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Tue, 9 Feb 2021 17:16:46 +0000 From: David Laight To: 'Christophe Leroy' , 'Segher Boessenkool' , Nicholas Piggin Subject: RE: [PATCH v5 20/22] powerpc/syscall: Avoid storing 'current' in another pointer Thread-Topic: [PATCH v5 20/22] powerpc/syscall: Avoid storing 'current' in another pointer Thread-Index: AQHW/uu6M1m95GjSlEGhmhkEL2m4wKpP4cNQgAArZICAAAJwgA== Date: Tue, 9 Feb 2021 17:16:46 +0000 Message-ID: References: <24804747098369ebcdac38970b8f7a1260bdd248.1612796617.git.christophe.leroy@csgroup.eu> <1612838134.rvncv9kzls.astroid@bobo.none> <20210209135053.GD27854@gate.crashing.org> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Mackerras , "msuchanek@suse.de" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" RnJvbTogQ2hyaXN0b3BoZSBMZXJveSA8Y2hyaXN0b3BoZS5sZXJveUBjc2dyb3VwLmV1Pg0KPiBT ZW50OiAwOSBGZWJydWFyeSAyMDIxIDE3OjA0DQo+IA0KPiBMZSAwOS8wMi8yMDIxIMOgIDE1OjMx LCBEYXZpZCBMYWlnaHQgYSDDqWNyaXTCoDoNCj4gPiBGcm9tOiBTZWdoZXIgQm9lc3Nlbmtvb2wN Cj4gPj4gU2VudDogMDkgRmVicnVhcnkgMjAyMSAxMzo1MQ0KPiA+Pg0KPiA+PiBPbiBUdWUsIEZl YiAwOSwgMjAyMSBhdCAxMjozNjoyMFBNICsxMDAwLCBOaWNob2xhcyBQaWdnaW4gd3JvdGU6DQo+ ID4+PiBXaGF0IGlmIHlvdSBkaWQgdGhpcz8NCj4gPj4NCj4gPj4+ICtzdGF0aWMgaW5saW5lIHN0 cnVjdCB0YXNrX3N0cnVjdCAqZ2V0X2N1cnJlbnQodm9pZCkNCj4gPj4+ICt7DQo+ID4+PiArCXJl Z2lzdGVyIHN0cnVjdCB0YXNrX3N0cnVjdCAqdGFzayBhc20gKCJyMiIpOw0KPiA+Pj4gKw0KPiA+ Pj4gKwlyZXR1cm4gdGFzazsNCj4gPj4+ICt9DQo+ID4+DQo+ID4+IExvY2FsIHJlZ2lzdGVyIGFz bSB2YXJpYWJsZXMgYXJlICpvbmx5KiBndWFyYW50ZWVkIHRvIGxpdmUgaW4gdGhhdA0KPiA+PiBy ZWdpc3RlciBhcyBvcGVyYW5kcyB0byBhbiBhc20uICBTZWUNCj4gPj4gICAgaHR0cHM6Ly9nY2Mu Z251Lm9yZy9vbmxpbmVkb2NzL2djYy9Mb2NhbC1SZWdpc3Rlci1WYXJpYWJsZXMuaHRtbCNMb2Nh bC1SZWdpc3Rlci1WYXJpYWJsZXMNCj4gPj4gKCJUaGUgb25seSBzdXBwb3J0ZWQgdXNlIiBldGMu KQ0KPiA+Pg0KPiA+PiBZb3UgY2FuIGRvIHNvbWV0aGluZyBsaWtlDQo+ID4+DQo+ID4+IHN0YXRp YyBpbmxpbmUgc3RydWN0IHRhc2tfc3RydWN0ICpnZXRfY3VycmVudCh2b2lkKQ0KPiA+PiB7DQo+ ID4+IAlyZWdpc3RlciBzdHJ1Y3QgdGFza19zdHJ1Y3QgKnRhc2sgYXNtICgicjIiKTsNCj4gPj4N Cj4gPj4gCWFzbSgiIiA6ICIrciIodGFzaykpOw0KPiA+Pg0KPiA+PiAJcmV0dXJuIHRhc2s7DQo+ ID4+IH0NCj4gPj4NCj4gPj4gd2hpY2ggbWFrZXMgc3VyZSB0aGF0ICJ0YXNrIiBhY3R1YWxseSBp cyBpbiByMiBhdCB0aGUgcG9pbnQgb2YgdGhhdCBhc20uDQo+ID4NCj4gPiBJZiAicjIiIGFsd2F5 cyBjb250YWlucyBjdXJyZW50IChhbmQgaXMgbmV2ZXIgYXNzaWduZWQgYnkgdGhlIGNvbXBpbGVy KQ0KPiA+IHdoeSBub3QgdXNlIGEgZ2xvYmFsIHJlZ2lzdGVyIHZhcmlhYmxlIGZvciBpdD8NCj4g Pg0KPiANCj4gDQo+IFRoZSBjaGFuZ2UgcHJvcG9zZWQgYnkgTmljayBkb2Vzbid0IHNvbHZlIHRo ZSBpc3N1ZS4NCj4gDQo+IFRoZSBwcm9ibGVtIGlzIHRoYXQgYXQgdGhlIGJlZ2luaW5nIG9mIHRo ZSBmdW5jdGlvbiB3ZSBoYXZlOg0KPiANCj4gCXVuc2lnbmVkIGxvbmcgKnRpX2ZsYWdzcCA9ICZj dXJyZW50X3RocmVhZF9pbmZvKCktPmZsYWdzOw0KPiANCj4gV2hlbiB0aGUgZnVuY3Rpb24gdXNl cyB0aV9mbGFnc3AgZm9yIHRoZSBmaXJzdCB0aW1lLCBpdCBkb2VzIHVzZSAxMTIocjIpDQo+IA0K PiBUaGVuIHRoZSBmdW5jdGlvbiBjYWxscyBzb21lIG90aGVyIGZ1bmN0aW9ucy4NCj4gDQo+IE1v c3QgbGlrZWx5IGJlY2F1c2UgdGhlIGZ1bmN0aW9uIGNvdWxkIHVwZGF0ZSAnY3VycmVudCcsIEdD QyBjb3BpZXMgcjIgaW50byByMzAsIHNvIHRoYXQgaWYgcjIgZ2V0DQo+IGNoYW5nZWQgYnkgdGhl IGNhbGxlZCBmdW5jdGlvbiwgdGlfZmxhZ3NwIGlzIHN0aWxsIGJhc2VkIG9uIHRoZSBwcmV2aW91 cyB2YWx1ZSBvZiBjdXJyZW50Lg0KPiANCj4gQWxsdGhvdWdoIHdlIGtub3cgcjIgd29udCBjaGFu Z2UsIEdDQyBkb2Vzbid0IGtub3cgaXQuIEFuZCBpbiBvcmRlciB0byBzYXZlIHIyIGludG8gcjMw LCBpdCBuZWVkcyB0bw0KPiBzYXZlIHIzMCBpbiB0aGUgc3RhY2suDQo+IA0KPiANCj4gQnkgdXNp bmcgJmN1cnJlbnRfdGhyZWFkX2luZm8oKS0+ZmxhZ3MgZGlyZWN0bHkgaW5zdGVhZCBvZiB0aGlz IGludGVybWVkaWFpdGUgdGlfZmxhZ3NwIHBvaW50ZXIsIEdDQw0KPiB1c2VzIHIyIGluc3RlYWQg aW5zdGVhZCBvZiBkb2luZyBhIGNvcHkuDQoNCkRvZXMgbWFya2luZyBjdXJyZW50X3RocmVhZF9p bmZvKCkgJ3B1cmUnIChJIHRoaW5rIHRoYXQgdGhlIHJpZ2h0IG9uZSkNCndvcmsgLSBzbyB0aGF0 IGdjYyBrbm93cyBpdHMgcmVzdWx0IGRvZXNuJ3QgZGVwZW5kIG9uIGV4dGVybmFsIGRhdGENCmFu ZCB0aGF0IGl0IGRvZXNuJ3QgY2hhbmdlIGV4dGVybmFsIGRhdGEuDQoNCkFsdGhvdWdoIEknbSBu b3QgMTAwJSBob3cgd2VsbCB0aG9zZSBhdHRyaWJ1dGVzIGFjdHVhbGx5IHdvcmsuDQoNCj4gTmlj aywgSSBkb24ndCB1bmRlcnN0YW5kIHRoZSByZWFzb24gd2h5IHlvdSBuZWVkIHRoYXQgJ3RpX2Zs YWdzcCcgbG9jYWwgdmFyLg0KDQpQcm9iYWJseSB0byBzYXZlIHR5cGluZy4NCg0KSSBzb21ldGlt ZXMgcmVsb2FkIGxvY2FscyBhZnRlciBmdW5jdGlvbiBjYWxscy4NCg0KCURhdmlkDQoNCi0NClJl Z2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0 b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykN Cg==