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Fri, 9 Sep 2022 14:20:37 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7B70542042; Fri, 9 Sep 2022 14:20:37 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6167E4203F; Fri, 9 Sep 2022 14:20:36 +0000 (GMT) Received: from [9.145.83.17] (unknown [9.145.83.17]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 9 Sep 2022 14:20:36 +0000 (GMT) Message-ID: <70a7d9cd-e64b-db49-e418-b4de7fcf8692@linux.ibm.com> Date: Fri, 9 Sep 2022 16:20:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.2.1 Subject: Re: [RFC PATCH RESEND 17/28] mm/mmap: prevent pagefault handler from racing with mmu_notifier registration Content-Language: fr To: Suren Baghdasaryan , akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, kernel-team@android.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org References: <20220901173516.702122-1-surenb@google.com> <20220901173516.702122-18-surenb@google.com> From: Laurent Dufour In-Reply-To: <20220901173516.702122-18-surenb@google.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: iGD1tmfWW3MB8GuX-XKLgDYuqetnM8iW X-Proofpoint-ORIG-GUID: cHqg_70A5LQCVVOFQNQjRcOJVIq9uaqR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-09_08,2022-09-09_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=999 spamscore=0 clxscore=1015 mlxscore=0 phishscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2209090049 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220909_072057_141519_635FD3A1 X-CRM114-Status: GOOD ( 25.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 TGUgMDEvMDkvMjAyMiDDoCAxOTozNSwgU3VyZW4gQmFnaGRhc2FyeWFuIGEgw6ljcml0wqA6Cj4g UGFnZWZhdWx0IGhhbmRsZXJzIG1pZ2h0IG5lZWQgdG8gZmlyZSBNTVUgbm90aWZpY2F0aW9ucyB3 aGlsZSBhIG5ldwo+IG5vdGlmaWVyIGlzIGJlaW5nIHJlZ2lzdGVyZWQuIE1vZGlmeSBtbV90YWtl X2FsbF9sb2NrcyB0byBtYXJrIGFsbCBWTUFzCj4gYXMgbG9ja2VkIGFuZCBwcmV2ZW50IHRoaXMg cmFjZSB3aXRoIGZhdWx0IGhhbmRsZXJzIHRoYXQgd291bGQgaG9sZCBWTUEKPiBsb2Nrcy4KPiAK PiBTaWduZWQtb2ZmLWJ5OiBTdXJlbiBCYWdoZGFzYXJ5YW4gPHN1cmVuYkBnb29nbGUuY29tPgo+ IC0tLQo+ICBtbS9tbWFwLmMgfCAzICsrKwo+ICAxIGZpbGUgY2hhbmdlZCwgMyBpbnNlcnRpb25z KCspCj4gCj4gZGlmZiAtLWdpdCBhL21tL21tYXAuYyBiL21tL21tYXAuYwo+IGluZGV4IGIzMWNj OTdjMjgwMy4uMWVkZmNkMzg0ZjVlIDEwMDY0NAo+IC0tLSBhL21tL21tYXAuYwo+ICsrKyBiL21t L21tYXAuYwo+IEBAIC0zNTM4LDYgKzM1MzgsNyBAQCBzdGF0aWMgdm9pZCB2bV9sb2NrX21hcHBp bmcoc3RydWN0IG1tX3N0cnVjdCAqbW0sIHN0cnVjdCBhZGRyZXNzX3NwYWNlICptYXBwaW5nKQo+ ICAgKiAgICAgaHVnZXRsYiBtYXBwaW5nKTsKPiAgICogICAtIGFsbCBpX21tYXBfcndzZW0gbG9j a3M7Cj4gICAqICAgLSBhbGwgYW5vbl92bWEtPnJ3c2VtbAo+ICsgKiAgIC0gYWxsIHZtYXMgbWFy a2VkIGxvY2tlZAoKSUlSQywgdGhlIGFub25fdm1hIG1heSBiZSBsb2NrZWQgZHVyaW5nIHRoZSBw YWdlIGZhdWx0IGhhbmRsaW5nLCBhbmQgdGhpcwpoYXBwZW5zIGFmdGVyIHRoZSBWTUEgaXMgcmVh ZCBsb2NrLiBJIHRoaW5rIHRoZSBzYW1lIGFwcGxpZXMgdG8KaV9tbWFwX3J3c2VtIGxvY2suCgpU aHVzLCB0aGUgVk1BIHNob3VsZCBiZSBtYXJrZWQgbG9ja2VkIGZpcnN0LgoKPiAgICoKPiAgICog V2UgY2FuIHRha2UgYWxsIGxvY2tzIHdpdGhpbiB0aGVzZSB0eXBlcyByYW5kb21seSBiZWNhdXNl IHRoZSBWTSBjb2RlCj4gICAqIGRvZXNuJ3QgbmVzdCB0aGVtIGFuZCB3ZSBwcm90ZWN0ZWQgZnJv bSBwYXJhbGxlbCBtbV90YWtlX2FsbF9sb2NrcygpIGJ5Cj4gQEAgLTM1NzksNiArMzU4MCw3IEBA IGludCBtbV90YWtlX2FsbF9sb2NrcyhzdHJ1Y3QgbW1fc3RydWN0ICptbSkKPiAgCQlpZiAodm1h LT5hbm9uX3ZtYSkKPiAgCQkJbGlzdF9mb3JfZWFjaF9lbnRyeShhdmMsICZ2bWEtPmFub25fdm1h X2NoYWluLCBzYW1lX3ZtYSkKPiAgCQkJCXZtX2xvY2tfYW5vbl92bWEobW0sIGF2Yy0+YW5vbl92 bWEpOwo+ICsJCXZtYV9tYXJrX2xvY2tlZCh2bWEpOwo+ICAJfQo+ICAKPiAgCXJldHVybiAwOwo+ IEBAIC0zNjM2LDYgKzM2MzgsNyBAQCB2b2lkIG1tX2Ryb3BfYWxsX2xvY2tzKHN0cnVjdCBtbV9z dHJ1Y3QgKm1tKQo+ICAJbW1hcF9hc3NlcnRfd3JpdGVfbG9ja2VkKG1tKTsKPiAgCUJVR19PTigh bXV0ZXhfaXNfbG9ja2VkKCZtbV9hbGxfbG9ja3NfbXV0ZXgpKTsKPiAgCj4gKwl2bWFfbWFya191 bmxvY2tlZF9hbGwobW0pOwo+ICAJZm9yICh2bWEgPSBtbS0+bW1hcDsgdm1hOyB2bWEgPSB2bWEt PnZtX25leHQpIHsKPiAgCQlpZiAodm1hLT5hbm9uX3ZtYSkKPiAgCQkJbGlzdF9mb3JfZWFjaF9l bnRyeShhdmMsICZ2bWEtPmFub25fdm1hX2NoYWluLCBzYW1lX3ZtYSkKCgpfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxp bmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3Rz LmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==