From mboxrd@z Thu Jan 1 00:00:00 1970 From: shuang.he@intel.com Subject: Re: [PATCH] drm: Make drm_read() more robust against multithreaded races Date: 04 Dec 2014 18:19:54 -0800 Message-ID: <71e320$en27kg@orsmga003.jf.intel.com> References: <1417727005-26301-1-git-send-email-chris@chris-wilson.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id D429A6E8B0 for ; Thu, 4 Dec 2014 18:23:23 -0800 (PST) In-Reply-To: <1417727005-26301-1-git-send-email-chris@chris-wilson.co.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: shuang.he@intel.com, intel-gfx@lists.freedesktop.org, chris@chris-wilson.co.uk List-Id: intel-gfx@lists.freedesktop.org VGVzdGVkLUJ5OiBQUkMgUUEgUFJUUyAoUGF0Y2ggUmVncmVzc2lvbiBUZXN0IFN5c3RlbSBDb250 YWN0OiBzaHVhbmcuaGVAaW50ZWwuY29tKQotLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tU3VtbWFyeS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0KUGxhdGZv cm0gICAgICAgICAgRGVsdGEgICAgICAgICAgZHJtLWludGVsLW5pZ2h0bHkgICAgICAgICAgU2Vy aWVzIEFwcGxpZWQKUE5WICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDM2NC8zNjQg ICAgICAgICAgICAgIDM2NC8zNjQKSUxLICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg IDM2Ni8zNjYgICAgICAgICAgICAgIDM2Ni8zNjYKU05CICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgIDQ1MC80NTAgICAgICAgICAgICAgIDQ1MC80NTAKSVZCICAgICAgICAgICAgICAr MTcgICAgICAgICAgICAgICAgIDQ4MS80OTggICAgICAgICAgICAgIDQ5OC80OTgKQllUICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgIDI4OS8yODkgICAgICAgICAgICAgIDI4OS8yODkK SFNXICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDU2NC81NjQgICAgICAgICAgICAg IDU2NC81NjQKQkRXICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIDQxNy80MTcgICAg ICAgICAgICAgIDQxNy80MTcKLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLURl dGFpbGVkLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQpQbGF0Zm9ybSAgVGVz dCAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgZHJtLWludGVsLW5pZ2h0bHkgICAgICAg ICAgU2VyaWVzIEFwcGxpZWQKIElWQiAgaWd0X2ttc18zZCAgICAgIERNRVNHX1dBUk4oMSwgTTM0 KVBBU1MoMTAsIE00TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNv cl9jcmNfY3Vyc29yLTEyOHgxMjgtb25zY3JlZW4gICAgICBOU1BUKDEsIE0zNClQQVNTKDEwLCBN NE0zNE0yMSkgICAgICBQQVNTKDEsIE0zNCkKIElWQiAgaWd0X2ttc19jdXJzb3JfY3JjX2N1cnNv ci0xMjh4MTI4LXJhbmRvbSAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAsIE00TTM0TTIxKSAgICAg IFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNvcl9jcmNfY3Vyc29yLTEyOHgxMjgtc2xp ZGluZyAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAsIE00TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0 KQogSVZCICBpZ3Rfa21zX2N1cnNvcl9jcmNfY3Vyc29yLTI1NngyNTYtb2Zmc2NyZWVuICAgICAg TlNQVCgxLCBNMzQpUEFTUygxMCwgTTRNMzRNMjEpICAgICAgUEFTUygxLCBNMzQpCiBJVkIgIGln dF9rbXNfY3Vyc29yX2NyY19jdXJzb3ItMjU2eDI1Ni1vbnNjcmVlbiAgICAgIE5TUFQoMSwgTTM0 KVBBU1MoMTAsIE00TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNv cl9jcmNfY3Vyc29yLTI1NngyNTYtc2xpZGluZyAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAsIE00 TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNvcl9jcmNfY3Vyc29y LTY0eDY0LW9mZnNjcmVlbiAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAsIE00TTM0TTIxKSAgICAg IFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNvcl9jcmNfY3Vyc29yLTY0eDY0LW9uc2Ny ZWVuICAgICAgTlNQVCgxLCBNMzQpUEFTUygxMCwgTTRNMzRNMjEpICAgICAgUEFTUygxLCBNMzQp CiBJVkIgIGlndF9rbXNfY3Vyc29yX2NyY19jdXJzb3ItNjR4NjQtcmFuZG9tICAgICAgTlNQVCgx LCBNMzQpUEFTUygxMCwgTTRNMzRNMjEpICAgICAgUEFTUygxLCBNMzQpCiBJVkIgIGlndF9rbXNf Y3Vyc29yX2NyY19jdXJzb3ItNjR4NjQtc2xpZGluZyAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAs IE00TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0KQogSVZCICBpZ3Rfa21zX2N1cnNvcl9jcmNfY3Vy c29yLXNpemUtY2hhbmdlICAgICAgTlNQVCgxLCBNMzQpUEFTUygxMCwgTTRNMzRNMjEpICAgICAg UEFTUygxLCBNMzQpCiBJVkIgIGlndF9rbXNfZmVuY2VfcGluX2xlYWsgICAgICBOU1BUKDEsIE0z NClQQVNTKDEwLCBNNE0zNE0yMSkgICAgICBQQVNTKDEsIE0zNCkKIElWQiAgaWd0X2ttc19tbWlv X3ZzX2NzX2ZsaXBfc2V0Y3J0Y192c19jc19mbGlwICAgICAgTlNQVCgxLCBNMzQpUEFTUygxMCwg TTRNMzRNMjEpICAgICAgUEFTUygxLCBNMzQpCiBJVkIgIGlndF9rbXNfbW1pb192c19jc19mbGlw X3NldHBsYW5lX3ZzX2NzX2ZsaXAgICAgICBOU1BUKDEsIE0zNClQQVNTKDEwLCBNNE0zNE0yMSkg ICAgICBQQVNTKDEsIE0zNCkKIElWQiAgaWd0X2ttc19yb3RhdGlvbl9jcmNfcHJpbWFyeS1yb3Rh dGlvbiAgICAgIE5TUFQoMSwgTTM0KVBBU1MoMTAsIE00TTM0TTIxKSAgICAgIFBBU1MoMSwgTTM0 KQogSVZCICBpZ3Rfa21zX3JvdGF0aW9uX2NyY19zcHJpdGUtcm90YXRpb24gICAgICBOU1BUKDEs IE0zNClQQVNTKDEwLCBNNE0zNE0yMSkgICAgICBQQVNTKDEsIE0zNCkKTm90ZTogWW91IG5lZWQg dG8gcGF5IG1vcmUgYXR0ZW50aW9uIHRvIGxpbmUgc3RhcnQgd2l0aCAnKicKX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlz dApJbnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHA6Ly9saXN0cy5mcmVlZGVza3Rv cC5vcmcvbWFpbG1hbi9saXN0aW5mby9pbnRlbC1nZngK