From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f53.google.com (mail-wm1-f53.google.com [209.85.128.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 797BA1866 for ; Thu, 2 Mar 2023 07:57:21 +0000 (UTC) Received: by mail-wm1-f53.google.com with SMTP id l7-20020a05600c4f0700b003e79fa98ce1so954374wmq.2 for ; Wed, 01 Mar 2023 23:57:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; t=1677743839; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=3gGlmdrxpk12L0HtiU5R9bJeUayhxQ74GXgfAq6meuw=; b=pn+DJn+k9uImMGeBMXuwnMQE1biMNzy71Plo8H7DOI3fKK/ceps9rgGUxc/bmw8s6L 4TQMSud9TXFc8/r2OEOEiAKv5SApxcJ1Yd/LQHA0imhiw3qi8hrsJYLIdS7LaNAmBH1O AbgLlGVWFn2hf8BkmR90At5+g3zqQ61Ankq9cGuBB9WgQfAsyn4JZulcRbW71gf7ZeYz oRP4F6/LxUTL9nxCbjnWUdwQSV0fTcnbx/sIcDMk8fB8xQ9dJ6UAQMnDD3HBbCn+Qr4a fIykdIwuX5WmEnYpwkBvfu6oXc7MDCcdwlfNYOa5JGNIdVdo8Hubuxh+Kfco99U7Z89i QfaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677743839; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=3gGlmdrxpk12L0HtiU5R9bJeUayhxQ74GXgfAq6meuw=; b=ufFSrYBXApih24Feqn9eWy5Iwb9dZPxRk9JW4S7VwWbhv9EWxhPDGvD4xTrHVHxgxw HBzVdvmZvjmimfgWYH7ckZyHo5hM8Z031BzevQqDDnLc3n06/Boqg+rtK0UaQqtI8KBZ dNueMyT/rQcNre1NlMzODrAFAAIP+M3kr7f7VJ3hUTFc6QsBiB8BBIch6zSDBw/kByPQ ljSpKaEO4nykloWaQA/u0iPn8EEI5pzzaroJMFoSLiKkb9H5QEgBNqywz+g/SlfnA7q0 tB6OgSjuuhX0cj8O584aqsZO2uuf+WZAuRankPv38A0pklD7En04X0loXmuFo7FzHQay gWIg== X-Gm-Message-State: AO0yUKVLtp/BdYugEdHFZnjrHQWIVr/kuUWgKNnx3M31cU1uR8jlweVf dohf3+9QJb+ZVGkzxrx67be+FxiwurmyQLW0pD+xRA== X-Google-Smtp-Source: AK7set8WtHYe+gEo1Fgs1pSlJqsnM2tCvgsXzdB6/J3n+P8FnRw3jetc5Yrjj9TAlqQSjPmyeFZCYlu44lotg0az/Sk= X-Received: by 2002:a05:600c:4591:b0:3ea:8ed9:8e4b with SMTP id r17-20020a05600c459100b003ea8ed98e4bmr2655128wmo.6.1677743839531; Wed, 01 Mar 2023 23:57:19 -0800 (PST) Precedence: bulk X-Mailing-List: loongarch@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: In-Reply-To: From: Alexandre Ghiti Date: Thu, 2 Mar 2023 08:57:08 +0100 Message-ID: Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi To: Palmer Dabbelt Cc: hca@linux.ibm.com, geert@linux-m68k.org, corbet@lwn.net, Richard Henderson , ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, Catalin Marinas , Will Deacon , chenhuacai@kernel.org, kernel@xen0n.name, monstr@monstr.eu, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, Paul Walmsley , aou@eecs.berkeley.edu, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, Arnd Bergmann , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, Mar 2, 2023 at 4:17=E2=80=AFAM Palmer Dabbelt = wrote: > > On Tue, 14 Feb 2023 01:19:02 PST (-0800), hca@linux.ibm.com wrote: > > On Tue, Feb 14, 2023 at 09:58:17AM +0100, Geert Uytterhoeven wrote: > >> Hi Heiko, > >> > >> On Tue, Feb 14, 2023 at 9:39 AM Heiko Carstens wro= te: > >> > On Tue, Feb 14, 2023 at 08:49:01AM +0100, Alexandre Ghiti wrote: > >> > > This all came up in the context of increasing COMMAND_LINE_SIZE in= the > >> > > RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE = is the > >> > > maximum length of /proc/cmdline and userspace could staticly rely = on > >> > > that to be correct. > >> > > > >> > > Usually I wouldn't mess around with changing this sort of thing, b= ut > >> > > PowerPC increased it with a5980d064fe2 ("powerpc: Bump COMMAND_LIN= E_SIZE > >> > > to 2048"). There are also a handful of examples of COMMAND_LINE_S= IZE > >> > > increasing, but they're from before the UAPI split so I'm not quit= e sure > >> > > what that means: e5a6a1c90948 ("powerpc: derive COMMAND_LINE_SIZE = from > >> > > asm-generic"), 684d2fd48e71 ("[S390] kernel: Append scpdata to ker= nel > >> > > boot command line"), 22242681cff5 ("MIPS: Extend COMMAND_LINE_SIZE= "), > >> > > and 2b74b85693c7 ("sh: Derive COMMAND_LINE_SIZE from > >> > > asm-generic/setup.h."). > >> > > > >> > > It seems to me like COMMAND_LINE_SIZE really just shouldn't have b= een > >> > > part of the uapi to begin with, and userspace should be able to ha= ndle > >> > > /proc/cmdline of whatever length it turns out to be. I don't see = any > >> > > references to COMMAND_LINE_SIZE anywhere but Linux via a quick Goo= gle > >> > > search, but that's not really enough to consider it unused on my e= nd. > >> > > > >> > > The feedback on the v1 seemed to indicate that COMMAND_LINE_SIZE r= eally > >> > > shouldn't be part of uapi, so this now touches all the ports. I'v= e > >> > > tried to split this all out and leave it bisectable, but I haven't > >> > > tested it all that aggressively. > >> > > >> > Just to confirm this assumption a bit more: that's actually the same > >> > conclusion that we ended up with when commit 3da0243f906a ("s390: ma= ke > >> > command line configurable") went upstream. > > Thanks, I guess I'd missed that one. At some point I think there was > some discussion of making this a Kconfig for everyone, which seems > reasonable to me -- our use case for this being extended is syzkaller, > but we're sort of just picking a value that's big enough for now and > running with it. > > Probably best to get it out of uapi first, though, as that way at least > it's clear that it's not uABI. > > >> Commit 622021cd6c560ce7 ("s390: make command line configurable"), > >> I assume? > > > > Yes, sorry for that. I got distracted while writing and used the wrong > > branch to look this up. > > Alex: Probably worth adding that to the list in the cover letter as it > looks like you were planning on a v4 anyway (which I guess you now have > to do, given that I just added the issue to RISC-V). Yep, I will :) Thanks, Alex 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id BD754C678D4 for ; Thu, 2 Mar 2023 09:00:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=8D1WadvLzocqq7CuYkvIVpeSyFLzIPSEdfOBIKi0TMQ=; b=ZvbSi+jN4S3c+U ghBh69yhAEW2JKVce9NcimflohijjQT2jHQStDXdiVIHqRX3aHe10KRVIS5US87G82cZrxSjES/nx LmB0p78Y02z/Gub1WPvvDbtUFsxnNskB/dxsN5hyfZpwLBu4+cxHTUcJHyzG+ryGgQbAt1j4fCEIG DdW24kwIkmGwDn7A5u4fR0+tfl16dOGiX1UUcvsuwFquIQKCFQ4uA2+LrL4jY4mffjTPn77aTUvQs 8uZnW4Ic09qZoCQdkg0spseTz93T0gyfIHvxK58/7DURgn3CUXEXUbKIl5wqGGgjFMmn8nwO3lxIF w6rR9or+t1DjkuARmFcA==; 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Wed, 01 Mar 2023 23:57:19 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Alexandre Ghiti Date: Thu, 2 Mar 2023 08:57:08 +0100 Message-ID: Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi To: Palmer Dabbelt Cc: hca@linux.ibm.com, geert@linux-m68k.org, corbet@lwn.net, Richard Henderson , ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, Catalin Marinas , Will Deacon , chenhuacai@kernel.org, kernel@xen0n.name, monstr@monstr.eu, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, Paul Walmsley , aou@eecs.berkeley.edu, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, Arnd Bergmann , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230301_235723_656615_310430D2 X-CRM114-Status: GOOD ( 36.14 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Wed, 01 Mar 2023 23:57:19 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Alexandre Ghiti Date: Thu, 2 Mar 2023 08:57:08 +0100 Message-ID: Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi To: Palmer Dabbelt Cc: hca@linux.ibm.com, geert@linux-m68k.org, corbet@lwn.net, Richard Henderson , ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, Catalin Marinas , Will Deacon , chenhuacai@kernel.org, kernel@xen0n.name, monstr@monstr.eu, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, Paul Walmsley , aou@eecs.berkeley.edu, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, Arnd Bergmann , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230301_235723_654035_FC5FC94A X-CRM114-Status: GOOD ( 36.14 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVGh1LCBNYXIgMiwgMjAyMyBhdCA0OjE34oCvQU0gUGFsbWVyIERhYmJlbHQgPHBhbG1lckBk YWJiZWx0LmNvbT4gd3JvdGU6Cj4KPiBPbiBUdWUsIDE0IEZlYiAyMDIzIDAxOjE5OjAyIFBTVCAo LTA4MDApLCBoY2FAbGludXguaWJtLmNvbSB3cm90ZToKPiA+IE9uIFR1ZSwgRmViIDE0LCAyMDIz IGF0IDA5OjU4OjE3QU0gKzAxMDAsIEdlZXJ0IFV5dHRlcmhvZXZlbiB3cm90ZToKPiA+PiBIaSBI ZWlrbywKPiA+Pgo+ID4+IE9uIFR1ZSwgRmViIDE0LCAyMDIzIGF0IDk6MzkgQU0gSGVpa28gQ2Fy c3RlbnMgPGhjYUBsaW51eC5pYm0uY29tPiB3cm90ZToKPiA+PiA+IE9uIFR1ZSwgRmViIDE0LCAy MDIzIGF0IDA4OjQ5OjAxQU0gKzAxMDAsIEFsZXhhbmRyZSBHaGl0aSB3cm90ZToKPiA+PiA+ID4g VGhpcyBhbGwgY2FtZSB1cCBpbiB0aGUgY29udGV4dCBvZiBpbmNyZWFzaW5nIENPTU1BTkRfTElO RV9TSVpFIGluIHRoZQo+ID4+ID4gPiBSSVNDLVYgcG9ydC4gIEluIHRoZW9yeSB0aGF0J3MgYSBV QUJJIGJyZWFrLCBhcyBDT01NQU5EX0xJTkVfU0laRSBpcyB0aGUKPiA+PiA+ID4gbWF4aW11bSBs ZW5ndGggb2YgL3Byb2MvY21kbGluZSBhbmQgdXNlcnNwYWNlIGNvdWxkIHN0YXRpY2x5IHJlbHkg b24KPiA+PiA+ID4gdGhhdCB0byBiZSBjb3JyZWN0Lgo+ID4+ID4gPgo+ID4+ID4gPiBVc3VhbGx5 IEkgd291bGRuJ3QgbWVzcyBhcm91bmQgd2l0aCBjaGFuZ2luZyB0aGlzIHNvcnQgb2YgdGhpbmcs IGJ1dAo+ID4+ID4gPiBQb3dlclBDIGluY3JlYXNlZCBpdCB3aXRoIGE1OTgwZDA2NGZlMiAoInBv d2VycGM6IEJ1bXAgQ09NTUFORF9MSU5FX1NJWkUKPiA+PiA+ID4gdG8gMjA0OCIpLiAgVGhlcmUg YXJlIGFsc28gYSBoYW5kZnVsIG9mIGV4YW1wbGVzIG9mIENPTU1BTkRfTElORV9TSVpFCj4gPj4g PiA+IGluY3JlYXNpbmcsIGJ1dCB0aGV5J3JlIGZyb20gYmVmb3JlIHRoZSBVQVBJIHNwbGl0IHNv IEknbSBub3QgcXVpdGUgc3VyZQo+ID4+ID4gPiB3aGF0IHRoYXQgbWVhbnM6IGU1YTZhMWM5MDk0 OCAoInBvd2VycGM6IGRlcml2ZSBDT01NQU5EX0xJTkVfU0laRSBmcm9tCj4gPj4gPiA+IGFzbS1n ZW5lcmljIiksIDY4NGQyZmQ0OGU3MSAoIltTMzkwXSBrZXJuZWw6IEFwcGVuZCBzY3BkYXRhIHRv IGtlcm5lbAo+ID4+ID4gPiBib290IGNvbW1hbmQgbGluZSIpLCAyMjI0MjY4MWNmZjUgKCJNSVBT OiBFeHRlbmQgQ09NTUFORF9MSU5FX1NJWkUiKSwKPiA+PiA+ID4gYW5kIDJiNzRiODU2OTNjNyAo InNoOiBEZXJpdmUgQ09NTUFORF9MSU5FX1NJWkUgZnJvbQo+ID4+ID4gPiBhc20tZ2VuZXJpYy9z ZXR1cC5oLiIpLgo+ID4+ID4gPgo+ID4+ID4gPiBJdCBzZWVtcyB0byBtZSBsaWtlIENPTU1BTkRf TElORV9TSVpFIHJlYWxseSBqdXN0IHNob3VsZG4ndCBoYXZlIGJlZW4KPiA+PiA+ID4gcGFydCBv ZiB0aGUgdWFwaSB0byBiZWdpbiB3aXRoLCBhbmQgdXNlcnNwYWNlIHNob3VsZCBiZSBhYmxlIHRv IGhhbmRsZQo+ID4+ID4gPiAvcHJvYy9jbWRsaW5lIG9mIHdoYXRldmVyIGxlbmd0aCBpdCB0dXJu cyBvdXQgdG8gYmUuICBJIGRvbid0IHNlZSBhbnkKPiA+PiA+ID4gcmVmZXJlbmNlcyB0byBDT01N QU5EX0xJTkVfU0laRSBhbnl3aGVyZSBidXQgTGludXggdmlhIGEgcXVpY2sgR29vZ2xlCj4gPj4g PiA+IHNlYXJjaCwgYnV0IHRoYXQncyBub3QgcmVhbGx5IGVub3VnaCB0byBjb25zaWRlciBpdCB1 bnVzZWQgb24gbXkgZW5kLgo+ID4+ID4gPgo+ID4+ID4gPiBUaGUgZmVlZGJhY2sgb24gdGhlIHYx IHNlZW1lZCB0byBpbmRpY2F0ZSB0aGF0IENPTU1BTkRfTElORV9TSVpFIHJlYWxseQo+ID4+ID4g PiBzaG91bGRuJ3QgYmUgcGFydCBvZiB1YXBpLCBzbyB0aGlzIG5vdyB0b3VjaGVzIGFsbCB0aGUg cG9ydHMuICBJJ3ZlCj4gPj4gPiA+IHRyaWVkIHRvIHNwbGl0IHRoaXMgYWxsIG91dCBhbmQgbGVh dmUgaXQgYmlzZWN0YWJsZSwgYnV0IEkgaGF2ZW4ndAo+ID4+ID4gPiB0ZXN0ZWQgaXQgYWxsIHRo YXQgYWdncmVzc2l2ZWx5Lgo+ID4+ID4KPiA+PiA+IEp1c3QgdG8gY29uZmlybSB0aGlzIGFzc3Vt cHRpb24gYSBiaXQgbW9yZTogdGhhdCdzIGFjdHVhbGx5IHRoZSBzYW1lCj4gPj4gPiBjb25jbHVz aW9uIHRoYXQgd2UgZW5kZWQgdXAgd2l0aCB3aGVuIGNvbW1pdCAzZGEwMjQzZjkwNmEgKCJzMzkw OiBtYWtlCj4gPj4gPiBjb21tYW5kIGxpbmUgY29uZmlndXJhYmxlIikgd2VudCB1cHN0cmVhbS4K Pgo+IFRoYW5rcywgSSBndWVzcyBJJ2QgbWlzc2VkIHRoYXQgb25lLiAgQXQgc29tZSBwb2ludCBJ IHRoaW5rIHRoZXJlIHdhcwo+IHNvbWUgZGlzY3Vzc2lvbiBvZiBtYWtpbmcgdGhpcyBhIEtjb25m aWcgZm9yIGV2ZXJ5b25lLCB3aGljaCBzZWVtcwo+IHJlYXNvbmFibGUgdG8gbWUgLS0gb3VyIHVz ZSBjYXNlIGZvciB0aGlzIGJlaW5nIGV4dGVuZGVkIGlzIHN5emthbGxlciwKPiBidXQgd2UncmUg c29ydCBvZiBqdXN0IHBpY2tpbmcgYSB2YWx1ZSB0aGF0J3MgYmlnIGVub3VnaCBmb3Igbm93IGFu ZAo+IHJ1bm5pbmcgd2l0aCBpdC4KPgo+IFByb2JhYmx5IGJlc3QgdG8gZ2V0IGl0IG91dCBvZiB1 YXBpIGZpcnN0LCB0aG91Z2gsIGFzIHRoYXQgd2F5IGF0IGxlYXN0Cj4gaXQncyBjbGVhciB0aGF0 IGl0J3Mgbm90IHVBQkkuCj4KPiA+PiBDb21taXQgNjIyMDIxY2Q2YzU2MGNlNyAoInMzOTA6IG1h a2UgY29tbWFuZCBsaW5lIGNvbmZpZ3VyYWJsZSIpLAo+ID4+IEkgYXNzdW1lPwo+ID4KPiA+IFll cywgc29ycnkgZm9yIHRoYXQuIEkgZ290IGRpc3RyYWN0ZWQgd2hpbGUgd3JpdGluZyBhbmQgdXNl ZCB0aGUgd3JvbmcKPiA+IGJyYW5jaCB0byBsb29rIHRoaXMgdXAuCj4KPiBBbGV4OiBQcm9iYWJs eSB3b3J0aCBhZGRpbmcgdGhhdCB0byB0aGUgbGlzdCBpbiB0aGUgY292ZXIgbGV0dGVyIGFzIGl0 Cj4gbG9va3MgbGlrZSB5b3Ugd2VyZSBwbGFubmluZyBvbiBhIHY0IGFueXdheSAod2hpY2ggSSBn dWVzcyB5b3Ugbm93IGhhdmUKPiB0byBkbywgZ2l2ZW4gdGhhdCBJIGp1c3QgYWRkZWQgdGhlIGlz c3VlIHRvIFJJU0MtVikuCgpZZXAsIEkgd2lsbCA6KQoKVGhhbmtzLAoKQWxleAoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGlu ZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJh ZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo= 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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27344C678D4 for ; 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bh=3gGlmdrxpk12L0HtiU5R9bJeUayhxQ74GXgfAq6meuw=; b=iiZByP2roH7UmBQ8MZ6LBmWMlOtXeKqTCn8P99Zp0tvQaNAZXHA/Oh2AepFYFPowii jpnQZL9feZP0jISWv4Wo1xjY1UgL0FwuEDtfDyjAr8x2tAuSwgU5Q2zjtNLXn13tsV1q VdmKUi3+ebJ/WFu24if4PT12SmB8CxzMa4rk93VBdLLEDPsESvZZn2OJLmNEgmqGCZbp su4lxSSG5QWCFkkUvJaPKt2uRpLDPmkhtnBmi6MNktHY0vVUd+iz4/m3RnOm6ERgwcCA eOo3qUjw4HmjEVfSpLvviuO2rRzSjCa8/tOxAL278Rc40yMWxyQRfUyHErkz0XTr297b vEKg== X-Gm-Message-State: AO0yUKVh5TeXiH0RYbLhuYDEPtK8EzNsWkLWLDFdLXT+ZiQMj8ssDRTy BR11LmIUDTQ8cyNS8qcYK/sDdawdPbGwRuHGVHJJ/w== X-Google-Smtp-Source: AK7set8WtHYe+gEo1Fgs1pSlJqsnM2tCvgsXzdB6/J3n+P8FnRw3jetc5Yrjj9TAlqQSjPmyeFZCYlu44lotg0az/Sk= X-Received: by 2002:a05:600c:4591:b0:3ea:8ed9:8e4b with SMTP id r17-20020a05600c459100b003ea8ed98e4bmr2655128wmo.6.1677743839531; Wed, 01 Mar 2023 23:57:19 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Alexandre Ghiti Date: Thu, 2 Mar 2023 08:57:08 +0100 Message-ID: Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi To: Palmer Dabbelt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dalias@libc.org, linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org, Catalin Marinas , dave.hansen@linux.intel.com, x86@kernel.org, linux-mips@vger.kernel.org, James.Bottomley@hansenpartnership.com, jcmvbkbc@gmail.com, hpa@zytor.com, sparclinux@vger.kernel.org, kernel@xen0n.name, Will Deacon , agordeev@linux.ibm.com, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, linux-snps-arc@lists.infradead.org, Arnd Bergmann , ysato@users.sourceforge.jp, corbet@lwn.net, linux-sh@vger.kernel.org, deller@gmx.de, chenhuacai@kernel.org, linux@armlinux.org.uk, mingo@redhat.com, geert@linux-m68k.org, vgupta@kernel.org, mattst88@gmail.com, borntraeger@linux.ibm.com, linux-xtensa@linux-xtensa.org, aou@eecs.berkeley.edu, gor@linux.ibm.com, hca@linux.ibm.com, Richard Henderson , npiggin@gmail.com, linux-m68k@lists.linux-m68k.org, ink@jurassic.park.msu.ru, loongarch@lists.linux.dev, Paul Walmsley , tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, chris@zankel.net, monstr@monstr.eu, tsbogend@alpha.franken.de, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, svens@linux.ibm.com, linux-alpha@vger.kernel.org, bp@alien8.de, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Mar 2, 2023 at 4:17=E2=80=AFAM Palmer Dabbelt = wrote: > > On Tue, 14 Feb 2023 01:19:02 PST (-0800), hca@linux.ibm.com wrote: > > On Tue, Feb 14, 2023 at 09:58:17AM +0100, Geert Uytterhoeven wrote: > >> Hi Heiko, > >> > >> On Tue, Feb 14, 2023 at 9:39 AM Heiko Carstens wro= te: > >> > On Tue, Feb 14, 2023 at 08:49:01AM +0100, Alexandre Ghiti wrote: > >> > > This all came up in the context of increasing COMMAND_LINE_SIZE in= the > >> > > RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE = is the > >> > > maximum length of /proc/cmdline and userspace could staticly rely = on > >> > > that to be correct. > >> > > > >> > > Usually I wouldn't mess around with changing this sort of thing, b= ut > >> > > PowerPC increased it with a5980d064fe2 ("powerpc: Bump COMMAND_LIN= E_SIZE > >> > > to 2048"). There are also a handful of examples of COMMAND_LINE_S= IZE > >> > > increasing, but they're from before the UAPI split so I'm not quit= e sure > >> > > what that means: e5a6a1c90948 ("powerpc: derive COMMAND_LINE_SIZE = from > >> > > asm-generic"), 684d2fd48e71 ("[S390] kernel: Append scpdata to ker= nel > >> > > boot command line"), 22242681cff5 ("MIPS: Extend COMMAND_LINE_SIZE= "), > >> > > and 2b74b85693c7 ("sh: Derive COMMAND_LINE_SIZE from > >> > > asm-generic/setup.h."). > >> > > > >> > > It seems to me like COMMAND_LINE_SIZE really just shouldn't have b= een > >> > > part of the uapi to begin with, and userspace should be able to ha= ndle > >> > > /proc/cmdline of whatever length it turns out to be. I don't see = any > >> > > references to COMMAND_LINE_SIZE anywhere but Linux via a quick Goo= gle > >> > > search, but that's not really enough to consider it unused on my e= nd. > >> > > > >> > > The feedback on the v1 seemed to indicate that COMMAND_LINE_SIZE r= eally > >> > > shouldn't be part of uapi, so this now touches all the ports. I'v= e > >> > > tried to split this all out and leave it bisectable, but I haven't > >> > > tested it all that aggressively. > >> > > >> > Just to confirm this assumption a bit more: that's actually the same > >> > conclusion that we ended up with when commit 3da0243f906a ("s390: ma= ke > >> > command line configurable") went upstream. > > Thanks, I guess I'd missed that one. At some point I think there was > some discussion of making this a Kconfig for everyone, which seems > reasonable to me -- our use case for this being extended is syzkaller, > but we're sort of just picking a value that's big enough for now and > running with it. > > Probably best to get it out of uapi first, though, as that way at least > it's clear that it's not uABI. > > >> Commit 622021cd6c560ce7 ("s390: make command line configurable"), > >> I assume? > > > > Yes, sorry for that. I got distracted while writing and used the wrong > > branch to look this up. > > Alex: Probably worth adding that to the list in the cover letter as it > looks like you were planning on a v4 anyway (which I guess you now have > to do, given that I just added the issue to RISC-V). Yep, I will :) Thanks, Alex From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Ghiti Date: Thu, 02 Mar 2023 07:57:08 +0000 Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable To: Palmer Dabbelt Cc: hca@linux.ibm.com, geert@linux-m68k.org, corbet@lwn.net, Richard Henderson , ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, Catalin Marinas , Will Deacon , chenhuacai@kernel.org, kernel@xen0n.name, monstr@monstr.eu, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, Paul Walmsley , aou@eecs.berkeley.edu, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, Arnd Bergmann , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org On Thu, Mar 2, 2023 at 4:17=E2=80=AFAM Palmer Dabbelt = wrote: > > On Tue, 14 Feb 2023 01:19:02 PST (-0800), hca@linux.ibm.com wrote: > > On Tue, Feb 14, 2023 at 09:58:17AM +0100, Geert Uytterhoeven wrote: > >> Hi Heiko, > >> > >> On Tue, Feb 14, 2023 at 9:39 AM Heiko Carstens wro= te: > >> > On Tue, Feb 14, 2023 at 08:49:01AM +0100, Alexandre Ghiti wrote: > >> > > This all came up in the context of increasing COMMAND_LINE_SIZE in= the > >> > > RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE = is the > >> > > maximum length of /proc/cmdline and userspace could staticly rely = on > >> > > that to be correct. > >> > > > >> > > Usually I wouldn't mess around with changing this sort of thing, b= ut > >> > > PowerPC increased it with a5980d064fe2 ("powerpc: Bump COMMAND_LIN= E_SIZE > >> > > to 2048"). There are also a handful of examples of COMMAND_LINE_S= IZE > >> > > increasing, but they're from before the UAPI split so I'm not quit= e sure > >> > > what that means: e5a6a1c90948 ("powerpc: derive COMMAND_LINE_SIZE = from > >> > > asm-generic"), 684d2fd48e71 ("[S390] kernel: Append scpdata to ker= nel > >> > > boot command line"), 22242681cff5 ("MIPS: Extend COMMAND_LINE_SIZE= "), > >> > > and 2b74b85693c7 ("sh: Derive COMMAND_LINE_SIZE from > >> > > asm-generic/setup.h."). > >> > > > >> > > It seems to me like COMMAND_LINE_SIZE really just shouldn't have b= een > >> > > part of the uapi to begin with, and userspace should be able to ha= ndle > >> > > /proc/cmdline of whatever length it turns out to be. I don't see = any > >> > > references to COMMAND_LINE_SIZE anywhere but Linux via a quick Goo= gle > >> > > search, but that's not really enough to consider it unused on my e= nd. > >> > > > >> > > The feedback on the v1 seemed to indicate that COMMAND_LINE_SIZE r= eally > >> > > shouldn't be part of uapi, so this now touches all the ports. I've > >> > > tried to split this all out and leave it bisectable, but I haven't > >> > > tested it all that aggressively. > >> > > >> > Just to confirm this assumption a bit more: that's actually the same > >> > conclusion that we ended up with when commit 3da0243f906a ("s390: ma= ke > >> > command line configurable") went upstream. > > Thanks, I guess I'd missed that one. At some point I think there was > some discussion of making this a Kconfig for everyone, which seems > reasonable to me -- our use case for this being extended is syzkaller, > but we're sort of just picking a value that's big enough for now and > running with it. > > Probably best to get it out of uapi first, though, as that way at least > it's clear that it's not uABI. > > >> Commit 622021cd6c560ce7 ("s390: make command line configurable"), > >> I assume? > > > > Yes, sorry for that. I got distracted while writing and used the wrong > > branch to look this up. > > Alex: Probably worth adding that to the list in the cover letter as it > looks like you were planning on a v4 anyway (which I guess you now have > to do, given that I just added the issue to RISC-V). Yep, I will :) Thanks, Alex From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Ghiti Subject: Re: [PATCH v3 00/24] Remove COMMAND_LINE_SIZE from uapi Date: Thu, 2 Mar 2023 08:57:08 +0100 Message-ID: References: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; t=1677743839; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=3gGlmdrxpk12L0HtiU5R9bJeUayhxQ74GXgfAq6meuw=; b=pn+DJn+k9uImMGeBMXuwnMQE1biMNzy71Plo8H7DOI3fKK/ceps9rgGUxc/bmw8s6L 4TQMSud9TXFc8/r2OEOEiAKv5SApxcJ1Yd/LQHA0imhiw3qi8hrsJYLIdS7LaNAmBH1O AbgLlGVWFn2hf8BkmR90At5+g3zqQ61Ankq9cGuBB9WgQfAsyn4JZulcRbW71gf7ZeYz oRP4F6/LxUTL9nxCbjnWUdwQSV0fTcnbx/sIcDMk8fB8xQ9dJ6UAQMnDD3HBbCn+Qr4a fIykdIwuX5WmEnYpwkBvfu6oXc7MDCcdwlfNYOa5JGNIdVdo8Hubuxh+Kfco99U7Z89i QfaQ== In-Reply-To: List-ID: Content-Type: text/plain; charset="windows-1252" To: Palmer Dabbelt Cc: hca@linux.ibm.com, geert@linux-m68k.org, corbet@lwn.net, Richard Henderson , ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, Catalin Marinas , Will Deacon , chenhuacai@kernel.org, kernel@xen0n.name, monstr@monstr.eu, tsbogend@alpha.franken.de, James.Bottomley@hansenpartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, Paul Walmsley , aou@eecs.berkeley.edu, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel. On Thu, Mar 2, 2023 at 4:17=E2=80=AFAM Palmer Dabbelt = wrote: > > On Tue, 14 Feb 2023 01:19:02 PST (-0800), hca@linux.ibm.com wrote: > > On Tue, Feb 14, 2023 at 09:58:17AM +0100, Geert Uytterhoeven wrote: > >> Hi Heiko, > >> > >> On Tue, Feb 14, 2023 at 9:39 AM Heiko Carstens wro= te: > >> > On Tue, Feb 14, 2023 at 08:49:01AM +0100, Alexandre Ghiti wrote: > >> > > This all came up in the context of increasing COMMAND_LINE_SIZE in= the > >> > > RISC-V port. In theory that's a UABI break, as COMMAND_LINE_SIZE = is the > >> > > maximum length of /proc/cmdline and userspace could staticly rely = on > >> > > that to be correct. > >> > > > >> > > Usually I wouldn't mess around with changing this sort of thing, b= ut > >> > > PowerPC increased it with a5980d064fe2 ("powerpc: Bump COMMAND_LIN= E_SIZE > >> > > to 2048"). There are also a handful of examples of COMMAND_LINE_S= IZE > >> > > increasing, but they're from before the UAPI split so I'm not quit= e sure > >> > > what that means: e5a6a1c90948 ("powerpc: derive COMMAND_LINE_SIZE = from > >> > > asm-generic"), 684d2fd48e71 ("[S390] kernel: Append scpdata to ker= nel > >> > > boot command line"), 22242681cff5 ("MIPS: Extend COMMAND_LINE_SIZE= "), > >> > > and 2b74b85693c7 ("sh: Derive COMMAND_LINE_SIZE from > >> > > asm-generic/setup.h."). > >> > > > >> > > It seems to me like COMMAND_LINE_SIZE really just shouldn't have b= een > >> > > part of the uapi to begin with, and userspace should be able to ha= ndle > >> > > /proc/cmdline of whatever length it turns out to be. I don't see = any > >> > > references to COMMAND_LINE_SIZE anywhere but Linux via a quick Goo= gle > >> > > search, but that's not really enough to consider it unused on my e= nd. > >> > > > >> > > The feedback on the v1 seemed to indicate that COMMAND_LINE_SIZE r= eally > >> > > shouldn't be part of uapi, so this now touches all the ports. I'v= e > >> > > tried to split this all out and leave it bisectable, but I haven't > >> > > tested it all that aggressively. > >> > > >> > Just to confirm this assumption a bit more: that's actually the same > >> > conclusion that we ended up with when commit 3da0243f906a ("s390: ma= ke > >> > command line configurable") went upstream. > > Thanks, I guess I'd missed that one. At some point I think there was > some discussion of making this a Kconfig for everyone, which seems > reasonable to me -- our use case for this being extended is syzkaller, > but we're sort of just picking a value that's big enough for now and > running with it. > > Probably best to get it out of uapi first, though, as that way at least > it's clear that it's not uABI. > > >> Commit 622021cd6c560ce7 ("s390: make command line configurable"), > >> I assume? > > > > Yes, sorry for that. I got distracted while writing and used the wrong > > branch to look this up. > > Alex: Probably worth adding that to the list in the cover letter as it > looks like you were planning on a v4 anyway (which I guess you now have > to do, given that I just added the issue to RISC-V). Yep, I will :) Thanks, Alex