Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Arnd Bergmann <arnd@kernel.org>, linux-fbdev@vger.kernel.org,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Helge Deller <deller@gmx.de>,
        Javier Martinez Canillas <javierm@redhat.com>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        "David S. Miller" <davem@davemloft.net>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Ard Biesheuvel <ardb@kernel.org>,
        Borislav Petkov <bp@alien8.de>, Brian Cain <bcain@quicinc.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Daniel Vetter <daniel@ffwll.ch>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Airlie <airlied@gmail.com>,
        Deepak Rawat <drawat.floss@gmail.com>,
        Dexuan Cui <decui@microsoft.com>,
        Dinh Nguyen <dinguyen@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Guo Ren <guoren@kernel.org>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        Khalid Aziz <khalid@gonehiking.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Matt Turner <mattst88@gmail.com>,
        Max Filippov <jcmvbkbc@gmail.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Russell King <linux@armlinux.org.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        WANG Xuerui <kernel@xen0n.name>, Wei Liu <wei.liu@kernel.org>,
        Will Deacon <will@kernel.org>, x86@kernel.org,
        linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org,
        linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org,
        linux-ia64@vger.kernel.org, loongarch@lists.linux.dev,
        linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,
        sparclinux@vger.kernel.org, linux-hyperv@vger.kernel.org,
        dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 1/9] vgacon: rework Kconfig dependencies
In-Reply-To: <20230719123944.3438363-2-arnd@kernel.org>
References: <20230719123944.3438363-1-arnd@kernel.org>
 <20230719123944.3438363-2-arnd@kernel.org>
Date:   Fri, 21 Jul 2023 14:59:24 +1000
Message-ID: <87pm4lj1w3.fsf@mail.lhotse>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Arnd Bergmann <arnd@kernel.org> writes:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The list of dependencies here is phrased as an opt-out, but this is missing
> a lot of architectures that don't actually support VGA consoles, and some
> of the entries are stale:
>
>  - powerpc used to support VGA consoles in the old arch/ppc codebase, but
>    the merged arch/powerpc never did

Not disputing this, but how did you come to that conclusion? I grepped
around and couldn't convince myself whether it can work on powerpc or
not. ie. currently it's possible to enable CONFIG_VGA_CONSOLE and
powerpc does have a struct screen_info defined which seems like it would
allow vgacon_startup() to complete.

My only concern is that someone could be using it with Qemu?

cheers