linux-kernel - Re: [PATCH 3/5] nios2: uapi: Stop leaking CONFIG_NIOS2_CI_SWAB

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Message-Id: <93c55086-931a-4282-a94c-de4954047fa9@app.fastmail.com>
Date: Tue, 30 Dec 2025 22:19:22 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 "Vineet Gupta" <vgupta@...nel.org>, "Russell King" <linux@...linux.org.uk>,
 "Dinh Nguyen" <dinguyen@...nel.org>, "Thomas Gleixner" <tglx@...utronix.de>,
 "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
 "Dave Hansen" <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>
Cc: linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/5] nios2: uapi: Stop leaking CONFIG_NIOS2_CI_SWAB_{NO,SUPPORT}
 references to userspace

On Tue, Dec 30, 2025, at 08:10, Thomas Weißschuh 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 Weißschuh <thomas.weissschuh@...utronix.de>

Acked-by: Arnd Bergmann <arnd@...db.de>

> ---
>  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 
> 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 <linux/types.h>
>  #include <asm-generic/swab.h>
> 
> +#ifdef __KERNEL__
>  #ifdef CONFIG_NIOS2_CI_SWAB_SUPPORT
>  #ifdef __GNUC__
> 

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