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Sat, 3 Mar 2018 17:38:18 -0500 Received: from mail-cys01nam02on0114.outbound.protection.outlook.com ([104.47.37.114]:41081 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934921AbeCCWiP (ORCPT ); Sat, 3 Mar 2018 17:38:15 -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 4.4 027/115] timers, sched_clock: Update timeout for clock wrap Thread-Topic: [PATCH AUTOSEL for 4.4 027/115] timers, sched_clock: Update timeout for clock wrap Thread-Index: AQHTsz9Qm+FGpUX5LUOGKrBOSo1BcA== Date: Sat, 3 Mar 2018 22:31:04 +0000 Message-ID: <20180303223010.27106-27-alexander.levin@microsoft.com> References: <20180303223010.27106-1-alexander.levin@microsoft.com> In-Reply-To: <20180303223010.27106-1-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;MW2PR2101MB1067;7:Xqz2I1D0pAdSjR1WDR9KpY9HpO/bG7dWMRRJeHZfPu2FUgxXszyyh1SIXe2VEcNwfQ4pNwqGCxgY6p31nC+G7qp1SDXozo67v632FNlADSMmFGqUI2h+CNSwDzKNIu8uPR1sxEZbilK1EoivE0xCrUjrGm6ZtfsGkkuSZpSBD4pBFE0efFx/LtIxtr9pL8L6GOxz8FmK893m5Bm/wKwQBcVAOashGDG1xTe+gdGzhuIhv7rEohc7RHJd1cDgItEw x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: d1325b57-e139-4893-2109-08d5815770e9 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1067; 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x-microsoft-antispam-message-info: 8C04L5urZRzqTqqMib/MxR3ENOSdrur5GMy2V0PtdjuuDDeXlt9cmVzOwiQJwDCIP+rKuhJ2fPdmv3kwzYBsSG2kU7OgG69Ot38pGBra5cV0YtmIniZ3tSoYwxzAGVb0LXOeTQCb5gAHoYkYqnutcSIJqCDLCbKJnVLhCQkZ78Y= 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: d1325b57-e139-4893-2109-08d5815770e9 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:31:04.4790 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1067 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 a26036d37a38..382b159d8592 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -205,6 +205,11 @@ sched_clock_register(u64 (*read)(void), int bits, unsi= gned long rate) =20 update_clock_read_data(&rd); =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