From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f71.google.com (mail-oi0-f71.google.com [209.85.218.71]) by kanga.kvack.org (Postfix) with ESMTP id 25F258E0001 for ; Wed, 12 Sep 2018 10:40:38 -0400 (EDT) Received: by mail-oi0-f71.google.com with SMTP id l14-v6so2536055oii.9 for ; Wed, 12 Sep 2018 07:40:38 -0700 (PDT) Received: from NAM05-BY2-obe.outbound.protection.outlook.com (mail-by2nam05on0700.outbound.protection.outlook.com. [2a01:111:f400:fe52::700]) by mx.google.com with ESMTPS id h124-v6si797793oic.303.2018.09.12.07.40.36 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 12 Sep 2018 07:40:36 -0700 (PDT) From: Pasha Tatashin Subject: Re: [PATCH] memory_hotplug: fix the panic when memory end is not on the section boundary Date: Wed, 12 Sep 2018 14:40:18 +0000 Message-ID: <38ce1d0b-14bd-9a4a-1061-62c366cb11b5@microsoft.com> References: <20180910123527.71209-1-zaslonko@linux.ibm.com> <20180910131754.GG10951@dhcp22.suse.cz> <20180912150356.642c1dab@thinkpad> <20180912133933.GI10951@dhcp22.suse.cz> <20180912162717.5a018bf6@thinkpad> In-Reply-To: <20180912162717.5a018bf6@thinkpad> Content-Language: en-US Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Gerald Schaefer , Michal Hocko Cc: Mikhail Zaslonko , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "osalvador@suse.de" DQoNCk9uIDkvMTIvMTggMTA6MjcgQU0sIEdlcmFsZCBTY2hhZWZlciB3cm90ZToNCj4gT24gV2Vk LCAxMiBTZXAgMjAxOCAxNTozOTozMyArMDIwMA0KPiBNaWNoYWwgSG9ja28gPG1ob2Nrb0BrZXJu ZWwub3JnPiB3cm90ZToNCj4gDQo+PiBPbiBXZWQgMTItMDktMTggMTU6MDM6NTYsIEdlcmFsZCBT Y2hhZWZlciB3cm90ZToNCj4+IFsuLi5dDQo+Pj4gQlRXLCB0aG9zZSBzeXNmcyBhdHRyaWJ1dGVz IGFyZSB3b3JsZC1yZWFkYWJsZSwgc28gYW55b25lIGNhbiB0cmlnZ2VyDQo+Pj4gdGhlIHBhbmlj IGJ5IHNpbXBseSByZWFkaW5nIHRoZW0sIG9yIGp1c3QgcnVuIGxzbWVtIChhbHNvIGF2YWlsYWJs ZSBmb3INCj4+PiB4ODYgc2luY2UgdXRpbC1saW51eCAyLjMyKS4gT0ssIHlvdSBuZWVkIGEgc3Bl Y2lhbCBub3QtbWVtb3J5LWJsb2NrLWFsaWduZWQNCj4+PiBtZW09IHBhcmFtZXRlciBhbmQgREVC VUdfVk0gZm9yIHBvaXNvbiBjaGVjaywgYnV0IHcvbyBERUJVR19WTSB5b3Ugd291bGQNCj4+PiBz dGlsbCBhY2Nlc3MgdW5pbml0aWFsaXplZCBzdHJ1Y3QgcGFnZXMuIFRoaXMgc291bmRzIHZlcnkg d3JvbmcsIGFuZCBJDQo+Pj4gdGhpbmsgaXQgcmVhbGx5IHNob3VsZCBiZSBmaXhlZC4gIA0KPj4N Cj4+IE9oaCwgYWJzb2x1dGVseS4gTm9ib2R5IGlzIHF1ZXN0aW9uaW5nIHRoYXQuIFRoZSB0aGlu ZyBpcyB0aGF0IHRoZQ0KPj4gY29kZSBoYXMgYmVlbiBsaWtlbHkgYWx3YXlzIGJyb2tlbi4gV2Ug anVzdCBoYXZlbid0IG5vdGljZWQgYmVjYXVzZQ0KPj4gdGhvc2UgdW5pdGlhbGl6ZWQgcGFydHMg d2hlcmUgemVyb2VkIHByZXZpb3VzbHkuIE5vdyB0aGF0IHRoZSBpbXBsaWNpdA0KPj4gemVyb3lp bmcgaXMgZ29uZSBpdCBpcyBqdXN0IHZpc2libGUuDQo+Pg0KPj4gQWxsIHRoYXQgSSBhbSBhcmd1 aW5nIGlzIHRoYXQgdGhlcmUgYXJlIG1hbnkgcGxhY2VzIHdoaWNoIGFzc3VtZQ0KPj4gcGFnZWJs b2NrcyB0byBiZSBmdWxseSBpbml0aWFsaXplZCBhbmQgcGx1Z2dpbmcgb25lIHBsYWNlIHRoYXQg Ymxvd3MgdXANCj4+IGF0IHRoZSB0aW1lIGlzIGp1c3Qgd2hhY2sgYSBtb2xlLiBXZSBuZWVkIHRv IGFkZHJlc3MgdGhpcyBtdWNoIGVhcmxpZXIuDQo+PiBFLmcuIGJ5IGFsbG93aW5nIG9ubHkgZnVs bCBwYWdlYmxvY2tzIHdoZW4gYWRkaW5nIGEgbWVtb3J5IHJhbmdlLg0KPiANCj4gSnVzdCB0byBt YWtlIHN1cmUgd2UgYXJlIHRhbGtpbmcgYWJvdXQgdGhlIHNhbWUgdGhpbmc6IHdoZW4geW91IHNh eQ0KPiAicGFnZWJsb2NrcyIsIGRvIHlvdSBtZWFuIHRoZSBNQVhfT1JERVJfTlJfUEFHRVMgLyBw YWdlYmxvY2tfbnJfcGFnZXMNCj4gdW5pdCBvZiBwYWdlcywgb3IgZG8geW91IG1lYW4gdGhlIG1l bW9yeSAoaG90cGx1ZykgYmxvY2sgdW5pdD8NCg0KRnJvbSBlYXJseSBkaXNjdXNzaW9uLCBpdCB3 YXMgYWJvdXQgcGFnZWJsb2NrX25yX3BhZ2VzIG5vdCBhYm91dA0KbWVtb3J5X2Jsb2NrX3NpemVf Ynl0ZXMNCg0KPiANCj4gSSBkbyBub3Qgc2VlIGFueSBpc3N1ZSBoZXJlIHdpdGggTUFYX09SREVS X05SX1BBR0VTIC8gcGFnZWJsb2NrX25yX3BhZ2VzDQo+IHBhZ2VibG9ja3MsIGFuZCBpZiB0aGVy ZSB3YXMgc3VjaCBhbiBpc3N1ZSwgb2YgY291cnNlIHlvdSBhcmUgcmlnaHQgdGhhdA0KPiB0aGlz IHdvdWxkIGFmZmVjdCBtYW55IHBsYWNlcy4gSWYgdGhlcmUgd2FzIHN1Y2ggYW4gaXNzdWUsIEkg d291bGQgYWxzbw0KPiBhc3N1bWUgdGhhdCB3ZSB3b3VsZCBzZWUgdGhlIG5ldyBwYWdlIHBvaXNv biB3YXJuaW5nIGluIG1hbnkgb3RoZXIgcGxhY2VzLg0KPiANCj4gVGhlIGJ1ZyB0aGF0IE1pa2hh aWxzIHBhdGNoIHdvdWxkIGZpeCBvbmx5IGFmZmVjdHMgY29kZSB0aGF0IG9wZXJhdGVzDQo+IG9u IC8gaXRlcmF0ZXMgdGhyb3VnaCBtZW1vcnkgKGhvdHBsdWcpIGJsb2NrcywgYW5kIHRoYXQgZG9l cyBub3QgaGFwcGVuDQo+IGluIG1hbnkgcGxhY2VzLCBvbmx5IGluIHRoZSB0d28gZnVuY3Rpb25z IHRoYXQgaGlzIHBhdGNoIGZpeGVzLg0KDQpKdXN0IHRvIGJlIGNsZWFyLCBzbyBtZW1vcnkgaXMg cGFnZWJsb2NrX25yX3BhZ2VzIGFsaWduZWQsIHlldA0KbWVtb3J5X2Jsb2NrIGFyZSBsYXJnZXIg YW5kIHBhbmljIGlzIHN0aWxsIHRyaWdnZXJlZD8NCg0KSSBhc2ssIGJlY2F1c2UgMzA3NU0gaXMg bm90IDEyOE0gYWxpZ25lZC4NCg0KPiANCj4gV2hlbiB5b3Ugc2F5ICJhZGRyZXNzIHRoaXMgbXVj aCBlYXJsaWVyIiwgZG8geW91IG1lYW4gY2hhbmdpbmcgdGhlIHdheQ0KPiB0aGF0IGZyZWVfYXJl YV9pbml0X2NvcmUoKS9tZW1tYXBfaW5pdCgpIGluaXRpYWxpemUgc3RydWN0IHBhZ2VzLCBpLmUu DQo+IGhhdmUgdGhlbSBub3QgdXNlIHpvbmUtPnNwYW5uZWRfcGFnZXMgYXMgbGltaXQsIGJ1dCBy YXRoZXIgYWxpZ24gdGhhdA0KPiB1cCB0byB0aGUgbWVtb3J5IGJsb2NrIChub3QgcGFnZWJsb2Nr KSBib3VuZGFyeT8NCj4gDQoNClRoaXMgd2FzIG15IGluaXRpYWwgcHJvcG9zYWwsIHRvIGZpeCBt ZW1tYXBfaW5pdCgpIGFuZCBpbml0aWFsaXplIHN0cnVjdA0KcGFnZXMgYmV5b25kIHRoZSAiZW5k IiwgYW5kIGJlZm9yZSB0aGUgInN0YXJ0IiB0byBjb3ZlciB0aGUgd2hvbGUNCnNlY3Rpb24uIEJ1 dCwgSSB0aGluayBNaWNoYWwgc3VnZ2VzdGVkIChhbmQgaGUgbWlnaHQgY29ycmVjdCBtZSkgdG8N CnNpbXBseSBpZ25vcmUgdW5hbGlnbmVkIG1lbW9yeSB0byBzZWN0aW9uIG1lbW9yeSBtdWNoIGVh cmxpZXI6IHNvDQphbnl0aGluZyB0aGF0IGRvZXMgbm90IGFsaWduIHRvIHNwYXJzZSBvcmRlciBp cyBub3QgYWRkZWQgYXQgYWxsIHRvIHRoZQ0Kc3lzdGVtLg0KDQpJIHRoaW5rIE1pY2hhbCdzIHBy b3Bvc2FsIHdvdWxkIHNpbXBsaWZ5IGFuZCBzdHJlbmd0aGVuIG1lbW9yeSBtYXBwaW5nDQpvdmVy YWxsLg0KDQpQYXZlbA==