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Mon, 19 Jan 2026 07:45:25 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: A42RL7jkrr-J Date: Mon, 19 Jan 2026 13:45:04 +0100 From: "Arnd Bergmann" To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , "David Laight" Cc: "David S . Miller" , "Andreas Larsson" , "Andy Lutomirski" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" , "Sven Schnelle" , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, Linux-Arch , linux-s390@vger.kernel.org Message-Id: <72a2744a-debc-4d8f-b418-5d6a595c2578@app.fastmail.com> In-Reply-To: <20260119114526-a15e7172-fc4c-40d0-a651-7c4a21acb1c8@linutronix.de> References: <20260116-vdso-compat-checkflags-v1-0-4a83b4fbb0d3@linutronix.de> <20260116-vdso-compat-checkflags-v1-4-4a83b4fbb0d3@linutronix.de> <20260119100619.479bcff3@pumpkin> <20260119111037-4decf57f-2094-4fac-bcf4-03506791b197@linutronix.de> <20260119103758.3afb5927@pumpkin> <20260119114526-a15e7172-fc4c-40d0-a651-7c4a21acb1c8@linutronix.de> Subject: Re: [PATCH 4/4] asm-generic/bitsperlong.h: Add sanity checks for __BITS_PER_LONG Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Mon, Jan 19, 2026, at 11:56, Thomas Wei=C3=9Fschuh wrote: > On Mon, Jan 19, 2026 at 10:37:58AM +0000, David Laight wrote: >>=20 >> Don't you need a check that it isn't wrong on a user system? >> Which is what I thought it was doing. > > Not really. The overrides defined by arch/*/include/uapi/asm/bitsperlo= ng.h are > being tested here. If they work in the kernel build I assume they also= work > in userspace. I think You could just move check into include/asm-generic/bitsperlong.h to make this more obvious with the #ifdef __KERNEL__, and remove the disabled check from my original version there. Arnd