From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: dma-mapping: clearing GFP_ZERO flag caused crashes of Ethernet on arc/hsdk board. From: Alexey Brodkin Message-Id: <1522185558.6917.7.camel@synopsys.com> Date: Tue, 27 Mar 2018 21:19:19 +0000 To: "andy.shevchenko@gmail.com" Cc: "linux-kernel@vger.kernel.org" , "Alexey.Brodkin@synopsys.com" , "jesper.nilsson@axis.com" , "Eugeniy.Paltsev@synopsys.com" , "hch@lst.de" , "linux-snps-arc@lists.infradead.org" , "iommu@lists.linux-foundation.org" , "dmaengine@vger.kernel.org" , "Evgeniy.Didin@synopsys.com" , "geert@linux-m68k.org" List-ID: SGkgQW5keSwNCg0KT24gVHVlLCAyMDE4LTAzLTI3IGF0IDIxOjExICswMzAwLCBBbmR5IFNoZXZj aGVua28gd3JvdGU6DQo+IE9uIFR1ZSwgTWFyIDI3LCAyMDE4IGF0IDg6MTIgUE0sIEV2Z2VuaXkg RGlkaW4NCj4gPEV2Z2VuaXkuRGlkaW5Ac3lub3BzeXMuY29tPiB3cm90ZToNCj4gPiBIZWxsbywN Cj4gPiANCj4gPiBBZnRlciBjb21taXQgIDU3YmY1YTg5NjNmOCAoImRtYS1tYXBwaW5nOiBjbGVh ciBoYXJtZnVsIEdGUF8qIGZsYWdzIGluIGNvbW1vbiBjb2RlIikgIHdlIG5vdGljZWQgcHJvYmxl bXMgd2l0aCBFdGhlcm5ldCBjb250cm9sbGVyIG9uIG9uZSBvZiBvdXINCj4gPiBwbGF0Zm9ybXMg KG5hbWVseSBBUkMgSFNESykuDQo+ID4gSQ0KPiA+IG4gcGFydGljdWxhciB3ZSBzZWUgdGhhdCBy ZW1vdmFsIG9mIF9fR0ZQX1pFUk8gZmxhZyBpbiBmdW5jdGlvbiBkbWFfYWxsb2NfYXR0cnMoKSB3 YXMgdGhlIGN1bHByaXQgYmVjYXVzZSBpbiBvdXIgaW1wbGVtZW50YXRpb24gb2YgYXJjX2RtYV9h bGxvYygpDQo+ID4gd2Ugb25seSBhbGxvY2F0ZSB6ZXJvZWQgcGFnZXMgaWYNCj4gPiB0aGF0IGZs YWcgaXMgZXhwbGljaXRseSBzZXQgYnkgdGhlIGNhbGxlci4gTm93IHdpdGggdW5jb25kaXRpb25h bCByZW1vdmFsIG9mIHRoYXQgZmxhZyBpbiBkbWFfYWxsb2NfYXR0cnMoKSB3ZSBhbGxvY2F0ZSBu b24temVyb2VkIHBhZ2VzIGFuZCB0aGF0DQo+ID4gc2VlbSB0byBjYXVzZSBwcm9ibGVtcy4NCj4g PiANCj4gPiBGcm9tDQo+ID4gbWVudGlvbmVkIGNvbW1pdCBtZXNzYWdlIEkgbWF5IGNvbmNsdWRl IHRoYXQgYXJjaGl0ZWN0dXJhbCBjb2RlIGlzIHN1cHBvc2VkIHRvIGFsd2F5cyBhbGxvY2F0ZSB6 ZXJvZWQgcGFnZXMgYnV0IEkgY2Fubm90IGZpbmQgYW55IHJlcXVpcmVtZW50IG9mDQo+ID4gdGhh dCBpbiBrZXJuZWwncyBkb2N1bWVudGF0aW9uLg0KPiA+IENvdWwNCj4gPiBkIHlvdSBwbGVhc2Ug cG9pbnQgbWUgdG8gdGhhdCByZXF1aXJlbWVudCBpZiB0aGF0IGV4aXN0cyBhdCBhbGwsIHRoZW4g d2UnbGwgaW1wbGVtZW50IGEgZml4IGluIG91ciBhcmNoIGNvZGUgbGlrZSB0aGF0Og0KPiANCj4g Q2FuIHlvdSBlbGFib3JhdGUgd2hhdCBkcml2ZXIgaXMgaW4gdXNlPw0KPiBzdG1tYWMgd2l0aCBk d21hYy1hbmFyaW9uPw0KDQpJdCBpcyBpbmRlZWQgRFcgR01BQyAoQUtBIFNUTU1BQykgd2l0aCBi dWlsdC1pbiBETUEuDQoNCj4gSWYgc28sIHRoaXMgZHJpdmVyICh3L28gYW5hcmlvbiBwYXJ0cywg d2hpY2ggSSBiZWxpZXZlIGRvZXNuJ3QgaGF2ZQ0KPiBhbnl0aGluZyB0byBkbyB3aXRoIHRoaXMp IGlzIHdpZGVseSB1c2VkIG9uIG90aGVyIHBsYXRmb3Jtcy4NCj4gV2UgaGF2ZSB0byBzZWUgYSBs b3Qgb2YgcmVwb3J0cywgdGhvdWdoIG9ubHkgb25lIHNvIGZhcj8NCj4gDQo+IFRoZSBsb2dpY2Fs IHF1ZXN0aW9uIGlzIHdoeT8NCg0KMS4gU2VlIHRoYXQncyBhbm90aGVyIHBsYXRmb3JtIHdpdGgg QVJDIGNvcmUgc28gbWF5YmUgaW4gY2FzZSBvZiBBUk0NCiAgIERNQSBhbGxvY2F0b3IgYWxyZWFk eSB6ZXJvZXMgcGFnZXMgcmVnYXJkbGVzcyBwcm92aWRlZCBmbGFncyAtDQogICBwZXJzb25hbGx5 IEkgZGlkbid0IGNoZWNrIHRoYXQuDQoNCjIuIEV2ZW4gb24gSFNESyB3ZSBzYXcgdGhhdCBvbmx5 IG9uIGF0dGVtcHQgdG8gcnVuICJpcGVyZiIsIGV2ZW4gREhDUA0KICAgY2xpZW50IHdvcmtzIHBl cmZlY3RseSBmaW5lIG9uIHRoYXQgc2FtZSBwbGF0Zm9ybSBzbyBtYXliZSBvdGhlcnMNCiAgIGp1 c3QgZG9uJ3Qgc2VlIHByb2JsZW1zIHlldC4NCg0KMy4gV2hvIGtub3dzIGlmIFJDcyBhcmUgYmVp bmcgdGVzdGVkIG9uIG90aGVyIHBsYXRmb3JtcyB3aXRoDQogICBuZXR3b3JraW5nIHNvIG1heWJl IHNpbWlsYXIgcmVwb3J0cyB3aWxsIHN0YXJ0IHRvIGFwcGVhciBvbmNlDQogICA0LjE2IGdldHMg cmVsZWFzZWQuDQoNCi1BbGV4ZXkK