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[2003:ea:8f06:5500:6dbb:aa76:4e1a:5cc4]) by smtp.googlemail.com with ESMTPSA id g78sm12178501wme.33.2021.01.08.08.45.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Jan 2021 08:45:08 -0800 (PST) Subject: Re: [PATCH v2] dma-mapping: add unlikely hint for error path in dma_mapping_error To: Robin Murphy , Christoph Hellwig , Marek Szyprowski , Barry Song References: <39581f9a-0066-ad98-094d-d41082145e23@gmail.com> From: Heiner Kallweit Message-ID: <9cd308a1-2222-8716-2002-c0dacfaa6d91@gmail.com> Date: Fri, 8 Jan 2021 17:45:05 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: "open list:AMD IOMMU \(AMD-VI\)" , Linux Kernel Mailing List X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMTQuMTIuMjAyMCAxNDowMSwgUm9iaW4gTXVycGh5IHdyb3RlOgo+IE9uIDIwMjAtMTItMTMg MTY6MzIsIEhlaW5lciBLYWxsd2VpdCB3cm90ZToKPj4gWmlsbGlvbnMgb2YgZHJpdmVycyB1c2Ug dGhlIHVubGlrZWx5KCkgaGludCB3aGVuIGNoZWNraW5nIHRoZSByZXN1bHQgb2YKPj4gZG1hX21h cHBpbmdfZXJyb3IoKS4gVGhpcyBpcyBhbiBpbmxpbmUgZnVuY3Rpb24gYW55d2F5LCBzbyB3ZSBj YW4gbW92ZQo+PiB0aGUgaGludCBpbnRvIHRoaXMgZnVuY3Rpb24gYW5kIHJlbW92ZSBpdCBmcm9t IGRyaXZlcnMuCj4gCj4gUmV2aWV3ZWQtYnk6IFJvYmluIE11cnBoeSA8cm9iaW4ubXVycGh5QGFy bS5jb20+Cj4gCj4gRldJVyBJIGNvbnNpZGVyIHRoaXMgY2FzZSBzaW1pbGFyIHRvIHRoZSBzYW1l IGhpbnQgaW4gV0FSTl9PTigpIGFuZCBmcmllbmRzIC0gaXQncyBhIHByZXR0eSBzZXZlcmUgY29u ZGl0aW9uIHRoYXQgc2hvdWxkIG5ldmVyIGJlIGV4cGVjdGVkIHRvIGJlIGhpdCBpbiBub3JtYWwg b3BlcmF0aW9uLCBzbyBpdCdzIGVudGlyZWx5IGxvZ2ljYWwgZm9yIGl0IHRvIGJlIGltcGxpY2l0 bHkgdW5saWtlbHkuIEkgc3RydWdnbGUgdG8gaW1hZ2luZSBhbnkgY2FzZSB0aGF0IHdvdWxkIHNw ZWNpZmljYWxseSAqbm90KiB3YW50IHRoYXQgKG9yIHdvcnNlLCB3YW50IHRvIGhpbnQgaXQgYXMg bGlrZWx5KS4gU29tZSBETUEgQVBJIGJhY2tlbmRzIG1heSBzcGVuZCBjb25zaWRlcmFibGUgdGlt ZSB0cnlpbmcgYXMgaGFyZCBhcyBwb3NzaWJsZSB0byBtYWtlIGEgbWFwcGluZyB3b3JrIGJlZm9y ZSBldmVudHVhbGx5IGFkbWl0dGluZyBkZWZlYXQsIHNvIHRoZSBpZGVhIG9mIGV2ZXIgdHJ5aW5n IHRvIG9wdGltaXNlIGF0IHRoZSBkcml2ZXIgbGV2ZWwgZm9yIGZhaWx1cmUgaW4gaG90IHBhdGhz IGp1c3QgbWFrZXMgbm8gc2Vuc2UuCj4gCj4gVGhhbmtzLAo+IFJvYmluLgo+IAo+PiBTaWduZWQt b2ZmLWJ5OiBIZWluZXIgS2FsbHdlaXQgPGhrYWxsd2VpdDFAZ21haWwuY29tPgo+PiAtLS0KPj4g djI6Cj4+IFNwbGl0IHRoZSBiaWcgcGF0Y2ggaW50byB0aGUgY2hhbmdlIGZvciBkbWEtbWFwcGlu Zy5oIGFuZCBmb2xsb3ctdXAKPj4gcGF0Y2hlcyBwZXIgc3Vic3lzdGVtIHRoYXQgd2lsbCBnbyB0 aHJvdWdoIHRoZSB0cmVlcyBvZiB0aGUgcmVzcGVjdGl2ZQo+PiBtYWludGFpbmVycy4KPj4gLS0t Cj4+IMKgIGluY2x1ZGUvbGludXgvZG1hLW1hcHBpbmcuaCB8IDIgKy0KPj4gwqAga2VybmVsL2Rt YS9tYXBfYmVuY2htYXJrLmPCoCB8IDIgKy0KPj4gwqAgMiBmaWxlcyBjaGFuZ2VkLCAyIGluc2Vy dGlvbnMoKyksIDIgZGVsZXRpb25zKC0pCj4+Cj4+IGRpZmYgLS1naXQgYS9pbmNsdWRlL2xpbnV4 L2RtYS1tYXBwaW5nLmggYi9pbmNsdWRlL2xpbnV4L2RtYS1tYXBwaW5nLmgKPj4gaW5kZXggMmU0 OTk5NmE4Li42MTc3ZTIwYjUgMTAwNjQ0Cj4+IC0tLSBhL2luY2x1ZGUvbGludXgvZG1hLW1hcHBp bmcuaAo+PiArKysgYi9pbmNsdWRlL2xpbnV4L2RtYS1tYXBwaW5nLmgKPj4gQEAgLTk1LDcgKzk1 LDcgQEAgc3RhdGljIGlubGluZSBpbnQgZG1hX21hcHBpbmdfZXJyb3Ioc3RydWN0IGRldmljZSAq ZGV2LCBkbWFfYWRkcl90IGRtYV9hZGRyKQo+PiDCoCB7Cj4+IMKgwqDCoMKgwqAgZGVidWdfZG1h X21hcHBpbmdfZXJyb3IoZGV2LCBkbWFfYWRkcik7Cj4+IMKgIC3CoMKgwqAgaWYgKGRtYV9hZGRy ID09IERNQV9NQVBQSU5HX0VSUk9SKQo+PiArwqDCoMKgIGlmICh1bmxpa2VseShkbWFfYWRkciA9 PSBETUFfTUFQUElOR19FUlJPUikpCj4+IMKgwqDCoMKgwqDCoMKgwqDCoCByZXR1cm4gLUVOT01F TTsKPj4gwqDCoMKgwqDCoCByZXR1cm4gMDsKPj4gwqAgfQo+PiBkaWZmIC0tZ2l0IGEva2VybmVs L2RtYS9tYXBfYmVuY2htYXJrLmMgYi9rZXJuZWwvZG1hL21hcF9iZW5jaG1hcmsuYwo+PiBpbmRl eCBiMTQ5NmU3NDQuLjkwMTQyMGE1ZCAxMDA2NDQKPj4gLS0tIGEva2VybmVsL2RtYS9tYXBfYmVu Y2htYXJrLmMKPj4gKysrIGIva2VybmVsL2RtYS9tYXBfYmVuY2htYXJrLmMKPj4gQEAgLTc4LDcg Kzc4LDcgQEAgc3RhdGljIGludCBtYXBfYmVuY2htYXJrX3RocmVhZCh2b2lkICpkYXRhKQo+PiDC oCDCoMKgwqDCoMKgwqDCoMKgwqAgbWFwX3N0aW1lID0ga3RpbWVfZ2V0KCk7Cj4+IMKgwqDCoMKg wqDCoMKgwqDCoCBkbWFfYWRkciA9IGRtYV9tYXBfc2luZ2xlKG1hcC0+ZGV2LCBidWYsIFBBR0Vf U0laRSwgbWFwLT5kaXIpOwo+PiAtwqDCoMKgwqDCoMKgwqAgaWYgKHVubGlrZWx5KGRtYV9tYXBw aW5nX2Vycm9yKG1hcC0+ZGV2LCBkbWFfYWRkcikpKSB7Cj4+ICvCoMKgwqDCoMKgwqDCoCBpZiAo ZG1hX21hcHBpbmdfZXJyb3IobWFwLT5kZXYsIGRtYV9hZGRyKSkgewo+PiDCoMKgwqDCoMKgwqDC oMKgwqDCoMKgwqDCoCBwcl9lcnIoImRtYV9tYXBfc2luZ2xlIGZhaWxlZCBvbiAlc1xuIiwKPj4g wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBkZXZfbmFtZShtYXAtPmRldikpOwo+ PiDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCByZXQgPSAtRU5PTUVNOwo+PgoKSXMgdGhpcyBw YXRjaCBnb2luZyB0byBtYWtlIGl0IHRvIGxpbnV4LW5leHQ/Cl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdAppb21tdUBsaXN0 cy5saW51eC1mb3VuZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRhdGlvbi5vcmcv bWFpbG1hbi9saXN0aW5mby9pb21tdQ==