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Tue, 30 Dec 2025 16:19:43 -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: AGeayQqQY9QV Date: Tue, 30 Dec 2025 22:19:22 +0100 From: "Arnd Bergmann" To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , "Vineet Gupta" , "Russell King" , "Dinh Nguyen" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" Cc: linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Message-Id: <93c55086-931a-4282-a94c-de4954047fa9@app.fastmail.com> In-Reply-To: <20251230-headers_install-config-leak-v1-3-efba5c58073d@linutronix.de> References: <20251230-headers_install-config-leak-v1-0-efba5c58073d@linutronix.de> <20251230-headers_install-config-leak-v1-3-efba5c58073d@linutronix.de> Subject: Re: [PATCH 3/5] nios2: uapi: Stop leaking CONFIG_NIOS2_CI_SWAB_{NO,SUPPORT} references to userspace Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, Dec 30, 2025, at 08:10, Thomas Wei=C3=9Fschuh wrote: > UAPI headers are not supposed to leak references to kconfig symbols. > These won't be set when building userspace. Hide the kconfig reference > behind 'ifdef __KERNEL__', so it will be stripped by > headers_install.sh. The result for userspace will be the same, but the > exceptions in headers_install.sh can also be removed. > > Signed-off-by: Thomas Wei=C3=9Fschuh Acked-by: Arnd Bergmann > --- > arch/nios2/include/uapi/asm/swab.h | 2 ++ > scripts/headers_install.sh | 2 -- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/nios2/include/uapi/asm/swab.h=20 > b/arch/nios2/include/uapi/asm/swab.h > index 9750547a5f82..bbfa9bd10b2f 100644 > --- a/arch/nios2/include/uapi/asm/swab.h > +++ b/arch/nios2/include/uapi/asm/swab.h > @@ -14,6 +14,7 @@ > #include > #include >=20 > +#ifdef __KERNEL__ > #ifdef CONFIG_NIOS2_CI_SWAB_SUPPORT > #ifdef __GNUC__ >=20 I'm fairly sure this approach is correct, but I noticed that this makes arch/nios2/include/uapi/asm/swab.h empty in userspace, so you could just move the current file to arch/nios2/include/asm/swab.h instead and fall back to the asm-generic header for uapi. Arnd