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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:44902) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kuYHP-0005bt-HE; Wed, 30 Dec 2020 10:00:31 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1kuYHM-00026D-M2; Wed, 30 Dec 2020 10:00:28 +0000 Date: Wed, 30 Dec 2020 10:00:28 +0000 From: Russell King - ARM Linux admin To: Nicholas Piggin Subject: Re: [RFC please help] membarrier: Rewrite sync_core_before_usermode() Message-ID: <20201230100028.GP1551@shell.armlinux.org.uk> References: <20201228190852.GI1551@shell.armlinux.org.uk> <1086654515.3607.1609187556216.JavaMail.zimbra@efficios.com> <1609200902.me5niwm2t6.astroid@bobo.none> <1609210162.4d8dqilke6.astroid@bobo.none> <20201229104456.GK1551@shell.armlinux.org.uk> <1609290821.wrfh89v23a.astroid@bobo.none> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1609290821.wrfh89v23a.astroid@bobo.none> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201230_050051_716585_4466260C X-CRM114-Status: GOOD ( 22.17 ) 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: linuxppc-dev , Catalin Marinas , paulmck , Arnd Bergmann , Jann Horn , Peter Zijlstra , Benjamin Herrenschmidt , x86 , linux-kernel , stable , Mathieu Desnoyers , Andy Lutomirski , Michael Ellerman , Paul Mackerras , Will Deacon , linux-arm-kernel Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBEZWMgMzAsIDIwMjAgYXQgMTI6MzM6MDJQTSArMTAwMCwgTmljaG9sYXMgUGlnZ2lu IHdyb3RlOgo+IEV4Y2VycHRzIGZyb20gUnVzc2VsbCBLaW5nIC0gQVJNIExpbnV4IGFkbWluJ3Mg bWVzc2FnZSBvZiBEZWNlbWJlciAyOSwgMjAyMCA4OjQ0IHBtOgo+ID4gT24gVHVlLCBEZWMgMjks IDIwMjAgYXQgMDE6MDk6MTJQTSArMTAwMCwgTmljaG9sYXMgUGlnZ2luIHdyb3RlOgo+ID4+IEkg dGhpbmsgaXQgc2hvdWxkIGNlcnRhaW5seSBiZSBkb2N1bWVudGVkIGluIHRlcm1zIG9mIHdoYXQg Z3VhcmFudGVlcwo+ID4+IGl0IHByb3ZpZGVzIHRvIGFwcGxpY2F0aW9uLCBfbm90XyB0aGUga2lu ZHMgb2YgaW5zdHJ1Y3Rpb25zIGl0IG1heSBvcgo+ID4+IG1heSBub3QgaW5kdWNlIHRoZSBjb3Jl IHRvIGV4ZWN1dGUuIEFuZCBpZiBleGlzdGluZyBBUEkgY2FuJ3QgYmUKPiA+PiByZS1kb2N1bWVu dGVkIHNhbmVseSwgdGhlbiBkZXByZWNhdGQgYW5kIG5ldyBvbmVzIGFkZGVkIHRoYXQgRFRSVC4K PiA+PiBQb3NzaWJseSB1bmRlciBhIG5ldyBzeXN0ZW0gY2FsbCwgaWYgYXJjaCdzIGxpa2UgQVJN IHdhbnQgYSByYW5nZQo+ID4+IGZsdXNoIGFuZCB3ZSBkb24ndCB3YW50IHRvIGV4cGFuZCB0aGUg bXVsdGlwbGV4aW5nIGJlaGF2aW91ciBvZgo+ID4+IG1lbWJhcnJpZXIgZXZlbiBtb3JlIChzaWdo KS4KPiA+IAo+ID4gVGhlIDMyLWJpdCBBUk0gc3lzX2NhY2hlZmx1c2goKSBpcyB0aGVyZSBvbmx5 IHRvIHN1cHBvcnQgc2VsZi1tb2RpZnlpbmcKPiA+IGNvZGUsIGFuZCB0YWtlcyB3aGF0ZXZlciBh Y3Rpb25zIGFyZSBuZWNlc3NhcnkgdG8gc3VwcG9ydCB0aGF0Lgo+ID4gRXhhY3RseSB3aGF0IGFj dGlvbnMgaXQgdGFrZXMgYXJlIGNhY2hlIGltcGxlbWVudGF0aW9uIHNwZWNpZmljLCBhbmQKPiA+ IHNob3VsZCBiZSBvZiBubyBjb25jZXJuIHRvIHRoZSBjYWxsZXIsIGJ1dCB0aGUgdW5kZXJseWlu ZyB0aGluZyBpcy4uLgo+ID4gaXQncyB0byBzdXBwb3J0IHNlbGYtbW9kaWZ5aW5nIGNvZGUuCj4g Cj4gICAgQ2F2ZWF0Cj4gICAgICAgIGNhY2hlZmx1c2goKSAgc2hvdWxkICBub3QgIGJlIHVzZWQg aW4gcHJvZ3JhbXMgaW50ZW5kZWQgdG8gYmUgcG9ydGFibGUuCj4gICAgICAgIE9uIExpbnV4LCB0 aGlzIGNhbGwgZmlyc3QgYXBwZWFyZWQgb24gdGhlIE1JUFMgYXJjaGl0ZWN0dXJlLCBidXQgIG5v d2HigJAKPiAgICAgICAgZGF5cywgTGludXggcHJvdmlkZXMgYSBjYWNoZWZsdXNoKCkgc3lzdGVt IGNhbGwgb24gc29tZSBvdGhlciBhcmNoaXRlY+KAkAo+ICAgICAgICB0dXJlcywgYnV0IHdpdGgg ZGlmZmVyZW50IGFyZ3VtZW50cy4KPiAKPiBXaGF0IGEgZGlzYXN0ZXIuIEFub3RoZXIgYmFkbHkg ZGVzaWduZWQgaW50ZXJmYWNlLCBhbHRob3VnaCBpdCBkaWRuJ3QgCj4gb3JpZ2luYXRlIGluIExp bnV4IGl0IHNvdW5kcyBsaWtlIHdlIHdlcmVuJ3QgdG8gYmUgb3V0ZG9uZSBzbwo+IHdlIG1lc3Nl ZCBpdCB1cCBldmVuIHdvcnNlLgo+IAo+IGZsdXNoaW5nIGNhY2hlcyBpcyBuZWl0aGVyIG5lY2Vz c2FyeSBub3Igc3VmZmljaWVudCBmb3IgY29kZSBtb2RpZmljYXRpb24KPiBvbiBtYW55IHByb2Nl c3NvcnMuIE1heWJlIHNvbWUgb2xkIE1JUFMgc3BlY2lmaWMgcHJpdmF0ZSB0aGluZyB3YXMgZmlu ZSwKPiBidXQgY2VydGFpbmx5IGJlZm9yZSBpdCBncmV3IHRvIG90aGVyIGFyY2hpdGVjdHVyZXMs IHNvbWVib2R5IHNob3VsZCAKPiBoYXZlIHRob3VnaHQgZm9yIG1vcmUgdGhhbiAyIG1pbnV0ZXMg YWJvdXQgaXQuIFNpZ2guCgpXQVJOSU5HOiBZb3UgYXJlIGJvcmRlcmluZyBvbiBiZWluZyBvYmpl Y3Rpb25hYmxlIGFuZCBvZmZlbnNpdmUgd2l0aAp0aGF0IGNvbW1lbnQuCgpUaGUgQVJNIGludGVy ZmFjZSB3YXMgZGVzaWduZWQgYnkgbWUgYmFjayBpbiB0aGUgdmVyeSBlYXJseSBkYXlzIG9mCkxp bnV4LCBwcm9iYWJseSB3aGlsZSB5b3Ugd2VyZSBzdGlsbCBpbiBkeXBlcnMsIGJhc2VkIG9uIHdo YXQgd2FzCmtub3duIGF0IHRoZSB0aW1lLiAgQmFjayBpbiB0aGUgZWFybHkgMjAwMHMsIGlkZWFz IHN1Y2ggYXMgcmVsYXhlZAptZW1vcnkgb3JkZXJpbmcgd2VyZSBub3Qga25vd24uICBBbGwgdGhl cmUgd2FzIHdhcyBvbmUgbGV2ZWwgb2YKaGFydmFyZCBjYWNoZS4KClNvLCBqdXRzIHNodXQgdXAg d2l0aCB5b3VyIGluc3VsdHMuCgotLSAKUk1LJ3MgUGF0Y2ggc3lzdGVtOiBodHRwczovL3d3dy5h cm1saW51eC5vcmcudWsvZGV2ZWxvcGVyL3BhdGNoZXMvCkZUVFAgaXMgaGVyZSEgNDBNYnBzIGRv d24gMTBNYnBzIHVwLiBEZWNlbnQgY29ubmVjdGl2aXR5IGF0IGxhc3QhCgpfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxp bmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3Rz LmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==