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d="scan'208";a="13192463" Date: Thu, 20 Feb 2020 16:20:04 +0100 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: Jan Beulich Message-ID: <20200220152004.GN4679@Air-de-Roger> References: <20200220120231.86907-1-roger.pau@citrix.com> <20200220141117.GK4679@Air-de-Roger> <20200220143841.GL4679@Air-de-Roger> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: AMSPEX02CAS02.citrite.net (10.69.22.113) To AMSPEX02CL01.citrite.net (10.69.22.125) Subject: Re: [Xen-devel] [PATCH] 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 , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , 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" T24gVGh1LCBGZWIgMjAsIDIwMjAgYXQgMDQ6MTE6MDhQTSArMDEwMCwgSmFuIEJldWxpY2ggd3Jv dGU6Cj4gT24gMjAuMDIuMjAyMCAxNTozOCwgUm9nZXIgUGF1IE1vbm7DqSB3cm90ZToKPiA+IE9u IFRodSwgRmViIDIwLCAyMDIwIGF0IDAzOjIzOjM4UE0gKzAxMDAsIErDvHJnZW4gR3Jvw58gd3Jv dGU6Cj4gPj4gT24gMjAuMDIuMjAgMTU6MTEsIFJvZ2VyIFBhdSBNb25uw6kgd3JvdGU6Cj4gPj4+ IE9uIFRodSwgRmViIDIwLCAyMDIwIGF0IDAxOjQ4OjU0UE0gKzAxMDAsIEphbiBCZXVsaWNoIHdy b3RlOgo+ID4+Pj4gT24gMjAuMDIuMjAyMCAxMzowMiwgUm9nZXIgUGF1IE1vbm5lIHdyb3RlOgo+ ID4+Pj4+IEBAIC0xNjYsNyArMTgwLDggQEAgc3RhdGljIGlubGluZSB2b2lkIF93cml0ZV91bmxv Y2socndsb2NrX3QgKmxvY2spCj4gPj4+Pj4gICAgICAgICogSWYgdGhlIHdyaXRlciBmaWVsZCBp cyBhdG9taWMsIGl0IGNhbiBiZSBjbGVhcmVkIGRpcmVjdGx5Lgo+ID4+Pj4+ICAgICAgICAqIE90 aGVyd2lzZSwgYW4gYXRvbWljIHN1YnRyYWN0aW9uIHdpbGwgYmUgdXNlZCB0byBjbGVhciBpdC4K PiA+Pj4+PiAgICAgICAgKi8KPiA+Pj4+PiAtICAgIGF0b21pY19zdWIoX1FXX0xPQ0tFRCwgJmxv Y2stPmNudHMpOwo+ID4+Pj4+ICsgICAgQVNTRVJUKF9pc193cml0ZV9sb2NrZWRfYnlfbWUoYXRv bWljX3JlYWQoJmxvY2stPmNudHMpKSk7Cj4gPj4+Pj4gKyAgICBhdG9taWNfc3ViKF93cml0ZV9s b2NrX3ZhbCgpLCAmbG9jay0+Y250cyk7Cj4gPj4+Pgo+ID4+Pj4gSSB0aGluayB0aGlzIHdvdWxk IGJlIG1vcmUgZWZmaWNpZW50IHdpdGggYXRvbWljX2FuZCgpLCBub3QKPiA+Pj4+IHRoZSBsZWFz dCBiZWNhdXNlIG9mIHRoZSB0aGVuIGF2b2lkZWQgc21wX3Byb2Nlc3Nvcl9pZCgpLgo+ID4+Pj4g V2hldGhlciB0byBtYXNrIG9mZiBqdXN0IF9RV19XTUFTSyBvciBhbHNvIHRoZSBDUFUgbnVtYmVy IG9mCj4gPj4+PiB0aGUgbGFzdCB3cml0ZSBvd25lciB3b3VsZCBuZWVkIHRvIGJlIGRldGVybWlu ZWQuIEJ1dCB3aXRoCj4gPj4+PiB1c2luZyBzdWJ0cmFjdGlvbiwgaW4gY2FzZSBvZiBwcm9ibGVt cyBpdCdsbCBsaWtlbHkgYmUKPiA+Pj4+IGhhcmRlciB0byB1bmRlcnN0YW5kIHdoYXQgYWN0dWFs bHkgd2VudCBvbiwgZnJvbSBsb29raW5nIGF0Cj4gPj4+PiB0aGUgcmVzdWx0aW5nIHN0YXRlIG9m IHRoZSBsb2NrICh0aGlzIGlzIGluIHBhcnQgYSBwcmUtCj4gPj4+PiBleGlzdGluZyBwcm9ibGVt LCBidXQgZ2V0cyB3b3JzZSB3aXRoIHN1YnRyYWN0aW9uIG9mIENQVQo+ID4+Pj4gbnVtYmVycyku Cj4gPj4+Cj4gPj4+IFJpZ2h0LCBhIG1hc2sgd291bGQgYmUgYmV0dGVyLiBSaWdodCBub3cgYm90 aCBuZWVkIHRvIGJlIGNsZWFyZWQgKHRoZQo+ID4+PiBMT0NLRUQgYW5kIHRoZSBDUFUgZmllbGRz KSBhcyB0aGVyZSdzIGNvZGUgdGhhdCByZWxpZXMgb24gIWxvY2stPmNudHMKPiA+Pj4gYXMgYSB3 YXkgdG8gZGV0ZXJtaW5lIHRoYXQgdGhlIGxvY2sgaXMgbm90IHJlYWQgb3Igd3JpdGUgbG9ja2Vk LiBJZiB3ZQo+ID4+PiBsZWZ0IHRoZSBDUFUgbHlpbmcgYXJvdW5kIHRob3NlIGNoZWNrcyB3b3Vs ZCBuZWVkIHRvIGJlIGFkanVzdGVkLgo+ID4+Cj4gPj4gSW4gY2FzZSB5b3UgbWFrZSBfUVJfU0hJ RlQgMTYgaXQgaXMgcG9zc2libGUgdG8ganVzdCB3cml0ZSBhIDItYnl0ZSB6ZXJvCj4gPj4gdmFs dWUgZm9yIHdyaXRlX3VubG9jaygpIChsaWtlIGl0cyBwb3NzaWJsZSB0byBkbyBzbyB0b2RheSB1 c2luZyBhCj4gPj4gc2luZ2xlIGJ5dGUgd3JpdGUpLgo+ID4gCj4gPiBUaGF0IHdvdWxkIGxpbWl0 IHRoZSByZWFkZXJzIGNvdW50IHRvIDY1NTM2LCB3aGF0IGRvIHlvdSB0aGluayBKYW4/Cj4gCj4g SWYgdGhlIHJlY3Vyc2VfY3B1IGFwcHJvYWNoIGlzIGNvbnNpZGVyZWQgYmFkLCBJIHRoaW5rIHRo aXMgd291bGQKPiBiZSBhY2NlcHRhYmxlLiBCdXQgb2YgY291cnNlIHlvdSdsbCBuZWVkIHRvIGNv bnN1bHQgd2l0aCB0aGUgQXJtCj4gZ3V5cyByZWdhcmRpbmcgdGhlIGNvcnJlY3RuZXNzIG9mIHN1 Y2ggYSAiaGFsZiIgc3RvcmUgaW4gdGhlaXIKPiBtZW1vcnkgbW9kZWw7IEkgd291bGQgaG9wZSB0 aGlzIHRvIGJlIHVuaXZlcnNhbGx5IG9rYXksIGJ1dCBJJ20KPiBub3QgZW50aXJlbHkgY2VydGFp bi4KCkkgd291bGQgbGlrZSB0byBnZXQgY29uZmlybWF0aW9uIGZyb20gdGhlIEFybSBmb2xrcywg YnV0IEkgc2VlIEFybSBoYXMKd3JpdGVfYXRvbWljIGFuZCBzdXBwb3J0cyBzdWNoIG9wZXJhdGlv biBhZ2FpbnN0IGEgdWludDE2X3QsIHNvIEkKZG9uJ3Qgc2VlIHdoeSBpdCB3b3VsZG4ndCB3b3Jr LgoKVGhhbmtzLCBSb2dlci4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbnByb2pl Y3Qub3JnCmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvbWFpbG1hbi9saXN0aW5mby94ZW4t ZGV2ZWw=