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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49045620c05sm66878075e9.14.2026.05.22.14.22.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2026 14:22:02 -0700 (PDT) Date: Fri, 22 May 2026 22:22:00 +0100 From: David Laight To: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Cc: Arnd Bergmann , Arnd Bergmann , Ingo Molnar , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra , Will Deacon , Boqun Feng , Gary Guo , Yury Norov , Rasmus Villemoes , Boris Ostrovsky , Alexander Usyskin , Anthony L Nguyen , Przemek Kitszel , x86@kernel.org, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org Subject: Re: [PATCH 5/8] x86: remove dependencies on CONFIG_M... CPU options Message-ID: <20260522222200.50bcdfdd@pumpkin> In-Reply-To: References: <20260522141959.1071595-1-arnd@kernel.org> <20260522141959.1071595-6-arnd@kernel.org> <57e5a8e2-d277-459b-a10f-48c5f1b5f0cf@suse.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Fri, 22 May 2026 21:00:00 +0200 J=C3=BCrgen Gro=C3=9F wrote: > On 22.05.26 20:54, Arnd Bergmann wrote: > > On Fri, May 22, 2026, at 17:46, Juergen Gross wrote: =20 > >> On 22.05.26 16:19, Arnd Bergmann wrote: =20 > >>> > >>> --- a/arch/x86/xen/Kconfig > >>> +++ b/arch/x86/xen/Kconfig > >>> @@ -10,8 +10,7 @@ config XEN > >>> select X86_HV_CALLBACK_VECTOR > >>> select HIBERNATE_CALLBACKS > >>> depends on X86_64 || (X86_32 && X86_PAE) > >>> - depends on X86_64 || (X86_GENERIC || MPENTIUM4 || MATOM) > >>> - depends on X86_LOCAL_APIC && X86_TSC > >>> + depends on X86_LOCAL_APIC =20 > >> > >> This is problematic. See commit 93cd05976498. > >> > >> Maybe use "depends on X86_LOCAL_APIC && X86_L1_CACHE_SHIFT >=3D 6" ins= tead? =20 > >=20 > > After patch 6/8, this is always true, so I suppose it would > > if that came first, right? =20 >=20 > Yes, agreed. >=20 > >=20 > > On a related note, are there still remaining Xen users on new > > 32-bit guest kernels? I understand that one could still run > > modern kernels on 32-bit Xen-4.2 (EOL in 2015), and that 64-bit > > Xen still supports older 32-bit guest operating systems for > > compatibility, but I'm not sure if there is any reason to > > legitimately run a 32-bit linux-7.x kernel on a 64-bit Xen > > instead of running a better supported 64-bit guest kernel. =20 >=20 > From the logical point of view I totally agree. OTOH users are humans, > so they might not agree with that. ;-) You might just want to test a 32bit kernel ? -- David >=20 >=20 > Juergen