From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 9BE51884 for ; Thu, 21 Jul 2016 10:31:14 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id E057F143 for ; Thu, 21 Jul 2016 10:31:11 +0000 (UTC) Message-ID: <1469097065.120686.124.camel@infradead.org> From: David Woodhouse To: Hannes Reinecke , Andy Lutomirski , "Wangnan (F)" Date: Thu, 21 Jul 2016 11:31:05 +0100 In-Reply-To: <028967b8-6107-9d9c-453a-a7f25e967f70@suse.com> References: <20160719034717.GA24189@swordfish> <535ebaec-1653-3077-d17b-feb847fd51d2@suse.com> <578EF192.3050808@huawei.com> <028967b8-6107-9d9c-453a-a7f25e967f70@suse.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Ur1pcoEPCBGDmpN8P7OK" Mime-Version: 1.0 Cc: "ksummit-discuss@lists.linuxfoundation.org" Subject: Re: [Ksummit-discuss] [TECH TOPIC] asynchronous printk List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-Ur1pcoEPCBGDmpN8P7OK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2016-07-21 at 07:59 +0200, Hannes Reinecke wrote: > > If we do all this stuff, can we also try to clean up earlyprintk a > > bit? The whole earlyconsole mechanism is a mess, and switching over > > to the non-early console is only somewhat functional. I'd love to see > > this all simplified: before there's any console at all available, just > > buffer messages. Then, when a console shows up, write the buffer out. > > Then earlyprintk can work just like regular printk. > >=20 > Begging the question how one would debug failures during that time. > The current earlyprintk stuff is at least able to print out _something_, > so that you have some idea what went wrong. > Without that things will become _really_ hard during board bringup. No, you don't actually *delay* the console output. You still register the console as soon as you physically can, but you just don't have all that nasty special-casing of the "earlyprintk" nonsense; you just make sure the standard console output is capable of working as early as you need it to. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-Ur1pcoEPCBGDmpN8P7OK Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEeAw ggXiMIIDyqADAgECAhBrp4p9CteI1lEK+Vnk57ThMA0GCSqGSIb3DQEBCwUAMH0xCzAJBgNVBAYT AklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0 aWZpY2F0ZSBTaWduaW5nMSkwJwYDVQQDEyBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 eTAeFw0xNTEyMTYwMTAwMDVaFw0zMDEyMTYwMTAwMDVaMHUxCzAJBgNVBAYTAklMMRYwFAYDVQQK Ew1TdGFydENvbSBMdGQuMSkwJwYDVQQLEyBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0 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