linux-kernel - [PATCH v2 3/5] nios2: uapi: Remove custom asm/swab.h from UAPI

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Message-Id: <20260112-headers_install-config-leak-v2-3-4d8084444603@linutronix.de>
Date: Mon, 12 Jan 2026 08:58:31 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: 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, Arnd Bergmann <arnd@...db.de>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 3/5] nios2: uapi: Remove custom asm/swab.h from UAPI

UAPI headers are not supposed to leak references to kconfig symbols.
They are undefined there in any case. As all actual definitions of this
header are guarded behind a kconfig symbol, for userspace the header is
always identical to its asm-generic variant.

Make the custom UAPI header a kernel-internal one, so the leaks of
kconfig symbols are fixed and userspace will instead use
asm-generic/swab.h directly.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/lkml/93c55086-931a-4282-a94c-de4954047fa9@app.fastmail.com/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/nios2/include/{uapi => }/asm/swab.h | 0
 scripts/headers_install.sh               | 2 --
 2 files changed, 2 deletions(-)

diff --git a/arch/nios2/include/uapi/asm/swab.h b/arch/nios2/include/asm/swab.h
similarity index 100%
rename from arch/nios2/include/uapi/asm/swab.h
rename to arch/nios2/include/asm/swab.h
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 4f03521f4026..613f400a67d1 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -70,8 +70,6 @@ configs=$(sed -e '
 #
 # The format is <file-name>:<CONFIG-option> in each line.
 config_leak_ignores="
-arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
-arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
 arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
 arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
 "

-- 
2.52.0