From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Message-ID: <1490089343.5036.92.camel@infradead.org> Subject: Re: [PATCH v33 00/14] add kdump support From: David Woodhouse In-Reply-To: <20170321073452.GA17298@linaro.org> References: <20170315095656.24992-1-takahiro.akashi@linaro.org> <1489750991.17202.40.camel@infradead.org> <1489759373.17202.44.camel@infradead.org> <20170317153358.GI5940@leverpostej> <1489765628.17202.59.camel@infradead.org> <20170317162421.GK5940@leverpostej> <20170321073452.GA17298@linaro.org> Date: Tue, 21 Mar 2017 09:42:23 +0000 Mime-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============6672142771003221339==" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: AKASHI Takahiro , Mark Rutland Cc: marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, geoff@infradead.org, james.morse@arm.com, bauerman@linux.vnet.ibm.com, dyoung@redhat.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org --===============6672142771003221339== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-46EU22rdctPVvPiY18j3" --=-46EU22rdctPVvPiY18j3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2017-03-21 at 16:34 +0900, AKASHI Takahiro wrote: > Yes, it is intentional. I removed 'offline' code in my v14 (2016/3/4). > As you assumed, I'd expect 'online' status of all CPUs to be kept > unchanged in the core dump. I wonder if it would be better to take a *copy* of it and put it back after we're done taking the CPUs down? As things stand, we now have *three* different methods of taking down all the CPUs... and *none* of them allow a platform to override it with an NMI-based or STONITH-based=20 method, which seems like something of an oversight. > If you can agree, I would like to modify this disputed warning code to: >=C2=A0 > + BUG_ON(!in_kexec_crash && (stuck_cpus || (num_online_cpus() > 1))); > + WARN(in_kexec_crash && (stuck_cpus || smp_crash_stop_failed()), > + "Some CPUs may be stale, kdump will be unreliable.\n"); That works; thanks. FWIW I'm currently blaming my platform's firmware for my sporadic crash-on-CPU#1 failures. If your testing includes crashes on non-boot CPUs (perhaps using the sysrq hack I posted) and it reliably passes for you, then let's ignore that for now. --=-46EU22rdctPVvPiY18j3 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDzUw ggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQswCQYDVQQG EwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRU UCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTE0MTIyMjAw MDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1h bmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMUEw PwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBF bWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAImxDdp6UxlOcFIdvFamBia3 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