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Mon, 23 Mar 2020 17:02:17 -0700 (PDT) Date: Tue, 24 Mar 2020 00:02:15 +0000 From: Changbin Du To: Mark Rutland Subject: Re: Two questions about cache coherency on arm platforms Message-ID: <20200324000214.xl7aomdboyby3b4g@mail.google.com> References: <20200323123524.w67fici6oxzdo665@mail.google.com> <20200323131720.GE2597@C02TD0UTHF1T.local> <20200323161537.ptjrihqotgmon7tr@mail.google.com> <20200323164723.GA8652@lakrids.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200323164723.GA8652@lakrids.cambridge.arm.com> User-Agent: NeoMutt/20180716-508-7c9a6d X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200323_170219_232872_5FD44D36 X-CRM114-Status: GOOD ( 20.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Changbin Du Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gTW9uLCBNYXIgMjMsIDIwMjAgYXQgMDQ6NDc6MjRQTSArMDAwMCwgTWFyayBSdXRsYW5kIHdy b3RlOgo+IE9uIE1vbiwgTWFyIDIzLCAyMDIwIGF0IDA0OjE1OjQwUE0gKzAwMDAsIENoYW5nYmlu IER1IHdyb3RlOgo+ID4gSGkgTWFyaywKPiA+IFRoYW5rcyBmb3IgeW91ciBhbnN3ZXIuIEkgc3Rp bGwgZG9uJ3QgdW5kZXJzdGFuZCB0aGUgZmlyc3QgcXVlc3Rpb24uCj4gPiAKPiA+IE9uIE1vbiwg TWFyIDIzLCAyMDIwIGF0IDAxOjE3OjIwUE0gKzAwMDAsIE1hcmsgUnV0bGFuZCB3cm90ZToKPiA+ ID4gT24gTW9uLCBNYXIgMjMsIDIwMjAgYXQgMDg6MzU6MjZQTSArMDgwMCwgQ2hhbmdiaW4gRHUg d3JvdGU6Cj4gPiA+ID4gSGksIEFsbCwKPiA+ID4gPiBJIGFtIG5vdCB2ZXJ5IGZhbWlsaWFyIHdp dGggQVJNIHByb2Nlc3NvcnMuIEkgaGF2ZSB0d28gcXVlc3Rpb25zIGFib3V0Cj4gPiA+ID4gY2Fj aGUgY29oZXJlbmN5LiBDb3VsZCBhbnlvbmUgaGVscCBtZT8KPiA+ID4gPiAKPiA+ID4gPiAxLiBI b3cgaXMgY2FjaGUgY29oZXJlbmN5IG1haW50ZW5hbmNlZCBvbiBBUk12OCBiaWcuTElUVExFIHN5 c3RlbT8KPiA+ID4gPiBBcyBmYXIgYXMgSSBrbm93LCBiaWcgY29yZXMgYW5kIGxpdHRsZSBjb3Jl cyBhcmUgaW4gc2VwZXJhdGUgY2x1c3RlcnMgb24KPiA+ID4gPiBiaWcuTElUVExFIHN5c3RlbS4K PiA+ID4gCj4gPiA+IFRoaXMgaXMgb2Z0ZW4gdHJ1ZSwgYnV0IG5vdCBhbHdheXMgdGhlIGNhc2Uu IEZvciBleGFtcGxlLCB3aXRoIERTVSBiaWcKPiA+ID4gYW5kIGxpdHRsZSBjb3JlcyBjYW4gYmUg cGxhY2VkIHdpdGhpbiB0aGUgc2FtZSBjbHVzdGVyLgo+ID4gCj4gPiBZZXMsIGl0IGlzIHR1cmUg Zm9yIER5bmFtSVEgdGhhdCBibCBjb3JlcyBjYW4gYmUgcGxhY2VkIHdpdGhpbiB0aGUgc2FtZSBj bHVzdGVyLgo+ID4gQnV0IEkgZG9uJ3QgdW5kZXJzdGFuZCBob3cgbGludXggc3VwcG9ydCBiaWcu TElUVExFIGJlZm9yZSBEeW5hbUlRLgo+IAo+IE11bHRpcGxlIGNsdXN0ZXJzIGNhbiBiZSBpbiB0 aGUgc2FtZSBJbm5lciBTaGFyZWFibGUgZG9tYWluLCBhbmQgTGludXgKPiByZWxpZXMgb24gdGhp cyBiZWluZyB0aGUgY2FzZSBmb3Igc3lzdGVtcyBpdCBzdXBwb3J0cy4gSXQncyBwb3NzaWJsZSB0 bwo+IGJ1aWxkIGEgc3lzdGVtIHdoZXJlIGNsdXN0ZXJzIGFyZSBpbiBkaXN0aW5jdCBJbm5lciBT aGFyZWFibGUgZG9tYWlucywKPiBidXQgTGludXggZG9lcyBub3Qgc3VwcG9ydCB1c2luZyBhbGwg Y29yZXMgb24gc3VjaCBhIHN5c3RlbS4KPiAKPiBFdmVuIHdpdGggQ0NJLCBDQ04sIENNTiwgZXRj LCBMaW51eCByZXF1aXJlcyB0aGF0IGFsbCBjb3JlcyAod2hpY2ggaXQgaXMKPiB0b2xkIGFib3V0 KSBhcmUgaW4gdGhlIHNhbWUgSW5uZXIgU2hhcmVhYmxlIGRvbWFpbi4gVGhhdCBpcyB3aGF0IGlz Cj4gY29tbW9ubHkgYnVpbHQuCj4KVGhhbmsgeW91LCBJIHNlZSBub3cuIEkgdGhvdWdodCBjbHVz dGVycyBtdXN0IGJlIGluIGRpc3RpbmN0IElubmVyClNoYXJlYWJsZSBkb21haW5zLiBTbyBJIHdh cyB3cm9uZy4gVGhlIG1hbm51YWwgaXMgc29tZXdoYXQgbWlzbGVhZGluZy4KCj4gPiBJIHJlYWQg YmVsb3cgZGVzY3JpcHRpb24gaW4gQVJNIENvcnRleC1BIFNlcmllcyBQcm9ncmFtbWVy4oCZcyBH dWlkZSBmb3IKPiA+IEFSTXY4LUEuCj4gPiAgfCBiaWcuTElUVExFIHNvZnR3YXJlIG1vZGVscyBy ZXF1aXJlIHRyYW5zcGFyZW50IGFuZCBlZmZpY2llbnQgdHJhbnNmZXIgb2YgZGF0YSBiZXR3ZWVu IGJpZyBhbmQgTElUVExFIGNsdXN0ZXJzLgo+ID4gIHwgQ29oZXJlbmN5IGJldHdlZW4gY2x1c3Rl cnMgaXMgcHJvdmlkZWQgYnkgYSBjYWNoZS1jb2hlcmVudCBpbnRlcmNvbm5lY3Qgc3VjaCBhcyB0 aGUgQVJNIENvcmVMaW5rIENDSS00MDAgZGVzY3JpYmVkIGluIENoYXB0ZXIgMTQuCj4gPiAKPiA+ IFNvIEkgdGhpbmsgIGJpZyBjb3JlcyBhbmQgbGl0dGxlIGNvcmVzIGFyZSBpbiBkaWZmZXJlbnQg Y2x1c3RlcnMgaW4gdGhpcwo+ID4gY2FzZS4gVGhlbiB3ZSBhcmUgbm90IHdpdGhpbiB0aGUgc2Ft ZSBJbm5lciBTaGFyZWFibGUgZG9tYWluPwo+IAo+IExpbnV4IHJlcXVpcmVzIHRoYXQgdGhvc2Ug Y2x1c3RlcnMgYXJlIGluIHRoZSBzYW1lIElubmVyIFNoYXJlYWJsZQo+IGRvbWFpbiwgYW5kIHRo YXQncyB3aGF0IHBlb3BsZSAobW9zdGx5KSBidWlsZCB0b2RheS4KPiAKPiBUaGFua3MsCj4gTWFy ay4KCi0tIApDaGVlcnMsCkNoYW5nYmluIER1CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1h cm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==