From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexey Brodkin Subject: Re: arc_usr_cmpxchg and preemption Date: Fri, 16 Mar 2018 17:33:27 +0000 Message-ID: <1521221606.4805.16.camel@synopsys.com> References: <1521045375.11552.27.camel@synopsys.com> <20180314175352.GP4064@hirez.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20180314175352.GP4064@hirez.programming.kicks-ass.net> Content-Language: en-US Content-ID: Sender: linux-kernel-owner@vger.kernel.org To: "peterz@infradead.org" , Vineet Gupta Cc: "linux-kernel@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" List-Id: linux-arch.vger.kernel.org SGkgUGV0ZXIsIFZpbmVldCwNCg0KT24gV2VkLCAyMDE4LTAzLTE0IGF0IDE4OjUzICswMTAwLCBQ ZXRlciBaaWpsc3RyYSB3cm90ZToNCj4gT24gV2VkLCBNYXIgMTQsIDIwMTggYXQgMDk6NTg6MTlB TSAtMDcwMCwgVmluZWV0IEd1cHRhIHdyb3RlOg0KPiANCj4gPiBXZWxsIGl0IGlzIGJyb2tlbiB3 cnQgdGhlIHNlbWFudGljcyB0aGUgc3lzY2FsbCBpcyBzdXBwb3NlZCB0byBwcm92aWRlLg0KPiA+ IFByZWVtcHRpb24gZGlzYWJsaW5nIGlzIHdoYXQgcHJldmVudHMgYSBjb25jdXJyZW50IHRocmVh ZCBmcm9tIGNvbWluZyBpbiBhbmQNCj4gPiBtb2RpZnlpbmcgdGhlIHNhbWUgbG9jYXRpb24gKElt YWdpbmUgYSB2YXJpYWJsZSB3aGljaCBpcyBiZWluZyBjbXB4Y2hnDQo+ID4gY29uY3VycmVudGx5 IGJ5IDIgdGhyZWFkcykuDQo+ID4gDQo+ID4gT25lIGFwcHJvYWNoIGlzIHRvIGRvIGl0IHRoZSBN SVBTIHdheSwgZW11bGF0ZSB0aGUgbGxzYyBmbGFnIC0gc2V0IGl0IHVuZGVyDQo+ID4gcHJlZW1w dGlvbiBkaXNhYmxlZCBzZWN0aW9uIGFuZCBjbGVhciBpdCBpbiBzd2l0Y2hfdG8NCj4gDQo+ICpz aHVkZGVyKi4uLiBqdXN0IGNhdGNoIHRoZSAtRUZBVUxULCBmb3JjZSB0aGUgd3JpdGUgZmF1bHQg YW5kIHJldHJ5Lg0KDQpNb3JlIEkgbG9vayBhdCB0aGlzIGluaXRpYWxseSBxdWl0ZSBzaW1wbGUg dGhpbmcgbW9yZSBpdCBsb29rcyBsaWtlDQphIGNhbiBvZiB3b3Jtcy4uLg0KDQo+IFNvbWV0aGlu ZyBsaWtlOg0KPiANCj4gaW50IHN5c19jbXB4Y2hnKHUzMiBfX3VzZXIgKnVzZXJfcHRyLCB1MzIg b2xkLCB1MzIgbmV3KQ0KPiB7DQoNClRoYXQgZnVuY3Rpb25zIGlzIHN1cHBvc2VkIHRvIHJldHVy biBvbGQgdmFsdWUgc3RvcmVkIGluIG1lbW9yeS4NCkF0IGxlYXN0IHRoYXQncyBob3cgaXQgaXMg dXNlZCBpbiBjYXNlIG9mIEFSQyBhbmQgTTY4Sy4NCg0KUmVtZW1iZXIgdGhlcmUncyBhbHJlYWR5 IGxpYmMgdGhhdCByZWxpZXMgb24gdGhhdCBlc3RhYmxpc2hlZCBBUEkNCmFuZCB3ZSBjYW5ub3Qg anVzdCBjaGFuZ2UgaXQuLi4gZXZlbiB0aG91Z2ggaXQgbWlnaHQgYmUgYSBnb29kIGlkZWEuDQpG b3IgZXhhbXBsZSByZXR1cm4gImVycm5vIiBhbmQgcGFzcyBvbGQgdmFsdWUgdmlhIHBvaW50ZXIg aW4gYW4gYXJndW1lbnQuDQpCdXQgbm93IEkgZ3Vlc3MgaXQncyBiZXR0ZXIgdG8gdXNlIHdoYXQg d2UgaGF2ZSBub3cuDQoNCj4gCXUzMiB2YWw7DQo+IAlpbnQgcmV0Ow0KPiANCj4gYWdhaW46DQo+ IAlyZXQgPSAwOw0KPiANCj4gCXByZWVtcHRfZGlzYWJsZSgpOw0KPiAJdmFsID0gZ2V0X3VzZXIo dXNlcl9wdHIpOw0KDQpXaGF0IGlmIGdldF91c2VyKCkgZmFpbHM/DQpJbiBQZXRlcidzIGltcGxl bWVudGF0aW9uIHdlIHdpbGwgcmV0dXJuIDAsIGluIFZpbmVldCdzDQp3ZSB3aWxsIHJldHVybiAt RUZBVUxULi4uIGFuZCB3aG8ga25vd3Mgd2hhdCBraW5kIG9mIHVuZXhwZWN0ZWQgYmVoYXZpb3Ig aGFwcGVucw0KZnVydGhlciBkb3duIHRoZSBsaW5lIGluIHVzZXItc3BhY2UuLi4gc28gSSB0aGlu ayBpdCB3b3VsZCBiZSBzYWZlciB0byBraWxsDQp0aGUgcHJvY2VzcyB0aGVuLg0KDQpBbmQgdGhh dCdzIG15IHRha2U6DQotLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLT44LS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tDQppbnQgc3lzX2NtcHhjaGcodTMyIF9fdXNlciAqdXNlcl9wdHIsIHUzMiBvbGQs IHUzMiBuZXcpDQp7DQoJdTMyIHZhbDsNCglpbnQgcmV0Ow0KDQphZ2FpbjoNCglyZXQgPSAwOw0K DQoJcHJlZW1wdF9kaXNhYmxlKCk7DQoNCglyZXQgPSBnZXRfdXNlcih2YWwsIHVzZXJfcHRyKTsN CglpZihyZXQgPT0gLUVGQVVMVCkgew0KCQlzdHJ1Y3QgcGFnZSAqcGFnZTsNCg0KCQlwcmVlbXB0 X2VuYWJsZSgpOw0KCQlyZXQgPSBnZXRfdXNlcl9wYWdlc19mYXN0KCh1bnNpZ25lZCBsb25nKXVz ZXJfcHRyLCAxLCAxLCAmcGFnZSk7DQoJCWlmIChyZXQgPCAwKSB7DQoJCQlmb3JjZV9zaWcoU0lH U0VHViwgY3VycmVudCk7DQoJCQlyZXR1cm4gcmV0Ow0KCQl9DQoNCgkJcHV0X3BhZ2UocGFnZSk7 DQoJCWdvdG8gYWdhaW47DQoJfQ0KDQoJaWYgKHZhbCA9PSBvbGQpDQoJCXJldCA9IHB1dF91c2Vy KG5ldywgdXNlcl9wdHIpOw0KDQoJcHJlZW1wdF9lbmFibGUoKTsNCg0KCWlmIChyZXQgPT0gLUVG QVVMVCkgew0KCQlzdHJ1Y3QgcGFnZSAqcGFnZTsNCg0KCQlyZXQgPSBnZXRfdXNlcl9wYWdlc19m YXN0KCh1bnNpZ25lZCBsb25nKXVzZXJfcHRyLCAxLCAxLCAmcGFnZSk7DQoJCWlmIChyZXQgPCAw KSB7DQoJCQlmb3JjZV9zaWcoU0lHU0VHViwgY3VycmVudCk7DQoJCQlyZXR1cm4gcmV0Ow0KCQl9 DQoNCgkJcHV0X3BhZ2UocGFnZSk7DQoJCWdvdG8gYWdhaW47DQoJfQ0KDQoJcmV0dXJuIHJldDsN Cn0NCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tPjgtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0N Cg0KLUFsZXhleQ== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us01smtprelay-2.synopsys.com ([198.182.60.111]:39690 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752948AbeCPRdj (ORCPT ); Fri, 16 Mar 2018 13:33:39 -0400 From: Alexey Brodkin Subject: Re: arc_usr_cmpxchg and preemption Date: Fri, 16 Mar 2018 17:33:27 +0000 Message-ID: <1521221606.4805.16.camel@synopsys.com> References: <1521045375.11552.27.camel@synopsys.com> <20180314175352.GP4064@hirez.programming.kicks-ass.net> In-Reply-To: <20180314175352.GP4064@hirez.programming.kicks-ass.net> Content-Language: en-US Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-arch-owner@vger.kernel.org List-ID: To: "peterz@infradead.org" , Vineet Gupta Cc: "linux-kernel@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" Message-ID: <20180316173327.AekMM0H14bkrWuiMD85ww_zL1OyqSjbQDIT60b9Mwfw@z> SGkgUGV0ZXIsIFZpbmVldCwNCg0KT24gV2VkLCAyMDE4LTAzLTE0IGF0IDE4OjUzICswMTAwLCBQ ZXRlciBaaWpsc3RyYSB3cm90ZToNCj4gT24gV2VkLCBNYXIgMTQsIDIwMTggYXQgMDk6NTg6MTlB TSAtMDcwMCwgVmluZWV0IEd1cHRhIHdyb3RlOg0KPiANCj4gPiBXZWxsIGl0IGlzIGJyb2tlbiB3 cnQgdGhlIHNlbWFudGljcyB0aGUgc3lzY2FsbCBpcyBzdXBwb3NlZCB0byBwcm92aWRlLg0KPiA+ IFByZWVtcHRpb24gZGlzYWJsaW5nIGlzIHdoYXQgcHJldmVudHMgYSBjb25jdXJyZW50IHRocmVh ZCBmcm9tIGNvbWluZyBpbiBhbmQNCj4gPiBtb2RpZnlpbmcgdGhlIHNhbWUgbG9jYXRpb24gKElt YWdpbmUgYSB2YXJpYWJsZSB3aGljaCBpcyBiZWluZyBjbXB4Y2hnDQo+ID4gY29uY3VycmVudGx5 IGJ5IDIgdGhyZWFkcykuDQo+ID4gDQo+ID4gT25lIGFwcHJvYWNoIGlzIHRvIGRvIGl0IHRoZSBN SVBTIHdheSwgZW11bGF0ZSB0aGUgbGxzYyBmbGFnIC0gc2V0IGl0IHVuZGVyDQo+ID4gcHJlZW1w dGlvbiBkaXNhYmxlZCBzZWN0aW9uIGFuZCBjbGVhciBpdCBpbiBzd2l0Y2hfdG8NCj4gDQo+ICpz aHVkZGVyKi4uLiBqdXN0IGNhdGNoIHRoZSAtRUZBVUxULCBmb3JjZSB0aGUgd3JpdGUgZmF1bHQg YW5kIHJldHJ5Lg0KDQpNb3JlIEkgbG9vayBhdCB0aGlzIGluaXRpYWxseSBxdWl0ZSBzaW1wbGUg dGhpbmcgbW9yZSBpdCBsb29rcyBsaWtlDQphIGNhbiBvZiB3b3Jtcy4uLg0KDQo+IFNvbWV0aGlu ZyBsaWtlOg0KPiANCj4gaW50IHN5c19jbXB4Y2hnKHUzMiBfX3VzZXIgKnVzZXJfcHRyLCB1MzIg b2xkLCB1MzIgbmV3KQ0KPiB7DQoNClRoYXQgZnVuY3Rpb25zIGlzIHN1cHBvc2VkIHRvIHJldHVy biBvbGQgdmFsdWUgc3RvcmVkIGluIG1lbW9yeS4NCkF0IGxlYXN0IHRoYXQncyBob3cgaXQgaXMg dXNlZCBpbiBjYXNlIG9mIEFSQyBhbmQgTTY4Sy4NCg0KUmVtZW1iZXIgdGhlcmUncyBhbHJlYWR5 IGxpYmMgdGhhdCByZWxpZXMgb24gdGhhdCBlc3RhYmxpc2hlZCBBUEkNCmFuZCB3ZSBjYW5ub3Qg anVzdCBjaGFuZ2UgaXQuLi4gZXZlbiB0aG91Z2ggaXQgbWlnaHQgYmUgYSBnb29kIGlkZWEuDQpG b3IgZXhhbXBsZSByZXR1cm4gImVycm5vIiBhbmQgcGFzcyBvbGQgdmFsdWUgdmlhIHBvaW50ZXIg aW4gYW4gYXJndW1lbnQuDQpCdXQgbm93IEkgZ3Vlc3MgaXQncyBiZXR0ZXIgdG8gdXNlIHdoYXQg d2UgaGF2ZSBub3cuDQoNCj4gCXUzMiB2YWw7DQo+IAlpbnQgcmV0Ow0KPiANCj4gYWdhaW46DQo+ IAlyZXQgPSAwOw0KPiANCj4gCXByZWVtcHRfZGlzYWJsZSgpOw0KPiAJdmFsID0gZ2V0X3VzZXIo dXNlcl9wdHIpOw0KDQpXaGF0IGlmIGdldF91c2VyKCkgZmFpbHM/DQpJbiBQZXRlcidzIGltcGxl bWVudGF0aW9uIHdlIHdpbGwgcmV0dXJuIDAsIGluIFZpbmVldCdzDQp3ZSB3aWxsIHJldHVybiAt RUZBVUxULi4uIGFuZCB3aG8ga25vd3Mgd2hhdCBraW5kIG9mIHVuZXhwZWN0ZWQgYmVoYXZpb3Ig aGFwcGVucw0KZnVydGhlciBkb3duIHRoZSBsaW5lIGluIHVzZXItc3BhY2UuLi4gc28gSSB0aGlu ayBpdCB3b3VsZCBiZSBzYWZlciB0byBraWxsDQp0aGUgcHJvY2VzcyB0aGVuLg0KDQpBbmQgdGhh dCdzIG15IHRha2U6DQotLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLT44LS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tDQppbnQgc3lzX2NtcHhjaGcodTMyIF9fdXNlciAqdXNlcl9wdHIsIHUzMiBvbGQs IHUzMiBuZXcpDQp7DQoJdTMyIHZhbDsNCglpbnQgcmV0Ow0KDQphZ2FpbjoNCglyZXQgPSAwOw0K DQoJcHJlZW1wdF9kaXNhYmxlKCk7DQoNCglyZXQgPSBnZXRfdXNlcih2YWwsIHVzZXJfcHRyKTsN CglpZihyZXQgPT0gLUVGQVVMVCkgew0KCQlzdHJ1Y3QgcGFnZSAqcGFnZTsNCg0KCQlwcmVlbXB0 X2VuYWJsZSgpOw0KCQlyZXQgPSBnZXRfdXNlcl9wYWdlc19mYXN0KCh1bnNpZ25lZCBsb25nKXVz ZXJfcHRyLCAxLCAxLCAmcGFnZSk7DQoJCWlmIChyZXQgPCAwKSB7DQoJCQlmb3JjZV9zaWcoU0lH U0VHViwgY3VycmVudCk7DQoJCQlyZXR1cm4gcmV0Ow0KCQl9DQoNCgkJcHV0X3BhZ2UocGFnZSk7 DQoJCWdvdG8gYWdhaW47DQoJfQ0KDQoJaWYgKHZhbCA9PSBvbGQpDQoJCXJldCA9IHB1dF91c2Vy KG5ldywgdXNlcl9wdHIpOw0KDQoJcHJlZW1wdF9lbmFibGUoKTsNCg0KCWlmIChyZXQgPT0gLUVG QVVMVCkgew0KCQlzdHJ1Y3QgcGFnZSAqcGFnZTsNCg0KCQlyZXQgPSBnZXRfdXNlcl9wYWdlc19m YXN0KCh1bnNpZ25lZCBsb25nKXVzZXJfcHRyLCAxLCAxLCAmcGFnZSk7DQoJCWlmIChyZXQgPCAw KSB7DQoJCQlmb3JjZV9zaWcoU0lHU0VHViwgY3VycmVudCk7DQoJCQlyZXR1cm4gcmV0Ow0KCQl9 DQoNCgkJcHV0X3BhZ2UocGFnZSk7DQoJCWdvdG8gYWdhaW47DQoJfQ0KDQoJcmV0dXJuIHJldDsN Cn0NCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tPjgtLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0N Cg0KLUFsZXhleQ==