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Sat, 3 Mar 2018 17:53:29 -0500 Received: from mail-by2nam01on0095.outbound.protection.outlook.com ([104.47.34.95]:48488 "EHLO NAM01-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S935051AbeCCWlG (ORCPT ); Sat, 3 Mar 2018 17:41:06 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: David Engraf , John Stultz , Sasha Levin Subject: [PATCH AUTOSEL for 3.18 17/63] timers, sched_clock: Update timeout for clock wrap Thread-Topic: [PATCH AUTOSEL for 3.18 17/63] timers, sched_clock: Update timeout for clock wrap Thread-Index: AQHTsz+hFQG7EZSACka233XpuxcXDw== Date: Sat, 3 Mar 2018 22:33:19 +0000 Message-ID: <20180303223228.27323-17-alexander.levin@microsoft.com> References: <20180303223228.27323-1-alexander.levin@microsoft.com> In-Reply-To: <20180303223228.27323-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MW2PR2101MB0940;6:Jcgg/ATDmN64YmGhfnoYOU4k6ce/UYZuC5GMK00bXzj381UtBJclZC30owSH9biFi1RQkahpL/A0RgjEadHAiPCszFmo6cLNfp6pJOcvrt52YgwPQvhQgzlBD7VIPfxphrVuaFni9hPFVgv6OJhqNvw/P9wG/fmYqyMOhzmh/zsBdEzWVGtgkpmUyregMCzAxm3LT43XRsEaDXKVICgpd8ZCYAQyKZ7y7IRYT4y/4YTIJvAdSSWSgNa62RKCPafonTzL+I+8QiZVxZtDMMBeeK2nZDmhrVG9ermjKpg+5ZGxwyaDxLIpGmfo0YaIVH1syUs62BFAriJRekPT/qlyTXn2HyYE6jpSMAxWmbkxyCSFgqP6rDKS5nhH+Dhh4SK5;5:/oEzbIt+h2M1BiCQZN0u89PV2ufhBQf+bcVRtivTHl43oxySLfaZrF2XcbiFrrFfYpCYZW2RDBqHhL8HgiTIl+g9jpL299gFrWggUMO9bv4BRH/pBI05fliQadxJ9b+8BD8qyLn4LJz5EHMpIthWXWpXIL+NiTPcjrFsom1jSFI=;24:vWxZE4rLuBWNP5ffz33kXlpN+xgnj1i2vyzaCrbBsBBRs91LJOeyRPrHMWb6i3CQuSqiXv0b8VMVUCCnroKHwTWdgV8DyNv5UBOOtAPiICk=;7:nG+wHcTjR2lcxkCo3PUsvWczeJQtSCJA/Cs+U3IUdRW1Lfaia16+08HyXTTvJARDQTWSgn9vy76imuMjPCP/2UsNYyGo4G4KuZ6M3NTLiVGPB6mYEPyGa3+CKOFJ6DWhLCMh7KA85BfGhOMmAFsodwpydB2D6DLbUxDqjFQXqKs71jhKi9E94yonfSdUr281PDoCq0+jMQWChVMm6yq/VXcy3iiIKIjB7Zb6AxerWCaw/13/0FTYKBh0AaOJiF1O x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 32eb0266-d2ae-4f73-8bd5-08d58157d8d6 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603307)(7193020);SRVR:MW2PR2101MB0940; 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x-microsoft-antispam-message-info: XCyZQ3SZUWyfIdE3BV/RKnT6HHPxkwOPTocARuar6WNvtVRKgHY09u4lh+M18AyInq8KYhHFECE45PH2R9hwchpuKRQGbW09Ixag/c4etg5ik+eVSJd7aZ4DRVyLcSlHb6af4sqM/xOpvDSXoJAmNSqtUGsAymsXjSBDik3warQ= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 32eb0266-d2ae-4f73-8bd5-08d58157d8d6 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:33:19.2628 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB0940 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: David Engraf [ Upstream commit 1b8955bc5ac575009835e371ae55e7f3af2197a9 ] The scheduler clock framework may not use the correct timeout for the clock wrap. This happens when a new clock driver calls sched_clock_register() after the kernel called sched_clock_postinit(). In this case the clock wrap timeout is too long thus sched_clock_poll() is called too late and the cloc= k already wrapped. On my ARM system the scheduler was no longer scheduling any other task than the idle task because the sched_clock() wrapped. Signed-off-by: David Engraf Signed-off-by: John Stultz Signed-off-by: Sasha Levin --- kernel/time/sched_clock.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c index 01d2d15aa662..830e214f372c 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -146,6 +146,11 @@ void __init sched_clock_register(u64 (*read)(void), in= t bits, cd.epoch_ns =3D ns; raw_write_seqcount_end(&cd.seq); =20 + if (sched_clock_timer.function !=3D NULL) { + /* update timeout for clock wrap */ + hrtimer_start(&sched_clock_timer, cd.wrap_kt, HRTIMER_MODE_REL); + } + r =3D rate; if (r >=3D 4000000) { r /=3D 1000000; --=20 2.14.1