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Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH -next V2 5/7] arm64: add get_user to machine check safe Message-ID: References: <20220406091311.3354723-1-tongtiangen@huawei.com> <20220406091311.3354723-6-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220408_082228_218519_9BB40E9D X-CRM114-Status: GOOD ( 25.41 ) 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 T24gVGh1LCBBcHIgMDcsIDIwMjIgYXQgMTA6Mzg6MDRQTSArMDgwMCwgVG9uZyBUaWFuZ2VuIHdy b3RlOgo+IOWcqCAyMDIyLzQvNiAxOToyMiwgTWFyayBSdXRsYW5kIOWGmemBkzoKPiA+IE9uIFdl ZCwgQXByIDA2LCAyMDIyIGF0IDA5OjEzOjA5QU0gKzAwMDAsIFRvbmcgVGlhbmdlbiB3cm90ZToK PiA+ID4gQWRkIHNjZW5hcmlvcyBnZXRfdXNlciB0byBtYWNoaW5lIGNoZWNrIHNhZmUuIFRoZSBw cm9jZXNzaW5nIG9mCj4gPiA+IEVYX1RZUEVfVUFDQ0VTU19FUlJfWkVSTyBhbmQgRVhfVFlQRV9V QUNDRVNTX0VSUl9aRVJPX1VDRV9SRUNPVkVSWSBpcyBzYW1lCj4gPiA+IGFuZCBib3RoIHJldHVy biAtRUZBVUxULgo+ID4gCj4gPiBXaGljaCB1YWNjZXNzIGNhc2VzIGRvIHdlIGV4cGVjdCB0byAq bm90KiBiZSByZWNvdmVyYWJsZT8KPiA+IAo+ID4gTmFpdmVseSBJIHdvdWxkIGFzc3VtZSB0aGF0 IGlmIHdlJ3JlIGdvaW5nIHRvIHRyZWF0IGEgbWVtb3J5IGVycm9yIG9uIGEgdWFjY2Vzcwo+ID4g YXMgZmF0YWwgdG8gdXNlcnNwYWNlIHdlIHNob3VsZCBiZSBhYmxlIHRvIGRvIHRoYXQgZm9yICph bnkqIHVhY2Vzc2VzLgo+ID4gCj4gPiBUaGUgY29tbWl0IG1lc3NhZ2Ugc2hvdWxkIGV4cGxhaW4g d2h5IHdlIG5lZWQgdGhlIGRpc3RpbmN0aW9uIGJldHdlZW4gYQo+ID4gcmVjb3ZlcmFibGUgdWFj Y2VzcyBhbmQgYSBub24tcmVjb3ZlcmFibGUgdWFjY2Vzcy4KPiA+IAo+ID4gVGhhbmtzLAo+ID4g TWFyay4KPiAKPiBDdXJyZW50bHksIGFueSBtZW1vcnkgZXJyb3IgY29uc3VtZWQgaW4ga2VybmVs IG1vZGUgd2lsbCBsZWFkIHRvIHBhbmljCj4gKGRvX3NlYSgpKS4KPiAKPiBNeSBpZGVhIGlzIHRo YXQgbm90IGFsbCBtZW1vcnkgZXJyb3JzIGNvbnN1bWVkIGluIGtlcm5lbCBtb2RlIGFyZSBmYXRh bCwKPiBzdWNoIGFzIGNvcHlfIGZyb21fIHVzZXIvZ2V0XyB1c2VyIGlzIGEgbWVtb3J5IGVycm9y IGNvbnN1bWVkIHdoZW4KPiByZWFkaW5nIHVzZXIgZGF0YSBpbiB0aGUgcHJvY2VzcyBjb250ZXh0 LiBJbiB0aGlzIGNhc2UsIHdlIGNhbiBub3QgbGV0IHRoZQo+IGtlcm5lbCBwYW5pYywganVzdCBr aWxsIHRoZSBwcm9jZXNzIHdpdGhvdXQgYWZmZWN0aW5nIHRoZSBvcGVyYXRpb24KPiBvZiB0aGUg c3lzdGVtLgoKSSB1bmRlcnN0b29kIHRoaXMgcGFydC4KCj4gSG93ZXZlciwgbm90IGFsbCB1YWNj ZXNzIGNhbiBiZSByZWNvdmVyZWQgd2l0aG91dCBhZmZlY3RpbmcgdGhlIG5vcm1hbAo+IG9wZXJh dGlvbiBvZiB0aGUgc3lzdGVtLiBUaGUga2V5IGlzIG5vdCB3aGV0aGVyIGl0IGlzIHVhY2Nlc3Ms IGJ1dCB3aGV0aGVyCj4gdGhlcmUgYXJlIGtleSBkYXRhIGFmZmVjdGluZyB0aGUgbm9ybWFsIG9w ZXJhdGlvbiBvZiB0aGUgc3lzdGVtIGluIHRoZSByZWFkCj4gcGFnZS4KCk9rLiBDYW4geW91IGdp dmUgYW4gZXhhbXBsZSBvZiBzdWNoIGEgY2FzZSB3aGVyZSB0aGUgYSB1YWNjZXNzIHRoYXQgaGl0 cwphIG1lbW9yeSBlcnJvciBtdXN0IGJlIGZhdGFsPwoKSSB0aGluayB5b3UgbWlnaHQgYmUgdHJ5 aW5nIHRvIHNheSB0aGF0IGZvciBjb3B5X3t0byxmcm9tfV91c2VyKCkgd2UgY2FuCm1ha2UgdGhh dCBqdWRnZW1lbnQsIGJ1dCB0aG9zZSBhcmUgY29tYmluZWQgdXNlcitrZXJuZWwgYWNjZXNzCnBy aW1pdGl2ZXMsIGFuZCB0aGUgKnVhY2Nlc3MqIHBhcnQgc2hvdWxkIG5ldmVyIGJlIHJlYWRpbmcg ZnJvbSBhIHBhZ2UKd2l0aCAia2V5IGRhdGEgYWZmZWN0aW5nIHRoZSBub3JtYWwgb3BlcmF0aW9u IG9mIHRoZSBzeXN0ZW0iLCBzaW5jZQp0aGF0J3MgdXNlcnNwYWNlIG1lbW9yeS4KCklzIHRoZXJl IGFueSAqdXNlcnNwYWNlIGFjY2VzcyogKGUuZy4gd2hlcmUgd2UgdXNlIExEVFIvU1RUUiB0b2Rh eSkKd2hlcmUgd2UgbXVzdCB0cmVhdCBhIG1lbW9yeSBlcnJvciBhcyBmYXRhbCB0byB0aGUgc3lz dGVtPwoKVGhhbmtzLApNYXJrLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5l bEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4v bGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=