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Tue, 07 Jan 2020 06:22:12 -0800 (PST) Received: from N-20L6PF1KTYA2 ([131.228.2.20]) by smtp.gmail.com with ESMTPSA id g27sm30449385lfh.57.2020.01.07.06.22.09 (version=TLS1_2 cipher=AES128-GCM-SHA256 bits=128/128); Tue, 07 Jan 2020 06:22:11 -0800 (PST) Date: Tue, 7 Jan 2020 22:22:09 +0800 From: "lixinhai.lxh@gmail.com" To: khlebnikov , "linux-mm@kvack.org" , akpm , "linux-kernel@vger.kernel.org" , richardw.yang Cc: "Rik van Riel" , kirill.shutemov Subject: Re: [PATCH v2 2/2] kernel/fork: set VMA's mm/prev/next right after vm_area_dup in dup_mmap References: <157839239609.694.10268055713935919822.stgit@buzz>, <157839239842.694.2288178566540902852.stgit@buzz> X-Priority: 3 X-GUID: 082A53C1-8861-4E84-A660-0C728306E2A6 X-Has-Attach: no X-Mailer: Foxmail 7.2.13.365[cn] Mime-Version: 1.0 Message-ID: <2020010722220744833867@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: T24gMjAyMC0wMS0wN8KgYXQgMTg6MTnCoEtvbnN0YW50aW4gS2hsZWJuaWtvdsKgd3JvdGU6Cj5G dW5jdGlvbiB2bV9hcmVhX2R1cCgpIG1ha2VzIGV4YWN0IGNvcHkgb2Ygc3RydWN0dXJlLiBJdCdz IGJldHRlciB0byBzdG9wCj5yZWZlcmVuY2luZyBwYXJlbnQgc3RydWN0dXJlcyBiZWNhdXNlIHZh cmlvdXMgaGVscGVycyB1c2UgdGhlc2UgcG9pbnRlcnMuCj4KPkZvciBleGFtcGxlIGlmIFZNX1dJ UEVPTkZPUksgaXMgc2V0IHRoZW4gYW5vbl92bWFfcHJlcGFyZSgpIHdpbGwgdHJ5IHRvCj5tZXJn ZSBhbm9uX3ZtYSB3aXRoIHByZXZpb3VzIGFuZCBuZXh0IFZNQS4gUG9raW5nIHBhcmVudCBWTUFz IGFuZCBzaGFyaW5nCj50aGVpciBhbm9uX3ZtYSBpcyBzYWZlIGZvciBub3cgYnV0IGlzIG5vdCBl eHBlY3RlZCBiZWhhdmlvci4KPgo+Tm90ZTogdGhpcyB3aWxsIGJyZWFrIGNvbW1pdCA0ZTRhOWVi OTIxMzMgKCJtbS9ybWFwLmM6IHJldXNlIG1lcmdlYWJsZQo+YW5vbl92bWEgYXMgcGFyZW50IHdo ZW4gZm9yayIpIHdpdGhvdXQgcmVsYXRlZCBmaXggYmVjYXVzZSBpdCBjb250YWlucwo+c2V2ZXJh bCBmbGF3cyBoaWRkZW4gYnkgY3VycmVudCBpbml0aWFsaXphdGlvbiBzZXF1ZW5jZSBpbiBkdXBf bW1hcCgpLgo+Cj5TaWduZWQtb2ZmLWJ5OiBLb25zdGFudGluIEtobGVibmlrb3YgPGtobGVibmlr b3ZAeWFuZGV4LXRlYW0ucnU+IAoKbG9va3MgZmluZSB0byBtZS4KUmV2aWV3ZWQtYnk6IExpIFhp bmhhaSA8bGl4aW5oYWkubHhoQGdtYWlsLmNvbT4KCj4tLS0KPiBrZXJuZWwvZm9yay5jIHzCoMKg wqAgNiArKystLS0KPiAxIGZpbGUgY2hhbmdlZCwgMyBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9u cygtKQo+Cj5kaWZmIC0tZ2l0IGEva2VybmVsL2ZvcmsuYyBiL2tlcm5lbC9mb3JrLmMKPmluZGV4 IGMzMzYyNjk5MzgzMS4uNzg0YzlhZTU2YWE5IDEwMDY0NAo+LS0tIGEva2VybmVsL2ZvcmsuYwo+ KysrIGIva2VybmVsL2ZvcmsuYwo+QEAgLTU0NCwxMCArNTQ0LDEyIEBAIHN0YXRpYyBfX2xhdGVu dF9lbnRyb3B5IGludCBkdXBfbW1hcChzdHJ1Y3QgbW1fc3RydWN0ICptbSwKPiB0bXAgPSB2bV9h cmVhX2R1cChtcG50KTsKPiBpZiAoIXRtcCkKPiBnb3RvIGZhaWxfbm9tZW07Cj4rCXRtcC0+dm1f bW0gPSBtbTsKPisJdG1wLT52bV9wcmV2ID0gcHJldjsKPisJdG1wLT52bV9uZXh0ID0gTlVMTDsK PiByZXR2YWwgPSB2bWFfZHVwX3BvbGljeShtcG50LCB0bXApOwo+IGlmIChyZXR2YWwpCj4gZ290 byBmYWlsX25vbWVtX3BvbGljeTsKPi0JdG1wLT52bV9tbSA9IG1tOwo+IHJldHZhbCA9IGR1cF91 c2VyZmF1bHRmZCh0bXAsICZ1Zik7Cj4gaWYgKHJldHZhbCkKPiBnb3RvIGZhaWxfbm9tZW1fYW5v bl92bWFfZm9yazsKPkBAIC01NTksNyArNTYxLDYgQEAgc3RhdGljIF9fbGF0ZW50X2VudHJvcHkg aW50IGR1cF9tbWFwKHN0cnVjdCBtbV9zdHJ1Y3QgKm1tLAo+IH0gZWxzZSBpZiAoYW5vbl92bWFf Zm9yayh0bXAsIG1wbnQsIHByZXYpKQo+IGdvdG8gZmFpbF9ub21lbV9hbm9uX3ZtYV9mb3JrOwo+ IHRtcC0+dm1fZmxhZ3MgJj0gfihWTV9MT0NLRUQgfCBWTV9MT0NLT05GQVVMVCk7Cj4tCXRtcC0+ dm1fbmV4dCA9IHRtcC0+dm1fcHJldiA9IE5VTEw7Cj4gZmlsZSA9IHRtcC0+dm1fZmlsZTsKPiBp ZiAoZmlsZSkgewo+IHN0cnVjdCBpbm9kZSAqaW5vZGUgPSBmaWxlX2lub2RlKGZpbGUpOwo+QEAg LTU5Miw3ICs1OTMsNiBAQCBzdGF0aWMgX19sYXRlbnRfZW50cm9weSBpbnQgZHVwX21tYXAoc3Ry dWN0IG1tX3N0cnVjdCAqbW0sCj4gKi8KPiAqcHByZXYgPSB0bXA7Cj4gcHByZXYgPSAmdG1wLT52 bV9uZXh0Owo+LQl0bXAtPnZtX3ByZXYgPSBwcmV2Owo+IHByZXYgPSB0bXA7Cj4KPiBfX3ZtYV9s aW5rX3JiKG1tLCB0bXAsIHJiX2xpbmssIHJiX3BhcmVudCk7Cj4=