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Fri, 8 Mar 2019 10:03:42 +0800 (CST) Received: from BC-Mail-Ex14.internal.baidu.com (172.31.40.50) by M1-MAIL-EX11.internal.baidu.com (10.44.89.51) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1531.3; Fri, 8 Mar 2019 10:03:44 +0800 Received: from BC-Mail-Ex13.internal.baidu.com (172.31.40.49) by BC-Mail-Ex14.internal.baidu.com (172.31.40.50) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1531.3; Fri, 8 Mar 2019 10:03:43 +0800 Received: from BC-Mail-Ex13.internal.baidu.com ([172.31.40.49]) by Bc-Mail-Ex13.internal.baidu.com ([172.31.40.49]) with mapi id 15.01.1531.010; Fri, 8 Mar 2019 10:03:43 +0800 From: "Li,Rongqing" To: Andrew Morton CC: "linux-kernel@vger.kernel.org" , "Davidlohr Bueso" , Dominik Brodowski , Manfred Spraul , Arnd Bergmann Subject: =?gb2312?B?tPC4tDogW1BBVENIXSBpcGM6IHByZXZlbnQgbG9ja3VwIG9uIGFsbG9jX21z?= =?gb2312?Q?g_and_free=5Fmsg?= Thread-Topic: [PATCH] ipc: prevent lockup on alloc_msg and free_msg Thread-Index: AQHU1RED+JJ/26G40kaCEpraSHsZDaYA+3zQ Date: Fri, 8 Mar 2019 02:03:43 +0000 Message-ID: References: <1551946222-25470-1-git-send-email-lirongqing@baidu.com> <20190307101010.919d18394ae43ecf9d2a2212@linux-foundation.org> In-Reply-To: <20190307101010.919d18394ae43ecf9d2a2212@linux-foundation.org> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.24.148.75] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCj4gLS0tLS3Tyrz+1K28/i0tLS0tDQo+ILeivP7IyzogbGludXgta2VybmVsLW93bmVyQHZn ZXIua2VybmVsLm9yZw0KPiBbbWFpbHRvOmxpbnV4LWtlcm5lbC1vd25lckB2Z2VyLmtlcm5lbC5v cmddILT6se0gQW5kcmV3IE1vcnRvbg0KPiC3osvNyrG85DogMjAxOcTqM9TCOMjVIDI6MTANCj4g ytW8/sjLOiBMaSxSb25ncWluZyA8bGlyb25ncWluZ0BiYWlkdS5jb20+DQo+ILOty806IGxpbnV4 LWtlcm5lbEB2Z2VyLmtlcm5lbC5vcmc7IERhdmlkbG9ociBCdWVzbyA8ZGJ1ZXNvQHN1c2UuZGU+ Ow0KPiBEb21pbmlrIEJyb2Rvd3NraSA8bGludXhAZG9taW5pa2Jyb2Rvd3NraS5uZXQ+OyBNYW5m cmVkIFNwcmF1bA0KPiA8bWFuZnJlZEBjb2xvcmZ1bGxpZmUuY29tPjsgQXJuZCBCZXJnbWFubiA8 YXJuZEBhcm5kYi5kZT4NCj4g1vfM4jogUmU6IFtQQVRDSF0gaXBjOiBwcmV2ZW50IGxvY2t1cCBv biBhbGxvY19tc2cgYW5kIGZyZWVfbXNnDQo+IA0KPiBPbiBUaHUsICA3IE1hciAyMDE5IDE2OjEw OjIyICswODAwIExpIFJvbmdRaW5nIDxsaXJvbmdxaW5nQGJhaWR1LmNvbT4NCj4gd3JvdGU6DQo+ IA0KPiA+IEZyb206IExpIFJvbmdxaW5nIDxsaXJvbmdxaW5nQGJhaWR1LmNvbT4NCj4gPg0KPiA+ IG1zZ2N0bDEwIG9mIGx0cCB0cmlnZ2VycyB0aGUgZm9sbG93aW5nIGxvY2t1cCBXaGVuIENPTkZJ R19LQVNBTiBpcw0KPiA+IGVuYWJsZWQgb24gbGFyZ2UgbWVtb3J5IFNNUCBzeXN0ZW1zLCB0aGUg cGFnZXMgaW5pdGlhbGl6YXRpb24gY2FuIHRha2UNCj4gPiBhIGxvbmcgdGltZSwgaWYgbXNnY3Rs MTAgcmVxdWVzdHMgYSBodWdlIGJsb2NrIG1lbW9yeSwgYW5kIGl0IHdpbGwNCj4gPiBibG9jayBy Y3Ugc2NoZWR1bGVyLCBzbyByZWxlYXNlIGNwdSBhY3RpdmVseS4NCj4gPg0KPiA+IC4uLg0KPiA+ DQo+ID4gU2lnbmVkLW9mZi1ieTogWmhhbmcgWXUgPHpoYW5neXUzMUBiYWlkdS5jb20+DQo+ID4g U2lnbmVkLW9mZi1ieTogTGkgUm9uZ1FpbmcgPGxpcm9uZ3FpbmdAYmFpZHUuY29tPg0KPiANCj4g VGhpcyBzaWdub2ZmIG9yZGVyaW5nIHNvbWV3aGF0IGltcGxpZXMgdGhhdCBaaGFuZyBZdSB3YXMg dGhlIGF1dGhvci4NCj4gQnV0IHlvdSBhZGRlZCAiRnJvbTogTGkgUm9uZ3FpbmciLCBzbyB5b3Ug d2lsbCBiZSByZWNvcmRlZCBhcyB0aGUgcGF0Y2gncw0KPiBhdXRob3IuICBJcyB0aGlzIGNvcnJl Y3Q/DQo+IA0KVGhhbmtzIGZvciB5b3VyIHJldmlldy4NCkkgd2lsbCByZXZlcnQgdGhpcyBvcmRl cg0KDQo+ID4gLS0tIGEvaXBjL21zZ3V0aWwuYw0KPiA+ICsrKyBiL2lwYy9tc2d1dGlsLmMNCj4g PiBAQCAtMTgsNiArMTgsNyBAQA0KPiA+ICAjaW5jbHVkZSA8bGludXgvdXRzbmFtZS5oPg0KPiA+ ICAjaW5jbHVkZSA8bGludXgvcHJvY19ucy5oPg0KPiA+ICAjaW5jbHVkZSA8bGludXgvdWFjY2Vz cy5oPg0KPiA+ICsjaW5jbHVkZSA8bGludXgvc2NoZWQuaD4NCj4gPg0KPiA+ICAjaW5jbHVkZSAi dXRpbC5oIg0KPiA+DQo+ID4gQEAgLTcyLDYgKzczLDcgQEAgc3RhdGljIHN0cnVjdCBtc2dfbXNn ICphbGxvY19tc2coc2l6ZV90IGxlbikNCj4gPiAgCQlzZWctPm5leHQgPSBOVUxMOw0KPiA+ICAJ CXBzZWcgPSAmc2VnLT5uZXh0Ow0KPiA+ICAJCWxlbiAtPSBhbGVuOw0KPiA+ICsJCWNvbmRfcmVz Y2hlZCgpOw0KPiA+ICAJfQ0KPiANCj4gVGhpcyBsb29rcyBPSy4NCj4gDQo+ID4gIAlyZXR1cm4g bXNnOw0KPiA+IEBAIC0xNzgsNSArMTgwLDYgQEAgdm9pZCBmcmVlX21zZyhzdHJ1Y3QgbXNnX21z ZyAqbXNnKQ0KPiA+ICAJCXN0cnVjdCBtc2dfbXNnc2VnICp0bXAgPSBzZWctPm5leHQ7DQo+ID4g IAkJa2ZyZWUoc2VnKTsNCj4gPiAgCQlzZWcgPSB0bXA7DQo+ID4gKwkJY29uZF9yZXNjaGVkKCk7 DQo+ID4gIAl9DQo+IA0KPiBUaGlzIGRvZXMgbm90LiAgbXF1ZXVlX2V2aWN0X2lub2RlKCkgKGF0 IGxlYXN0KSBjYWxscyBmcmVlX21zZygpIGZyb20gdW5kZXINCj4gc3Bpbl9sb2NrKCkuDQoNCg0K SSB3aWxsIHRyeSB0byBmaXggaXQgYnkgbW92aW5nIHRoZSBmcmVlX21zZygpIG91dCBvZiBzcGlu bG9jayAsIHRoYW5rcw0KDQotUm9uZ1FpbmcNCg0K