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Fri, 9 Sep 2022 13:56:32 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 171C242041; Fri, 9 Sep 2022 13:56:08 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 039F44203F; Fri, 9 Sep 2022 13:56:07 +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 13:56:06 +0000 (GMT) Message-ID: Date: Fri, 9 Sep 2022 15:56:06 +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 16/28] kernel/fork: assert no VMA readers during its destruction 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> <20220901173516.702122-17-surenb@google.com> From: Laurent Dufour In-Reply-To: <20220901173516.702122-17-surenb@google.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: P-SppGO3iL1jinbWZiGS1-PZPCNK-_NX X-Proofpoint-GUID: t2fl4Ou9Hhb7jrL_XI7bfB-mBOC0S110 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 mlxlogscore=999 priorityscore=1501 bulkscore=0 spamscore=0 malwarescore=0 suspectscore=0 clxscore=1015 mlxscore=0 adultscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2209090047 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220909_065636_866095_3F883167 X-CRM114-Status: GOOD ( 25.28 ) 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 QXNzZXJ0IHRoZXJlIGFyZSBubyBob2xkZXJzIG9mIFZNQSBsb2NrIGZvciByZWFkaW5nIHdoZW4g aXQgaXMgYWJvdXQgdG8gYmUKPiBkZXN0cm95ZWQuCj4gCj4gU2lnbmVkLW9mZi1ieTogU3VyZW4g QmFnaGRhc2FyeWFuIDxzdXJlbmJAZ29vZ2xlLmNvbT4KPiAtLS0KPiAgaW5jbHVkZS9saW51eC9t bS5oIHwgOCArKysrKysrKwo+ICBrZXJuZWwvZm9yay5jICAgICAgfCAyICsrCj4gIDIgZmlsZXMg Y2hhbmdlZCwgMTAgaW5zZXJ0aW9ucygrKQo+IAo+IGRpZmYgLS1naXQgYS9pbmNsdWRlL2xpbnV4 L21tLmggYi9pbmNsdWRlL2xpbnV4L21tLmgKPiBpbmRleCBkYzcyYmU5MjNlNWIuLjBkOWMxNTYz YzM1NCAxMDA2NDQKPiAtLS0gYS9pbmNsdWRlL2xpbnV4L21tLmgKPiArKysgYi9pbmNsdWRlL2xp bnV4L21tLmgKPiBAQCAtNjc2LDYgKzY3NiwxMyBAQCBzdGF0aWMgaW5saW5lIHZvaWQgdm1hX2Fz c2VydF93cml0ZV9sb2NrZWQoc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsIGludCBwb3MpCj4g IAlWTV9CVUdfT05fVk1BKHZtYS0+dm1fbG9ja19zZXEgIT0gUkVBRF9PTkNFKHZtYS0+dm1fbW0t Pm1tX2xvY2tfc2VxKSwgdm1hKTsKPiAgfQo+ICAKPiArc3RhdGljIGlubGluZSB2b2lkIHZtYV9h c3NlcnRfbm9fcmVhZGVyKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKQo+ICt7Cj4gKwlWTV9C VUdfT05fVk1BKHJ3c2VtX2lzX2xvY2tlZCgmdm1hLT5sb2NrKSAmJgo+ICsJCSAgICAgIHZtYS0+ dm1fbG9ja19zZXEgIT0gUkVBRF9PTkNFKHZtYS0+dm1fbW0tPm1tX2xvY2tfc2VxKSwKPiArCQkg ICAgICB2bWEpOwo+ICt9Cj4gKwo+ICAjZWxzZSAvKiBDT05GSUdfUEVSX1ZNQV9MT0NLICovCj4g IAo+ICBzdGF0aWMgaW5saW5lIHZvaWQgdm1hX2luaXRfbG9jayhzdHJ1Y3Qgdm1fYXJlYV9zdHJ1 Y3QgKnZtYSkge30KPiBAQCAtNjg1LDYgKzY5Miw3IEBAIHN0YXRpYyBpbmxpbmUgYm9vbCB2bWFf cmVhZF90cnlsb2NrKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKQo+ICBzdGF0aWMgaW5saW5l IHZvaWQgdm1hX3JlYWRfdW5sb2NrKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKSB7fQo+ICBz dGF0aWMgaW5saW5lIHZvaWQgdm1hX2Fzc2VydF9sb2NrZWQoc3RydWN0IHZtX2FyZWFfc3RydWN0 ICp2bWEpIHt9Cj4gIHN0YXRpYyBpbmxpbmUgdm9pZCB2bWFfYXNzZXJ0X3dyaXRlX2xvY2tlZChz dHJ1Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZtYSwgaW50IHBvcykge30KPiArc3RhdGljIGlubGluZSB2 b2lkIHZtYV9hc3NlcnRfbm9fcmVhZGVyKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hKSB7fQo+ ICAKPiAgI2VuZGlmIC8qIENPTkZJR19QRVJfVk1BX0xPQ0sgKi8KPiAgCj4gZGlmZiAtLWdpdCBh L2tlcm5lbC9mb3JrLmMgYi9rZXJuZWwvZm9yay5jCj4gaW5kZXggMTg3MmFkNTQ5ZmVkLi5iNDQz YmEzYTI0N2EgMTAwNjQ0Cj4gLS0tIGEva2VybmVsL2ZvcmsuYwo+ICsrKyBiL2tlcm5lbC9mb3Jr LmMKPiBAQCAtNDg3LDYgKzQ4Nyw4IEBAIHN0YXRpYyB2b2lkIF9fdm1fYXJlYV9mcmVlKHN0cnVj dCByY3VfaGVhZCAqaGVhZCkKPiAgewo+ICAJc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEgPSBj b250YWluZXJfb2YoaGVhZCwgc3RydWN0IHZtX2FyZWFfc3RydWN0LAo+ICAJCQkJCQkgIHZtX3Jj dSk7Cj4gKwkvKiBUaGUgdm1hIHNob3VsZCBlaXRoZXIgaGF2ZSBubyBsb2NrIGhvbGRlcnMgb3Ig YmUgd3JpdGUtbG9ja2VkLiAqLwo+ICsJdm1hX2Fzc2VydF9ub19yZWFkZXIodm1hKTsKCkknbSB3 b25kZXJpbmcgaWYgdGhpcyBjYW4gYmUgaGl0IGluIHRoZSBjYXNlIHRoZSB0aHJlYWQgZnJlZWlu ZyBhIFZNQSBpcwpwcmVlbXB0ZWQgYmVmb3JlIGluY3JlbWVudGluZyB0aGUgbW0gcmVmIGNvdW50 LCBsaWtlIHRoaXM6CgpWTUEgaXMgYWJvdXQgdG8gYmUgZnJlZWQKd3JpdGUgbG9jayBWTUEKZnJl ZSB2bWEgLT4gY2FsbF9yY3UKLi4KPC0tLSB0aHJlYWQgcHJlZW1wdGVkCglyY3UgaGFuZGxlciBy dW5zCglyY3UgY2FsbHMgX192bV9hcmVhX2ZyZWUoKSA8PDw8PDwKdW5sb2NrIG1tYXBfbG9jayBh bmQgaW5jcmVhc2UgdGhlIG1tIHNlcSBjb3VudAoKCj4gIAlrbWVtX2NhY2hlX2ZyZWUodm1fYXJl YV9jYWNoZXAsIHZtYSk7Cj4gIH0KPiAgI2VuZGlmCgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGlu dXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQu b3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=