVjYXVzZSBvZiBzb21lIGN1dC1hbmQtcGFz dGUgZnJvbSBzb21lIG90aGVyIHBsYWNlPw0KPj4gSSBzdGFydGVkIGxvb2tpbmcgYXQgdGhhdCBm b3IgdGhlIG9tYXAzaXNwIGRyaXZlciBidXQgU2FrYXJpIGJlYXQgbWUgYXQNCj4+IHN1Ym1pdHRp bmcgYSBwYXRjaC4gR0ZQX0RNQSBpc24ndCBuZWVkZWQgZm9yIG9tYXAzaXNwLg0KPj4NCj4gVGhh bmsgeW91IGJvdGggZm9yIGxvb2tpbmcgaW50byBpdC4NCj4NCj4gUmVnYXJkcywNCj4gTWF1cm8N Cj4NCj4NCj4NCj4gVGhhbmtzLA0KPiBNYXVybw0K