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d="scan'208";a="12810283" Date: Fri, 21 Feb 2020 10:10:05 +0100 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: Julien Grall Message-ID: <20200221091005.GT4679@Air-de-Roger> References: <20200220173116.88915-1-roger.pau@citrix.com> <83d48223-21eb-be54-985c-085449661892@xen.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <83d48223-21eb-be54-985c-085449661892@xen.org> X-ClientProxiedBy: AMSPEX02CAS01.citrite.net (10.69.22.112) To AMSPEX02CL01.citrite.net (10.69.22.125) Subject: Re: [Xen-devel] [PATCH v2] rwlock: allow recursive read locking when already locked in write mode X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?B?SsO8cmdlbiBHcm/Dnw==?= , Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Jan Beulich , xen-devel@lists.xenproject.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gVGh1LCBGZWIgMjAsIDIwMjAgYXQgMDc6MjA6MDZQTSArMDAwMCwgSnVsaWVuIEdyYWxsIHdy b3RlOgo+IEhpLAo+IAo+IE9uIDIwLzAyLzIwMjAgMTc6MzEsIFJvZ2VyIFBhdSBNb25uZSB3cm90 ZToKPiA+IEFsbG93IGEgQ1BVIGFscmVhZHkgaG9sZGluZyB0aGUgbG9jayBpbiB3cml0ZSBtb2Rl IHRvIGFsc28gbG9jayBpdCBpbgo+ID4gcmVhZCBtb2RlLiBUaGVyZSdzIG5vIGhhcm0gaW4gYWxs b3dpbmcgcmVhZCBsb2NraW5nIGEgcndsb2NrIHRoYXQncwo+ID4gYWxyZWFkeSBvd25lZCBieSB0 aGUgY2FsbGVyIChpZTogQ1BVKSBpbiB3cml0ZSBtb2RlLiBBbGxvd2luZyBzdWNoCj4gPiBhY2Nl c3NlcyBpcyByZXF1aXJlZCBhdCBsZWFzdCBmb3IgdGhlIENQVSBtYXBzIHVzZS1jYXNlLgo+ID4g Cj4gPiBJbiBvcmRlciB0byBkbyB0aGlzIHJlc2VydmUgMTRiaXRzIG9mIHRoZSBsb2NrLCB0aGlz IGFsbG93cyB0byBzdXBwb3J0Cj4gPiB1cCB0byAxNjM4NCBDUFVzLiBBbHNvIHJlZHVjZSB0aGUg d3JpdGUgbG9jayBtYXNrIHRvIDIgYml0czogb25lIHRvCj4gPiBzaWduYWwgdGhlcmUgYXJlIHBl bmRpbmcgd3JpdGVycyB3YWl0aW5nIG9uIHRoZSBsb2NrIGFuZCB0aGUgb3RoZXIgdG8KPiA+IHNp Z25hbCB0aGUgbG9jayBpcyBvd25lZCBpbiB3cml0ZSBtb2RlLiBOb3RlIHRoZSB3cml0ZSByZWxh dGVkIGRhdGEKPiA+IGlzIHVzaW5nIDE2Yml0cywgdGhpcyBpcyBkb25lIGluIG9yZGVyIHRvIGJl IGFibGUgdG8gY2xlYXIgaXQgKGFuZAo+ID4gdGh1cyByZWxlYXNlIHRoZSBsb2NrKSB1c2luZyBh IDE2Yml0IGF0b21pYyB3cml0ZS4KPiA+IAo+ID4gVGhpcyByZWR1Y2VzIHRoZSBtYXhpbXVtIG51 bWJlciBvZiBjb25jdXJyZW50IHJlYWRlcnMgZnJvbSAxNjc3NzIxNiB0bwo+ID4gNjU1MzYsIEkg dGhpbmsgdGhpcyBzaG91bGQgc3RpbGwgYmUgZW5vdWdoLCBvciBlbHNlIHRoZSBsb2NrIGZpZWxk Cj4gPiBjYW4gYmUgZXhwYW5kZWQgZnJvbSAzMiB0byA2NGJpdHMgaWYgYWxsIGFyY2hpdGVjdHVy ZXMgc3VwcG9ydCBhdG9taWMKPiA+IG9wZXJhdGlvbnMgb24gNjRiaXQgaW50ZWdlcnMuCj4gCj4g RldJVywgYXJtMzIgaXMgYWJsZSB0byBzdXBwb3J0IGF0b21pYyBvcGVyYXRpb25zIG9uIDY0LWJp dCBpbnRlZ2Vycy4KPiAKPiA+ICAgc3RhdGljIGlubGluZSB2b2lkIF93cml0ZV91bmxvY2socnds b2NrX3QgKmxvY2spCj4gPiAgIHsKPiA+IC0gICAgLyoKPiA+IC0gICAgICogSWYgdGhlIHdyaXRl ciBmaWVsZCBpcyBhdG9taWMsIGl0IGNhbiBiZSBjbGVhcmVkIGRpcmVjdGx5Lgo+ID4gLSAgICAg KiBPdGhlcndpc2UsIGFuIGF0b21pYyBzdWJ0cmFjdGlvbiB3aWxsIGJlIHVzZWQgdG8gY2xlYXIg aXQuCj4gPiAtICAgICAqLwo+ID4gLSAgICBhdG9taWNfc3ViKF9RV19MT0NLRUQsICZsb2NrLT5j bnRzKTsKPiA+ICsgICAgLyogU2luY2UgdGhlIHdyaXRlciBmaWVsZCBpcyBhdG9taWMsIGl0IGNh biBiZSBjbGVhcmVkIGRpcmVjdGx5LiAqLwo+ID4gKyAgICBBU1NFUlQoX2lzX3dyaXRlX2xvY2tl ZF9ieV9tZShhdG9taWNfcmVhZCgmbG9jay0+Y250cykpKTsKPiA+ICsgICAgQlVJTERfQlVHX09O KF9RUl9TSElGVCAhPSAxNik7Cj4gPiArICAgIHdyaXRlX2F0b21pYygodWludDE2X3QgKikmbG9j ay0+Y250cywgMCk7Cj4gCj4gSSB0aGluayB0aGlzIGlzIGFuIGFidXNlIHRvIGNhc3QgYW4gYXRv bWljX3QoKSBkaXJlY3RseSBpbnRvIGEgdWludDE2X3QuIFlvdQo+IHdvdWxkIGF0IGxlYXN0IHdh bnQgdG8gdXNlICZsb2NrLT5jbnRzLmNvdW50ZXIgaGVyZS4KClN1cmUsIEkgd2FzIHdvbmRlcmlu ZyBhYm91dCB0aGlzIG15c2VsZi4KCldpbGwgd2FpdCBmb3IgbW9yZSBjb21tZW50cywgbm90IHN1 cmUgd2hldGhlciB0aGlzIGNhbiBiZSBmaXhlZCB1cG9uCmNvbW1pdCBpZiB0aGVyZSBhcmUgbm8g b3RoZXIgaXNzdWVzLgoKVGhhbmtzLCBSb2dlci4KCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxp c3RzLnhlbnByb2plY3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9s aXN0aW5mby94ZW4tZGV2ZWw=