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Tue, 18 Feb 2020 18:27:09 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH] aio-posix: avoid reacquiring rcu_read_lock() when polling Date: Tue, 18 Feb 2020 18:27:08 +0000 Message-Id: <20200218182708.914552-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: BKdLrWRGOpuWMGFx7PSu9A-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: base64 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Paolo Bonzini , Stefan Hajnoczi , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" VGhlIGZpcnN0IHJjdV9yZWFkX2xvY2svdW5sb2NrKCkgaXMgZXhwZW5zaXZlLiAgTmVzdGVkIGNh bGxzIGFyZSBjaGVhcC4KClRoaXMgb3B0aW1pemF0aW9uIGluY3JlYXNlcyBJT1BTIGZyb20gNzNr IHRvIDE2Mmsgd2l0aCBhIExpbnV4IGd1ZXN0CnRoYXQgaGFzIDIgdmlydGlvLWJsayxudW0tcXVl dWVzPTEgYW5kIDk5IHZpcnRpby1ibGssbnVtLXF1ZXVlcz0zMgpkZXZpY2VzLgoKU2lnbmVkLW9m Zi1ieTogU3RlZmFuIEhham5vY3ppIDxzdGVmYW5oYUByZWRoYXQuY29tPgotLS0KIHV0aWwvYWlv LXBvc2l4LmMgfCAxMSArKysrKysrKysrKwogMSBmaWxlIGNoYW5nZWQsIDExIGluc2VydGlvbnMo KykKCmRpZmYgLS1naXQgYS91dGlsL2Fpby1wb3NpeC5jIGIvdXRpbC9haW8tcG9zaXguYwppbmRl eCBhNDk3N2Y1MzhlLi5mNjdmNWIzNGU5IDEwMDY0NAotLS0gYS91dGlsL2Fpby1wb3NpeC5jCisr KyBiL3V0aWwvYWlvLXBvc2l4LmMKQEAgLTE1LDYgKzE1LDcgQEAKIAogI2luY2x1ZGUgInFlbXUv b3NkZXAuaCIKICNpbmNsdWRlICJibG9jay9ibG9jay5oIgorI2luY2x1ZGUgInFlbXUvcmN1Lmgi CiAjaW5jbHVkZSAicWVtdS9yY3VfcXVldWUuaCIKICNpbmNsdWRlICJxZW11L3NvY2tldHMuaCIK ICNpbmNsdWRlICJxZW11L2N1dGlscy5oIgpAQCAtNTE0LDYgKzUxNSwxNiBAQCBzdGF0aWMgYm9v bCBydW5fcG9sbF9oYW5kbGVyc19vbmNlKEFpb0NvbnRleHQgKmN0eCwgaW50NjRfdCAqdGltZW91 dCkKICAgICBib29sIHByb2dyZXNzID0gZmFsc2U7CiAgICAgQWlvSGFuZGxlciAqbm9kZTsKIAor ICAgIC8qCisgICAgICogT3B0aW1pemF0aW9uOiAtPmlvX3BvbGwoKSBoYW5kbGVycyBvZnRlbiBj b250YWluIFJDVSByZWFkIGNyaXRpY2FsCisgICAgICogc2VjdGlvbnMgYW5kIHdlIHRoZXJlZm9y ZSBzZWUgbWFueSByY3VfcmVhZF9sb2NrKCkgLT4gcmN1X3JlYWRfdW5sb2NrKCkKKyAgICAgKiAt PiByY3VfcmVhZF9sb2NrKCkgLT4gLi4uIHNlcXVlbmNlcyB3aXRoIGV4cGVuc2l2ZSBtZW1vcnkK KyAgICAgKiBzeW5jaHJvbml6YXRpb24gcHJpbWl0aXZlcy4gIE1ha2UgdGhlIGVudGlyZSBwb2xs aW5nIGxvb3AgYW4gUkNVCisgICAgICogY3JpdGljYWwgc2VjdGlvbiBiZWNhdXNlIG5lc3RlZCBy Y3VfcmVhZF9sb2NrKCkvcmN1X3JlYWRfdW5sb2NrKCkgY2FsbHMKKyAgICAgKiBhcmUgY2hlYXAu CisgICAgICovCisgICAgUkNVX1JFQURfTE9DS19HVUFSRCgpOworCiAgICAgUUxJU1RfRk9SRUFD SF9SQ1Uobm9kZSwgJmN0eC0+YWlvX2hhbmRsZXJzLCBub2RlKSB7CiAgICAgICAgIGlmICghbm9k ZS0+ZGVsZXRlZCAmJiBub2RlLT5pb19wb2xsICYmCiAgICAgICAgICAgICBhaW9fbm9kZV9jaGVj ayhjdHgsIG5vZGUtPmlzX2V4dGVybmFsKSAmJgotLSAKMi4yNC4xCgo=