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Piccoli" , Michael Ellerman , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 073/219] powerpc/xmon: Fix an unexpected xmon on/off state change Thread-Topic: [PATCH AUTOSEL for 4.9 073/219] powerpc/xmon: Fix an unexpected xmon on/off state change Thread-Index: AQHTsz75CoISJE7/yUKW1CHc8PSZaA== Date: Sat, 3 Mar 2018 22:28:38 +0000 Message-ID: <20180303222716.26640-73-alexander.levin@microsoft.com> References: <20180303222716.26640-1-alexander.levin@microsoft.com> In-Reply-To: <20180303222716.26640-1-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;MW2PR2101MB1097;7:V+bR9NyuDjz5lGK1Z9aoJUtnQF4eQSdkaXXnDeC2UliLE4G+hU6Ou0C3/Rr/Q/I/AFbhnpq8C9n/hDr7NIZnvUK10TLQdcUBu0Eijt8EU7jeVFXiJXBGwsG+dWvULY9eG/10fcWz1v+J97uTjKEN3O1UjcHlZUHj6NswWtJwod+x/+DothN0pFZY4rCU/Dtw+k/LjNLpPHK1mXqCV64G0JDkU0NsmYk5tyTWGBlF9mE04tvgB0me3cWJG9UqEvH+ x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 8c4efbee-23a7-4e2b-0684-08d58156b5be x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1097; x-ms-traffictypediagnostic: MW2PR2101MB1097: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171)(104084551191319); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040501)(2401047)(5005006)(8121501046)(10201501046)(3002001)(3231220)(944501244)(52105095)(93006095)(93001095)(6055026)(61426038)(61427038)(6041288)(20161123560045)(20161123558120)(20161123562045)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123564045)(6072148)(201708071742011);SRVR:MW2PR2101MB1097;BCL:0;PCL:0;RULEID:;SRVR:MW2PR2101MB1097; x-forefront-prvs: 0600F93FE1 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(376002)(366004)(39380400002)(396003)(39860400002)(346002)(189003)(199004)(305945005)(105586002)(36756003)(3660700001)(86362001)(575784001)(6666003)(66066001)(2900100001)(5660300001)(8676002)(10090500001)(81166006)(81156014)(8936002)(22452003)(10290500003)(2950100002)(4326008)(25786009)(5250100002)(2501003)(68736007)(7736002)(72206003)(14454004)(478600001)(186003)(110136005)(26005)(316002)(2906002)(97736004)(6512007)(99286004)(107886003)(54906003)(1076002)(6506007)(106356001)(53936002)(59450400001)(6116002)(3846002)(102836004)(6486002)(86612001)(3280700002)(6436002)(76176011)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:MW2PR2101MB1097;H:MW2PR2101MB1034.namprd21.prod.outlook.com;FPR:;SPF:None;PTR:InfoNoRecords;MX:1;A:1;LANG:en; x-microsoft-antispam-message-info: 9XpJueSRzQg/Z8p5xCZYgIxGTpS7vjYLOzOuNz4R7HSYNpILW0NCVXC52DW4EWB7IXF9wmnEePoRCdd2dFrOZgNJq+96BmFC8Yv2aMQDrKtNuiQmp68aYtlH/KVyvt90M1ShwMTQBm4oUpFafhlsB8tUUtWvDfxMOdkdt5U27gc= 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: 8c4efbee-23a7-4e2b-0684-08d58156b5be X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:28:38.3538 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1097 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: Pan Xinhui [ Upstream commit 3b5bf42b81d56085fd58692b5117f69aa77fdff7 ] Once xmon is triggered by sysrq-x, it is enabled always afterwards even if it is disabled during boot. This will cause a system reset interrupt fail to dump. So keep xmon in its original state after exit. We have several ways to set xmon on or off. 1) by a build config CONFIG_XMON_DEFAULT. 2) by a boot cmdline with xmon or xmon=3Dearly or xmon=3Don to enable xmon and xmon=3Doff to disable xmon. This value will override that in step 1. 3) by a debugfs interface, as proposed in this patchset. And this value can override those in step 1 and 2. Signed-off-by: Pan Xinhui Signed-off-by: Guilherme G. Piccoli Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/xmon/xmon.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 760545519a0b..b975a256e606 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -74,6 +74,7 @@ static int xmon_gate; #endif /* CONFIG_SMP */ =20 static unsigned long in_xmon __read_mostly =3D 0; +static int xmon_on =3D IS_ENABLED(CONFIG_XMON_DEFAULT); =20 static unsigned long adrs; static int size =3D 1; @@ -3244,6 +3245,8 @@ static void sysrq_handle_xmon(int key) /* ensure xmon is enabled */ xmon_init(1); debugger(get_irq_regs()); + if (!xmon_on) + xmon_init(0); } =20 static struct sysrq_key_op sysrq_xmon_op =3D { @@ -3260,7 +3263,7 @@ static int __init setup_xmon_sysrq(void) __initcall(setup_xmon_sysrq); #endif /* CONFIG_MAGIC_SYSRQ */ =20 -static int __initdata xmon_early, xmon_off; +static int __initdata xmon_early; =20 static int __init early_parse_xmon(char *p) { @@ -3268,10 +3271,12 @@ static int __init early_parse_xmon(char *p) /* just "xmon" is equivalent to "xmon=3Dearly" */ xmon_init(1); xmon_early =3D 1; - } else if (strncmp(p, "on", 2) =3D=3D 0) + xmon_on =3D 1; + } else if (strncmp(p, "on", 2) =3D=3D 0) { xmon_init(1); - else if (strncmp(p, "off", 3) =3D=3D 0) - xmon_off =3D 1; + xmon_on =3D 1; + } else if (strncmp(p, "off", 3) =3D=3D 0) + xmon_on =3D 0; else if (strncmp(p, "nobt", 4) =3D=3D 0) xmon_no_auto_backtrace =3D 1; else @@ -3283,10 +3288,8 @@ early_param("xmon", early_parse_xmon); =20 void __init xmon_setup(void) { -#ifdef CONFIG_XMON_DEFAULT - if (!xmon_off) + if (xmon_on) xmon_init(1); -#endif if (xmon_early) debugger(NULL); } --=20 2.14.1