From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C535C48BE5 for ; Tue, 15 Jun 2021 19:54:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD8CF61185 for ; Tue, 15 Jun 2021 19:54:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230351AbhFOT4t (ORCPT ); Tue, 15 Jun 2021 15:56:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:35190 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229898AbhFOT4s (ORCPT ); Tue, 15 Jun 2021 15:56:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E60A16128B; Tue, 15 Jun 2021 19:54:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623786883; bh=W1xnnWvWsJfJPutiRyGO1n1B7NplEf1u/yklRr5NuJs=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=tK5G9DrjviDXt2s70irKKqTA9hgoFMYoOFnF8ATDkHvg2PmBhonYuP82rHCvzgnJB HBIrJR9A5eRMDWmjWc687AfWae0aY7aUWQJvk7zkUBoLc0Poj3PMgXYTfXUI28FiaR pqbPV66AfCWwwOt0U1qF9G5+NJZDAKnaNA801ttoZkOar24ORxLgqzScTm8kZgjZPn lvGVvRQrThm282fQcpBinnH7UboackJu9fQwSiDhJ3mO0+QBDdZHl+2MQrBe55L9io UCyIOI6XGeIerYLbs8PUnLexN0gnj4o14X0fm86pr+OPqRJZoDqpO4BGJiBQApM2fe H5LWtm921ip3Q== Received: by mail-ej1-f49.google.com with SMTP id ce15so24427323ejb.4; Tue, 15 Jun 2021 12:54:43 -0700 (PDT) X-Gm-Message-State: AOAM532GhUNHP0lisTZUFy4HX6g8v/MpGPGdVkVmst+jKrks8xH7v5hW nsZeXgj20vzabos6K7NNyEulNV1W1oB7FESX1A== X-Google-Smtp-Source: ABdhPJws6EJc3AHI9SCrC49CmDB2SKmyNaBg1CnISwWPlKJmd/mj1fUa/9RW04SrT9zPSts7jNSN1kgXP2Sdl9DBSy8= X-Received: by 2002:a17:906:9419:: with SMTP id q25mr1314651ejx.341.1623786882557; Tue, 15 Jun 2021 12:54:42 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Rob Herring Date: Tue, 15 Jun 2021 13:54:30 -0600 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 2/3] riscv: Remove non-standard linux,elfcorehdr handling To: Nick Kossifidis Cc: Geert Uytterhoeven , Paul Walmsley , Palmer Dabbelt , Albert Ou , Frank Rowand , Catalin Marinas , Will Deacon , devicetree@vger.kernel.org, linux-riscv , linux-arm-kernel , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 15, 2021 at 12:40 PM Nick Kossifidis wrote: > > =CE=A3=CF=84=CE=B9=CF=82 2021-06-15 21:17, Geert Uytterhoeven =CE=AD=CE= =B3=CF=81=CE=B1=CF=88=CE=B5: > > RISC-V uses platform-specific code to locate the elf core header in > > memory. However, this does not conform to the standard > > "linux,elfcorehdr" DT bindings, as it relies on a reserved memory node > > with the "linux,elfcorehdr" compatible value, instead of on a > > "linux,elfcorehdr" property under the "/chosen" node. > > > > The non-compliant code can just be removed, as the standard behavior is > > already implemented by platform-agnostic handling in the FDT core code. > > > > Fixes: 5640975003d0234d ("RISC-V: Add crash kernel support") > > Signed-off-by: Geert Uytterhoeven > > NACK > > There is nothing standard about "linux,elfcorehdr", it's an It is and it is documented which is more than we can say for "linux,elfcorehdr" as a node. > arm64-specific property on /chosen and it's suboptimal, it gets the > addr/length of ELF core of the previous kernel through that property and > then goes on to reserve that region at: > https://elixir.bootlin.com/linux/v5.13-rc6/source/arch/arm64/mm/init.c#L1= 55 > > Why on earth is this cleaner than just defining a reserved-region in the > first place (a standard binding) with and hook up a callback with > RESERVEDMEM_OF_DECLARE for it to also initialize elfcorehdr_addr/size ? > If you don't like the compatible string I'm ok to change it, but this > patch breaks kdump on riscv since that region won't be reserved any more > and kernel will corrupt it. I might agree if we were designing this all from scratch, but we're not. We've got powerpc doing /memreserve/ + kernel cmdline, arm64 using chosen, and RiscV a 3rd way. What happens when/if RiscV wants to add an IMA buffer? That's no different than this case. The 2 architectures supporting it both use /chosen. Specifying an initrd is no different either. Rob From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 593A2C48BE5 for ; Tue, 15 Jun 2021 22:22:30 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0D9A5611C0 for ; Tue, 15 Jun 2021 22:22:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D9A5611C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBKdW4gMTUsIDIwMjEgYXQgMTI6NDAgUE0gTmljayBLb3NzaWZpZGlzIDxtaWNrQGlj cy5mb3J0aC5ncj4gd3JvdGU6Cj4KPiDOo8+EzrnPgiAyMDIxLTA2LTE1IDIxOjE3LCBHZWVydCBV eXR0ZXJob2V2ZW4gzq3Os8+BzrHPiM61Ogo+ID4gUklTQy1WIHVzZXMgcGxhdGZvcm0tc3BlY2lm aWMgY29kZSB0byBsb2NhdGUgdGhlIGVsZiBjb3JlIGhlYWRlciBpbgo+ID4gbWVtb3J5LiAgSG93 ZXZlciwgdGhpcyBkb2VzIG5vdCBjb25mb3JtIHRvIHRoZSBzdGFuZGFyZAo+ID4gImxpbnV4LGVs ZmNvcmVoZHIiIERUIGJpbmRpbmdzLCBhcyBpdCByZWxpZXMgb24gYSByZXNlcnZlZCBtZW1vcnkg bm9kZQo+ID4gd2l0aCB0aGUgImxpbnV4LGVsZmNvcmVoZHIiIGNvbXBhdGlibGUgdmFsdWUsIGlu c3RlYWQgb2Ygb24gYQo+ID4gImxpbnV4LGVsZmNvcmVoZHIiIHByb3BlcnR5IHVuZGVyIHRoZSAi L2Nob3NlbiIgbm9kZS4KPiA+Cj4gPiBUaGUgbm9uLWNvbXBsaWFudCBjb2RlIGNhbiBqdXN0IGJl IHJlbW92ZWQsIGFzIHRoZSBzdGFuZGFyZCBiZWhhdmlvciBpcwo+ID4gYWxyZWFkeSBpbXBsZW1l bnRlZCBieSBwbGF0Zm9ybS1hZ25vc3RpYyBoYW5kbGluZyBpbiB0aGUgRkRUIGNvcmUgY29kZS4K PiA+Cj4gPiBGaXhlczogNTY0MDk3NTAwM2QwMjM0ZCAoIlJJU0MtVjogQWRkIGNyYXNoIGtlcm5l bCBzdXBwb3J0IikKPiA+IFNpZ25lZC1vZmYtYnk6IEdlZXJ0IFV5dHRlcmhvZXZlbiA8Z2VlcnQr cmVuZXNhc0BnbGlkZXIuYmU+Cj4KPiBOQUNLCj4KPiBUaGVyZSBpcyBub3RoaW5nIHN0YW5kYXJk IGFib3V0ICJsaW51eCxlbGZjb3JlaGRyIiwgaXQncyBhbgoKSXQgaXMgYW5kIGl0IGlzIGRvY3Vt ZW50ZWQgd2hpY2ggaXMgbW9yZSB0aGFuIHdlIGNhbiBzYXkgZm9yCiJsaW51eCxlbGZjb3JlaGRy IiBhcyBhIG5vZGUuCgo+IGFybTY0LXNwZWNpZmljIHByb3BlcnR5IG9uIC9jaG9zZW4gYW5kIGl0 J3Mgc3Vib3B0aW1hbCwgaXQgZ2V0cyB0aGUKPiBhZGRyL2xlbmd0aCBvZiBFTEYgY29yZSBvZiB0 aGUgcHJldmlvdXMga2VybmVsIHRocm91Z2ggdGhhdCBwcm9wZXJ0eSBhbmQKPiB0aGVuIGdvZXMg b24gdG8gcmVzZXJ2ZSB0aGF0IHJlZ2lvbiBhdDoKPiBodHRwczovL2VsaXhpci5ib290bGluLmNv bS9saW51eC92NS4xMy1yYzYvc291cmNlL2FyY2gvYXJtNjQvbW0vaW5pdC5jI0wxNTUKPgo+IFdo eSBvbiBlYXJ0aCBpcyB0aGlzIGNsZWFuZXIgdGhhbiBqdXN0IGRlZmluaW5nIGEgcmVzZXJ2ZWQt cmVnaW9uIGluIHRoZQo+IGZpcnN0IHBsYWNlIChhIHN0YW5kYXJkIGJpbmRpbmcpIHdpdGggYW5k IGhvb2sgdXAgYSBjYWxsYmFjayB3aXRoCj4gUkVTRVJWRURNRU1fT0ZfREVDTEFSRSBmb3IgaXQg dG8gYWxzbyBpbml0aWFsaXplIGVsZmNvcmVoZHJfYWRkci9zaXplID8KPiBJZiB5b3UgZG9uJ3Qg bGlrZSB0aGUgY29tcGF0aWJsZSBzdHJpbmcgSSdtIG9rIHRvIGNoYW5nZSBpdCwgYnV0IHRoaXMK PiBwYXRjaCBicmVha3Mga2R1bXAgb24gcmlzY3Ygc2luY2UgdGhhdCByZWdpb24gd29uJ3QgYmUg cmVzZXJ2ZWQgYW55IG1vcmUKPiBhbmQga2VybmVsIHdpbGwgY29ycnVwdCBpdC4KCkkgbWlnaHQg YWdyZWUgaWYgd2Ugd2VyZSBkZXNpZ25pbmcgdGhpcyBhbGwgZnJvbSBzY3JhdGNoLCBidXQgd2Un cmUKbm90LiBXZSd2ZSBnb3QgcG93ZXJwYyBkb2luZyAvbWVtcmVzZXJ2ZS8gKyBrZXJuZWwgY21k bGluZSwgYXJtNjQKdXNpbmcgY2hvc2VuLCBhbmQgUmlzY1YgYSAzcmQgd2F5LgoKV2hhdCBoYXBw ZW5zIHdoZW4vaWYgUmlzY1Ygd2FudHMgdG8gYWRkIGFuIElNQSBidWZmZXI/IFRoYXQncyBubwpk aWZmZXJlbnQgdGhhbiB0aGlzIGNhc2UuIFRoZSAyIGFyY2hpdGVjdHVyZXMgc3VwcG9ydGluZyBp dCBib3RoIHVzZQovY2hvc2VuLiBTcGVjaWZ5aW5nIGFuIGluaXRyZCBpcyBubyBkaWZmZXJlbnQg ZWl0aGVyLgoKUm9iCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3Rz LmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5m by9saW51eC1hcm0ta2VybmVsCg==