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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:44904) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kuZBq-0005e6-5q; Wed, 30 Dec 2020 10:58:50 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1kuZBn-00028I-Qn; Wed, 30 Dec 2020 10:58:47 +0000 Date: Wed, 30 Dec 2020 10:58:47 +0000 From: Russell King - ARM Linux admin To: Nicholas Piggin Subject: Re: [RFC please help] membarrier: Rewrite sync_core_before_usermode() Message-ID: <20201230105847.GQ1551@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> <20201230100028.GP1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201230100028.GP1551@shell.armlinux.org.uk> 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_055923_772720_1E6AB2DF X-CRM114-Status: GOOD ( 29.20 ) 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: paulmck , Arnd Bergmann , Jann Horn , Peter Zijlstra , Catalin Marinas , x86 , linux-kernel , stable , Will Deacon , Mathieu Desnoyers , Michael Ellerman , Andy Lutomirski , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev , 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 T24gV2VkLCBEZWMgMzAsIDIwMjAgYXQgMTA6MDA6MjhBTSArMDAwMCwgUnVzc2VsbCBLaW5nIC0g QVJNIExpbnV4IGFkbWluIHdyb3RlOgo+IE9uIFdlZCwgRGVjIDMwLCAyMDIwIGF0IDEyOjMzOjAy UE0gKzEwMDAsIE5pY2hvbGFzIFBpZ2dpbiB3cm90ZToKPiA+IEV4Y2VycHRzIGZyb20gUnVzc2Vs bCBLaW5nIC0gQVJNIExpbnV4IGFkbWluJ3MgbWVzc2FnZSBvZiBEZWNlbWJlciAyOSwgMjAyMCA4 OjQ0IHBtOgo+ID4gPiBPbiBUdWUsIERlYyAyOSwgMjAyMCBhdCAwMTowOToxMlBNICsxMDAwLCBO aWNob2xhcyBQaWdnaW4gd3JvdGU6Cj4gPiA+PiBJIHRoaW5rIGl0IHNob3VsZCBjZXJ0YWlubHkg YmUgZG9jdW1lbnRlZCBpbiB0ZXJtcyBvZiB3aGF0IGd1YXJhbnRlZXMKPiA+ID4+IGl0IHByb3Zp ZGVzIHRvIGFwcGxpY2F0aW9uLCBfbm90XyB0aGUga2luZHMgb2YgaW5zdHJ1Y3Rpb25zIGl0IG1h eSBvcgo+ID4gPj4gbWF5IG5vdCBpbmR1Y2UgdGhlIGNvcmUgdG8gZXhlY3V0ZS4gQW5kIGlmIGV4 aXN0aW5nIEFQSSBjYW4ndCBiZQo+ID4gPj4gcmUtZG9jdW1lbnRlZCBzYW5lbHksIHRoZW4gZGVw cmVjYXRkIGFuZCBuZXcgb25lcyBhZGRlZCB0aGF0IERUUlQuCj4gPiA+PiBQb3NzaWJseSB1bmRl ciBhIG5ldyBzeXN0ZW0gY2FsbCwgaWYgYXJjaCdzIGxpa2UgQVJNIHdhbnQgYSByYW5nZQo+ID4g Pj4gZmx1c2ggYW5kIHdlIGRvbid0IHdhbnQgdG8gZXhwYW5kIHRoZSBtdWx0aXBsZXhpbmcgYmVo YXZpb3VyIG9mCj4gPiA+PiBtZW1iYXJyaWVyIGV2ZW4gbW9yZSAoc2lnaCkuCj4gPiA+IAo+ID4g PiBUaGUgMzItYml0IEFSTSBzeXNfY2FjaGVmbHVzaCgpIGlzIHRoZXJlIG9ubHkgdG8gc3VwcG9y dCBzZWxmLW1vZGlmeWluZwo+ID4gPiBjb2RlLCBhbmQgdGFrZXMgd2hhdGV2ZXIgYWN0aW9ucyBh cmUgbmVjZXNzYXJ5IHRvIHN1cHBvcnQgdGhhdC4KPiA+ID4gRXhhY3RseSB3aGF0IGFjdGlvbnMg aXQgdGFrZXMgYXJlIGNhY2hlIGltcGxlbWVudGF0aW9uIHNwZWNpZmljLCBhbmQKPiA+ID4gc2hv dWxkIGJlIG9mIG5vIGNvbmNlcm4gdG8gdGhlIGNhbGxlciwgYnV0IHRoZSB1bmRlcmx5aW5nIHRo aW5nIGlzLi4uCj4gPiA+IGl0J3MgdG8gc3VwcG9ydCBzZWxmLW1vZGlmeWluZyBjb2RlLgo+ID4g Cj4gPiAgICBDYXZlYXQKPiA+ICAgICAgICBjYWNoZWZsdXNoKCkgIHNob3VsZCAgbm90ICBiZSB1 c2VkIGluIHByb2dyYW1zIGludGVuZGVkIHRvIGJlIHBvcnRhYmxlLgo+ID4gICAgICAgIE9uIExp bnV4LCB0aGlzIGNhbGwgZmlyc3QgYXBwZWFyZWQgb24gdGhlIE1JUFMgYXJjaGl0ZWN0dXJlLCBi dXQgIG5vd2HigJAKPiA+ICAgICAgICBkYXlzLCBMaW51eCBwcm92aWRlcyBhIGNhY2hlZmx1c2go KSBzeXN0ZW0gY2FsbCBvbiBzb21lIG90aGVyIGFyY2hpdGVj4oCQCj4gPiAgICAgICAgdHVyZXMs IGJ1dCB3aXRoIGRpZmZlcmVudCBhcmd1bWVudHMuCj4gPiAKPiA+IFdoYXQgYSBkaXNhc3Rlci4g QW5vdGhlciBiYWRseSBkZXNpZ25lZCBpbnRlcmZhY2UsIGFsdGhvdWdoIGl0IGRpZG4ndCAKPiA+ IG9yaWdpbmF0ZSBpbiBMaW51eCBpdCBzb3VuZHMgbGlrZSB3ZSB3ZXJlbid0IHRvIGJlIG91dGRv bmUgc28KPiA+IHdlIG1lc3NlZCBpdCB1cCBldmVuIHdvcnNlLgo+ID4gCj4gPiBmbHVzaGluZyBj YWNoZXMgaXMgbmVpdGhlciBuZWNlc3Nhcnkgbm9yIHN1ZmZpY2llbnQgZm9yIGNvZGUgbW9kaWZp Y2F0aW9uCj4gPiBvbiBtYW55IHByb2Nlc3NvcnMuIE1heWJlIHNvbWUgb2xkIE1JUFMgc3BlY2lm aWMgcHJpdmF0ZSB0aGluZyB3YXMgZmluZSwKPiA+IGJ1dCBjZXJ0YWlubHkgYmVmb3JlIGl0IGdy ZXcgdG8gb3RoZXIgYXJjaGl0ZWN0dXJlcywgc29tZWJvZHkgc2hvdWxkIAo+ID4gaGF2ZSB0aG91 Z2h0IGZvciBtb3JlIHRoYW4gMiBtaW51dGVzIGFib3V0IGl0LiBTaWdoLgo+IAo+IFdBUk5JTkc6 IFlvdSBhcmUgYm9yZGVyaW5nIG9uIGJlaW5nIG9iamVjdGlvbmFibGUgYW5kIG9mZmVuc2l2ZSB3 aXRoCj4gdGhhdCBjb21tZW50Lgo+IAo+IFRoZSBBUk0gaW50ZXJmYWNlIHdhcyBkZXNpZ25lZCBi eSBtZSBiYWNrIGluIHRoZSB2ZXJ5IGVhcmx5IGRheXMgb2YKPiBMaW51eCwgcHJvYmFibHkgd2hp bGUgeW91IHdlcmUgc3RpbGwgaW4gZHlwZXJzLCBiYXNlZCBvbiB3aGF0IHdhcwo+IGtub3duIGF0 IHRoZSB0aW1lLiAgQmFjayBpbiB0aGUgZWFybHkgMjAwMHMsIGlkZWFzIHN1Y2ggYXMgcmVsYXhl ZAo+IG1lbW9yeSBvcmRlcmluZyB3ZXJlIG5vdCBrbm93bi4gIEFsbCB0aGVyZSB3YXMgd2FzIG9u ZSBsZXZlbCBvZgo+IGhhcnZhcmQgY2FjaGUuCgpTb3JyeSwgSSBnb3QgdGhhdCBzbGlnaHRseSB3 cm9uZy4gSXRzIG9yaWdpbnMgb24gQVJNIHdlcmUgZnJvbSAxMiBEZWMKMTk5ODoKCmh0dHA6Ly93 d3cuYXJtbGludXgub3JnLnVrL2RldmVsb3Blci9wYXRjaGVzL3ZpZXdwYXRjaC5waHA/aWQ9ODgv MQoKYnkgUGhpbGlwIEJsdW5kZWxsLCBhbmQgZmlyc3QgYXBwZWFyZWQgaW4gdGhlIEFSTQpwcmUt cGF0Y2gtMi4xLjEzMS0xOTk4MTIxNC0xLmd6LiBJdCB3YXMgc3Vic2VxdWVudGx5IGRvY3VtZW50 ZWQgaW4gdGhlCmtlcm5lbCBzb3VyY2VzIGJ5IG1lIGluIEp1bHkgMjAwMSBpbiBBUk0gcGF0Y2gt Mi40LjYtcm1rMi5nei4gSXQgaGFzCmEgc2xpZ2h0bHkgZGlmZmVyZW50IHNpZ25hdHVyZTogdGhl IHRoaXJkIGFyZ3VtZW50IG9uIEFSTSBpcyBhIGZsYWdzCmFyZ3VtZW50LCB3aGVyZWFzIHRoZSBN SVBTIGNvZGUsIGl0IGlzIHNvbWUgdW5kb2N1bWVudGVkICJjYWNoZSIKcGFyYW1ldGVyLgoKV2hl dGhlciB0aGUgQVJNIHZlcnNpb24gcHJlIG9yIHBvc3QgZGF0ZXMgdGhlIE1JUFMgY29kZSwgSSBj b3VsZG4ndCBzYXkuCldoZXRoZXIgaXQgd2FzIHVsdGltYXRlbHkgdGFrZW4gZnJvbSB0aGUgTUlQ UyBpbXBsZW1lbnRhdGlvbiwgYWdhaW4sIEkKY291bGRuJ3Qgc2F5LgoKSG93ZXZlciwgcGxlYXNl IHN0b3AgaW5zdWx0aW5nIHlvdXIgZmVsbG93IGRldmVsb3BlcnMgYWJpbGl0eSB0byB0aGluay4K Ci0tIApSTUsncyBQYXRjaCBzeXN0ZW06IGh0dHBzOi8vd3d3LmFybWxpbnV4Lm9yZy51ay9kZXZl bG9wZXIvcGF0Y2hlcy8KRlRUUCBpcyBoZXJlISA0ME1icHMgZG93biAxME1icHMgdXAuIERlY2Vu dCBjb25uZWN0aXZpdHkgYXQgbGFzdCEKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1r ZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK