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Tue, 03 Aug 2021 00:46:13 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyEvOW/oPitztnM44QtOEHatfCeA16JROutkQDb3a25VjV+JgBNuHrwDZ3buALcITz8Iapu0g== X-Received: by 2002:a17:90a:7065:: with SMTP id f92mr3190595pjk.16.1627976773095; Tue, 03 Aug 2021 00:46:13 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id f1sm7278948pfk.115.2021.08.03.00.46.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Aug 2021 00:46:12 -0700 (PDT) Subject: Re: [PATCH v10 02/17] file: Export receive_fd() to modules To: Xie Yongji , mst@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com, joro@8bytes.org, gregkh@linuxfoundation.org, zhe.he@windriver.com, xiaodong.liu@intel.com, joe@perches.com References: <20210729073503.187-1-xieyongji@bytedance.com> <20210729073503.187-3-xieyongji@bytedance.com> From: Jason Wang Message-ID: Date: Tue, 3 Aug 2021 15:45:59 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <20210729073503.187-3-xieyongji@bytedance.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Cc: kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, iommu@lists.linux-foundation.org, songmuchun@bytedance.com, linux-fsdevel@vger.kernel.org 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="gbk"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" CtTaIDIwMjEvNy8yOSDPws7nMzozNCwgWGllIFlvbmdqaSDQtLXAOgo+IEV4cG9ydCByZWNlaXZl X2ZkKCkgc28gdGhhdCBzb21lIG1vZHVsZXMgY2FuIHVzZQo+IGl0IHRvIHBhc3MgZmlsZSBkZXNj cmlwdG9yIGJldHdlZW4gcHJvY2Vzc2VzIHdpdGhvdXQKPiBtaXNzaW5nIGFueSBzZWN1cml0eSBz dHVmZnMuCj4KPiBTaWduZWQtb2ZmLWJ5OiBYaWUgWW9uZ2ppIDx4aWV5b25namlAYnl0ZWRhbmNl LmNvbT4KPiAtLS0KPiAgIGZzL2ZpbGUuYyAgICAgICAgICAgIHwgNiArKysrKysKPiAgIGluY2x1 ZGUvbGludXgvZmlsZS5oIHwgNyArKystLS0tCj4gICAyIGZpbGVzIGNoYW5nZWQsIDkgaW5zZXJ0 aW9ucygrKSwgNCBkZWxldGlvbnMoLSkKPgo+IGRpZmYgLS1naXQgYS9mcy9maWxlLmMgYi9mcy9m aWxlLmMKPiBpbmRleCA4NmRjOTk1NmFmMzIuLjIxMGU1NDA2NzJhYSAxMDA2NDQKPiAtLS0gYS9m cy9maWxlLmMKPiArKysgYi9mcy9maWxlLmMKPiBAQCAtMTEzNCw2ICsxMTM0LDEyIEBAIGludCBy ZWNlaXZlX2ZkX3JlcGxhY2UoaW50IG5ld19mZCwgc3RydWN0IGZpbGUgKmZpbGUsIHVuc2lnbmVk IGludCBvX2ZsYWdzKQo+ICAgCXJldHVybiBuZXdfZmQ7Cj4gICB9Cj4gICAKPiAraW50IHJlY2Vp dmVfZmQoc3RydWN0IGZpbGUgKmZpbGUsIHVuc2lnbmVkIGludCBvX2ZsYWdzKQo+ICt7Cj4gKwly ZXR1cm4gX19yZWNlaXZlX2ZkKGZpbGUsIE5VTEwsIG9fZmxhZ3MpOwoKCkFueSByZWFzb24gdGhh dCByZWNlaXZlX2ZkX3VzZXIoKSBjYW4gbGl2ZSBpbiB0aGUgZmlsZS5oPwoKVGhhbmtzCgoKPiAr fQo+ICtFWFBPUlRfU1lNQk9MX0dQTChyZWNlaXZlX2ZkKTsKPiArCj4gICBzdGF0aWMgaW50IGtz eXNfZHVwMyh1bnNpZ25lZCBpbnQgb2xkZmQsIHVuc2lnbmVkIGludCBuZXdmZCwgaW50IGZsYWdz KQo+ICAgewo+ICAgCWludCBlcnIgPSAtRUJBREY7Cj4gZGlmZiAtLWdpdCBhL2luY2x1ZGUvbGlu dXgvZmlsZS5oIGIvaW5jbHVkZS9saW51eC9maWxlLmgKPiBpbmRleCAyZGUyZTQ2MTNkN2IuLjUx ZTgzMGI0ZmUzYSAxMDA2NDQKPiAtLS0gYS9pbmNsdWRlL2xpbnV4L2ZpbGUuaAo+ICsrKyBiL2lu Y2x1ZGUvbGludXgvZmlsZS5oCj4gQEAgLTk0LDYgKzk0LDkgQEAgZXh0ZXJuIHZvaWQgZmRfaW5z dGFsbCh1bnNpZ25lZCBpbnQgZmQsIHN0cnVjdCBmaWxlICpmaWxlKTsKPiAgIAo+ICAgZXh0ZXJu IGludCBfX3JlY2VpdmVfZmQoc3RydWN0IGZpbGUgKmZpbGUsIGludCBfX3VzZXIgKnVmZCwKPiAg IAkJCXVuc2lnbmVkIGludCBvX2ZsYWdzKTsKPiArCj4gK2V4dGVybiBpbnQgcmVjZWl2ZV9mZChz dHJ1Y3QgZmlsZSAqZmlsZSwgdW5zaWduZWQgaW50IG9fZmxhZ3MpOwo+ICsKPiAgIHN0YXRpYyBp bmxpbmUgaW50IHJlY2VpdmVfZmRfdXNlcihzdHJ1Y3QgZmlsZSAqZmlsZSwgaW50IF9fdXNlciAq dWZkLAo+ICAgCQkJCSAgdW5zaWduZWQgaW50IG9fZmxhZ3MpCj4gICB7Cj4gQEAgLTEwMSwxMCAr MTA0LDYgQEAgc3RhdGljIGlubGluZSBpbnQgcmVjZWl2ZV9mZF91c2VyKHN0cnVjdCBmaWxlICpm aWxlLCBpbnQgX191c2VyICp1ZmQsCj4gICAJCXJldHVybiAtRUZBVUxUOwo+ICAgCXJldHVybiBf X3JlY2VpdmVfZmQoZmlsZSwgdWZkLCBvX2ZsYWdzKTsKPiAgIH0KPiAtc3RhdGljIGlubGluZSBp bnQgcmVjZWl2ZV9mZChzdHJ1Y3QgZmlsZSAqZmlsZSwgdW5zaWduZWQgaW50IG9fZmxhZ3MpCj4g LXsKPiAtCXJldHVybiBfX3JlY2VpdmVfZmQoZmlsZSwgTlVMTCwgb19mbGFncyk7Cj4gLX0KPiAg IGludCByZWNlaXZlX2ZkX3JlcGxhY2UoaW50IG5ld19mZCwgc3RydWN0IGZpbGUgKmZpbGUsIHVu c2lnbmVkIGludCBvX2ZsYWdzKTsKPiAgIAo+ICAgZXh0ZXJuIHZvaWQgZmx1c2hfZGVsYXllZF9m cHV0KHZvaWQpOwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KaW9tbXUgbWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0 dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11