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Mon, 5 Jul 2021 17:24:41 +0800 Message-ID: <1625477081.856.5.camel@mtkswgap22> Subject: Re: [PATCH] mm/sparse: clarify pgdat_to_phys From: Miles Chen To: Mike Rapoport CC: Andrew Morton , Mark Rutland , , , , Date: Mon, 5 Jul 2021 17:24:41 +0800 In-Reply-To: References: <20210630092309.17654-1-miles.chen@mediatek.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gRnJpLCAyMDIxLTA3LTAyIGF0IDE2OjExICswMzAwLCBNaWtlIFJhcG9wb3J0IHdyb3RlOg0K PiBPbiBXZWQsIEp1biAzMCwgMjAyMSBhdCAwNToyMzowOVBNICswODAwLCBNaWxlcyBDaGVuIHdy b3RlOg0KPiA+IGNsYXJpZnkgcGdkYXRfdG9fcGh5cygpIGJ5IHdyYXBwaW5nIHBnZGF0X3RvX3Bo eXMNCj4gPiB3aXRoIENPTkZJR19OVU1BLiAodGhlIHNhbWUgY29uZmlnIGFzIGNvbnRpZ19wYWdl X2RhdGEpDQo+ID4gDQo+ID4gTm8gZnVuY3Rpb25hbCBjaGFuZ2UgaW50ZW5kZWQuDQo+ID4gDQo+ ID4gQ29tbWVudCBmcm9tIE1hcmsgWzFdOg0KPiA+ICINCj4gPiAuLi4gYW5kIEkgcmVja29uIGl0 J2QgYmUgY2xlYXJlciBhbmQgbW9yZSByb2J1c3QgdG8gZGVmaW5lDQo+ID4gcGdkYXRfdG9fcGh5 cygpIGluIHRoZSBzYW1lIGlmZGVmcyBhcyBjb250aWdfcGFnZV9kYXRhIHNvDQo+ID4gdGhhdCB0 aGVzZSwgc3RheSBpbi1zeW5jLiBlLmcuIGhhdmU6DQo+ID4gDQo+ID4gfCAjaWZkZWYgQ09ORklH X05VTUENCj4gPiB8ICNkZWZpbmUgcGdkYXRfdG9fcGh5cyh4KQl2aXJ0X3RvX3BoeXMoeCkNCj4g PiB8ICNlbHNlIC8qIENPTkZJR19OVU1BICovDQo+ID4gfA0KPiA+IHwgZXh0ZXJuIHN0cnVjdCBw Z2xpc3RfZGF0YSBjb250aWdfcGFnZV9kYXRhOw0KPiA+IHwgLi4uDQo+ID4gfCAjZGVmaW5lIHBn ZGF0X3RvX3BoeXMoeCkJX19wYV9zeW1ib2woJmNvbnRpZ19wYWdlX2RhdGEpDQo+ID4gfA0KPiA+ IHwgI2VuZGlmIC8qIENPTklGSUdfTlVNQSAqLw0KPiA+ICINCj4gPiANCj4gPiBbMV0gaHR0cHM6 Ly9sb3JlLmtlcm5lbC5vcmcvbGludXgtYXJtLWtlcm5lbC8yMDIxMDYxNTEzMTkwMi5HQjQ3MTIx QEMwMlREMFVUSEYxVC5sb2NhbC8NCj4gPiANCj4gPiBDYzogTWFyayBSdXRsYW5kIDxtYXJrLnJ1 dGxhbmRAYXJtLmNvbT4NCj4gPiBTaWduZWQtb2ZmLWJ5OiBNaWxlcyBDaGVuIDxtaWxlcy5jaGVu QG1lZGlhdGVrLmNvbT4NCj4gPiAtLS0NCj4gPiAgbW0vc3BhcnNlLmMgfCAxNyArKysrKysrKyst LS0tLS0tLQ0KPiA+ICAxIGZpbGUgY2hhbmdlZCwgOSBpbnNlcnRpb25zKCspLCA4IGRlbGV0aW9u cygtKQ0KPiA+IA0KPiA+IGRpZmYgLS1naXQgYS9tbS9zcGFyc2UuYyBiL21tL3NwYXJzZS5jDQo+ ID4gaW5kZXggNzI3MmY3YTE0NDlkLi42MmMyMWVjMjhlMzMgMTAwNjQ0DQo+ID4gLS0tIGEvbW0v c3BhcnNlLmMNCj4gPiArKysgYi9tbS9zcGFyc2UuYw0KPiA+IEBAIC0zNDQsMTQgKzM0NCwxNSBA QCBzaXplX3QgbWVtX3NlY3Rpb25fdXNhZ2Vfc2l6ZSh2b2lkKQ0KPiA+ICAJcmV0dXJuIHNpemVv ZihzdHJ1Y3QgbWVtX3NlY3Rpb25fdXNhZ2UpICsgdXNlbWFwX3NpemUoKTsNCj4gPiAgfQ0KPiA+ ICANCj4gPiAtc3RhdGljIGlubGluZSBwaHlzX2FkZHJfdCBwZ2RhdF90b19waHlzKHN0cnVjdCBw Z2xpc3RfZGF0YSAqcGdkYXQpDQo+ID4gLXsNCj4gPiAtI2lmbmRlZiBDT05GSUdfTlVNQQ0KPiA+ IC0JcmV0dXJuIF9fcGFfc3ltYm9sKHBnZGF0KTsNCj4gPiAtI2Vsc2UNCj4gPiAtCXJldHVybiBf X3BhKHBnZGF0KTsNCj4gPiAtI2VuZGlmDQo+ID4gLX0NCj4gPiArI2lmZGVmIENPTkZJR19OVU1B DQo+ID4gKyNkZWZpbmUgcGdkYXRfdG9fcGh5cyhwZ2RhdCkgX19wYShwZ2RhdCkNCj4gPiArI2Vs c2UgLyogQ09ORklHX05VTUEgKi8NCj4gPiArLyoNCj4gPiArICogV2hlbiAhQ09ORklHX05VTUEs IHdlIG9ubHkgZXhwZWN0IHBnZGF0ID09ICZjb250aWdfcGFnZV9kYXRhLA0KPiA+ICsgKiBhbmQg dXNlIF9fcGFfc3ltYm9sKCkuDQo+ID4gKyAqLw0KPiA+ICsjZGVmaW5lIHBnZGF0X3RvX3BoeXMo cGdkYXQpIF9fcGFfc3ltYm9sKHBnZGF0KQ0KPiA+ICsjZW5kaWYgLyogQ09ORklHX05VTUEgKi8N Cj4gDQo+IEknbSBub3Qgc3VyZSBhIG1hY3JvIGlzIGJldHRlciB0aGFuIGEgc3RhdGljIGlubGlu ZS4NCj4gDQo+IE1heWJlIHdlJ2Qgd2FudCB0byB3YXJuIGlmIHBnZGF0IHBhc3NlZCB0byBwZ3Rh dF90b19waHlzKCkgaXMgbm90DQo+ICZjb250aWdfcGFnZV9kYXRhLCBlLmcgc29tZXRoaW5nIGxp a2UNCj4gDQo+IHN0YXRpYyBpbmxpbmUgcGh5c19hZGRyX3QgcGdkYXRfdG9fcGh5cyhzdHJ1Y3Qg cGdsaXN0X2RhdGEgKnBnZGF0KQ0KPiB7DQo+IAlpZiAoIUlTX0VOQUJMRUQoQ09ORklHX05VTUEp KSB7DQo+IAkJaWYgKHBnZGF0ID09ICZjb250aWdfcGFnZV9kYXRhKQ0KPiAJCQlyZXR1cm4gX19w YV9zeW1ib2woJmNvbnRpZ19wYWdlX2RhdGEpOw0KPiAJCWVsc2UNCj4gCQkJcHJfd2FybigiVW5l eHBlY3RlZCBwZ2xpc3RfZGF0YSBwb2ludGVyIVxuIik7DQo+IAl9DQo+IAkNCj4gCXJldHVybiBf X3BhKHBnZGF0KTsNCj4gfQ0KDQpTb3JyeSBmb3IgbXkgbGF0ZSByZXNwb25zZS4NClRoYW5rcyBm b3IgdGhlIGd1aWRlLiBJdCBsb29rcyBiZXR0ZXIgdGhpcyB3YXkuSSB3aWxsIHN1Ym1pdCBwYXRj aCB2Mi4NCg0KPiAgIA0KPiA+ICAjaWZkZWYgQ09ORklHX01FTU9SWV9IT1RSRU1PVkUNCj4gPiAg c3RhdGljIHN0cnVjdCBtZW1fc2VjdGlvbl91c2FnZSAqIF9faW5pdA0KPiA+IC0tIA0KPiA+IDIu MTguMA0KPiA+IA0KPiANCg0K