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Sat, 10 May 2025 11:25:18 +0800 (CST) Date: Sat, 10 May 2025 11:25:18 +0800 (CST) From: "David Wang" <00107082@163.com> To: "Tim Chen" Cc: surenb@google.com, kent.overstreet@linux.dev, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 2/2] alloc_tag: keep codetag iterator active between read() calls X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT5.0.14 build 20240801(9da12a7b) Copyright (c) 2002-2025 www.mailtech.cn 163com In-Reply-To: <7f237574d9f08a9fa8dcaa60d2edf8d8e91441d4.camel@linux.intel.com> References: <20250507175500.204569-1-00107082@163.com> <20250509173929.42508-1-00107082@163.com> <7f237574d9f08a9fa8dcaa60d2edf8d8e91441d4.camel@linux.intel.com> X-NTES-SC: AL_Qu2fBPSfuE0q7imdYukZnEYQheY4XMKyuPkg1YJXOp80liTj+QsqeHJmM2fy0MWCMhmgvRWIThZo2P9Ff7J6UbIjiec6pflHcWV1TvGZ1P7k Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <4538ec3b.1052.196b839d0f1.Coremail.00107082@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID:gCgvCgD3n+Ufxx5oeSwBAA--.7119W X-CM-SenderInfo: qqqrilqqysqiywtou0bp/xtbBkBxJqmgevNQrKQAHs0 X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== CgpBdCAyMDI1LTA1LTEwIDAyOjMzOjQ4LCAiVGltIENoZW4iIDx0aW0uYy5jaGVuQGxpbnV4Lmlu dGVsLmNvbT4gd3JvdGU6Cj5PbiBTYXQsIDIwMjUtMDUtMTAgYXQgMDE6MzkgKzA4MDAsIERhdmlk IFdhbmcgd3JvdGU6Cj4+IAo+PiAKPj4gU2lnbmVkLW9mZi1ieTogRGF2aWQgV2FuZyA8MDAxMDcw ODJAMTYzLmNvbT4KPj4gLS0tCj4+ICBsaWIvYWxsb2NfdGFnLmMgfCAyOSArKysrKysrKysrLS0t LS0tLS0tLS0tLS0tLS0tLQo+PiAgMSBmaWxlIGNoYW5nZWQsIDEwIGluc2VydGlvbnMoKyksIDE5 IGRlbGV0aW9ucygtKQo+PiAKPj4gZGlmZiAtLWdpdCBhL2xpYi9hbGxvY190YWcuYyBiL2xpYi9h bGxvY190YWcuYwo+PiBpbmRleCAyNWVjYzEzMzRiNjcuLmZkZDU4ODc3NjlhNiAxMDA2NDQKPj4g LS0tIGEvbGliL2FsbG9jX3RhZy5jCj4+ICsrKyBiL2xpYi9hbGxvY190YWcuYwo+PiBAQCAtNDUs MjEgKzQ1LDE2IEBAIHN0cnVjdCBhbGxvY2luZm9fcHJpdmF0ZSB7Cj4+ICBzdGF0aWMgdm9pZCAq YWxsb2NpbmZvX3N0YXJ0KHN0cnVjdCBzZXFfZmlsZSAqbSwgbG9mZl90ICpwb3MpCj4+ICB7Cj4+ ICAJc3RydWN0IGFsbG9jaW5mb19wcml2YXRlICpwcml2Owo+PiAtCXN0cnVjdCBjb2RldGFnICpj dDsKPj4gIAlsb2ZmX3Qgbm9kZSA9ICpwb3M7Cj4+ICAKPj4gLQlwcml2ID0ga3phbGxvYyhzaXpl b2YoKnByaXYpLCBHRlBfS0VSTkVMKTsKPj4gLQltLT5wcml2YXRlID0gcHJpdjsKPj4gLQlpZiAo IXByaXYpCj4+IC0JCXJldHVybiBOVUxMOwo+PiAtCj4+IC0JcHJpdi0+cHJpbnRfaGVhZGVyID0g KG5vZGUgPT0gMCk7Cj4+ICsJcHJpdiA9IChzdHJ1Y3QgYWxsb2NpbmZvX3ByaXZhdGUgKiltLT5w cml2YXRlOwo+PiAgCWNvZGV0YWdfbG9ja19tb2R1bGVfbGlzdChhbGxvY190YWdfY3R0eXBlLCB0 cnVlKTsKPj4gLQlwcml2LT5pdGVyID0gY29kZXRhZ19nZXRfY3RfaXRlcihhbGxvY190YWdfY3R0 eXBlKTsKPj4gLQl3aGlsZSAoKGN0ID0gY29kZXRhZ19uZXh0X2N0KCZwcml2LT5pdGVyKSkgIT0g TlVMTCAmJiBub2RlKQo+PiAtCQlub2RlLS07Cj4+IC0KPj4gLQlyZXR1cm4gY3QgPyBwcml2IDog TlVMTDsKPj4gKwlpZiAobm9kZSA9PSAwKSB7Cj4+ICsJCXByaXYtPnByaW50X2hlYWRlciA9IHRy dWU7Cj4+ICsJCXByaXYtPml0ZXIgPSBjb2RldGFnX2dldF9jdF9pdGVyKGFsbG9jX3RhZ19jdHR5 cGUpOwo+PiArCQljb2RldGFnX25leHRfY3QoJnByaXYtPml0ZXIpOwo+PiArCX0KPgo+RG8geW91 IG5lZWQgdG8gc2tpcCBwcmludCBoZWFkZXIgd2hlbiAqcG9zICE9IDA/IGkuZSBhZGQKPgo+CX0g ZWxzZSB7Cj4JCXByaXYtPnByaW50X2hlYWRlciA9IGZhbHNlOwo+CX0KPgo+VGltCgpwcmludF9o ZWFkZXIgZmxhZyB3aWxsIGJlIHNldCB0byBmYWxzZSBvbmNlIGhlYWRlciBpcyBwcmludGVkLCBp biBhbGxvY2luZm9fc2hvdygpOgoxMTQgICAgICAgICBpZiAocHJpdi0+cHJpbnRfaGVhZGVyKSB7 CjExNSAgICAgICAgICAgICAgICAgcHJpbnRfYWxsb2NpbmZvX2hlYWRlcigmYnVmKTsKMTE2ICAg ICAgICAgICAgICAgICBwcml2LT5wcmludF9oZWFkZXIgPSBmYWxzZTsKMTE3ICAgICAgICAgfQoK b25jZSBwcml2LT5wcmludF9oZWFkZXIpIGlzIHNldCB0byB0cnVlLCAgdGhlIGhlYWRlciB3aWxs IGJlIHByaW50ZWQgb25jZSBhbmQgb25seSBvbmNlIHVudGlsIGl0IGlzIApzZXQgdG8gdHJ1ZSBu ZXh0IHRpbWUuCgpUaGFua3MKRGF2aWQKCj4KPj4gKwlyZXR1cm4gcHJpdi0+aXRlci5jdCA/IHBy aXYgOiBOVUxMOwo+PiAgfQo+PiAgCg==