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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1695130683; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TSvl1bE0F1t0l9cKjEZTuHIuAQOE9Vzum9apTSS89S0=; b=AIuWwYSi2NsqJq5ZndU1p5lzthklJfesQGq1AlvXjJTf/BxkhhWB+TWJ1Um5jEfF+zsH5L XsRjyu3DiWU++BbUDlE2LWEWwxQQ1j1geFF8+ua8ZTRNVOPCZiKMuWCwbHFJQubONxBA0I JJJm+czCIg5VQC2UlClupEKAQuXhkaY= Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost.zedat.fu-berlin.de (Exim 4.95) with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1qiaus-000uPZ-85; Tue, 19 Sep 2023 15:37:26 +0200 Received: from p5b13a40a.dip0.t-ipconnect.de ([91.19.164.10] helo=suse-laptop.fritz.box) by inpost2.zedat.fu-berlin.de (Exim 4.95) with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1qiaur-001w4I-UQ; Tue, 19 Sep 2023 15:37:26 +0200 Message-ID: <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> Subject: Re: Arches that don't support PREEMPT From: John Paul Adrian Glaubitz To: Matthew Wilcox , Thomas Gleixner Cc: Linus Torvalds , Peter Zijlstra , Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org Date: Tue, 19 Sep 2023 15:37:24 +0200 In-Reply-To: References: <87edj64rj1.fsf@oracle.com> <87zg1u1h5t.fsf@oracle.com> <20230911150410.GC9098@noisy.programming.kicks-ass.net> <87h6o01w1a.fsf@oracle.com> <20230912082606.GB35261@noisy.programming.kicks-ass.net> <87cyyfxd4k.ffs@tglx> <87led2wdj0.ffs@tglx> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.4 MIME-Version: 1.0 X-Original-Sender: glaubitz@physik.fu-berlin.de X-Originating-IP: 91.19.164.10 X-ZEDAT-Hint: PO X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C5CC51C0012 X-Stat-Signature: oxhxir3wpxoh9xbwig847aepkit77n34 X-Rspam-User: X-HE-Tag: 1695130682-191395 X-HE-Meta: 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 +eMcP7IR Fc9syGETVfMFCwpFP8B9s6w6SdLYpnNR3844tX2GmADZ1HmfNEtEQes6h3YVWwFkrq7JYj8PeFc556Z+mP0pxh0nXJ/LX6AamYMfeBRvExfThODVItxv283Ctf9WVm8AlSxfqt2RkxNTd91lu10ZPpCvsfJ+54iOLxXcP+6CsWd5ygk76bzUiIyZJo1vGIGWTnAJ6msNoVG/hjs9eC3hZmxiinJtzbmavDmp3LC2btM0vRYNZ605+z13B8MxZ1JQGy+Rq94LajZVCBO04CfZrPHXO6/uftggaZLZE274dMcXTKDsQn/p25+/zZHQZ2LfKvHUy+E8wT9qiJTE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote: > On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote: > > Though it just occured to me that there are dragons lurking: > >=20 > > arch/alpha/Kconfig: select ARCH_NO_PREEMPT > > arch/hexagon/Kconfig: select ARCH_NO_PREEMPT > > arch/m68k/Kconfig: select ARCH_NO_PREEMPT if !COLDFIRE > > arch/um/Kconfig: select ARCH_NO_PREEMPT >=20 > Sounds like three-and-a-half architectures which could be queued up for > removal right behind ia64 ... The agreement to kill off ia64 wasn't an invitation to kill off other stuff that people are still working on! Can we please not do this? Thanks, Adrian --=20 .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913