[PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[Thomas Weißschuh]

A few UAPI headers still contained references to kconfig symbols.
Clean them all up and afterwards remove the now useless exception
machinery in headers_install.sh.

Intended to be routed through the kbuild tree.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Changes in v2:
- Drop ARC_HAS_SWAPE kconfig option, use ARCH_USE_BUILTIN_BSWAP
- Drop PSR_ENDSTATE from the ARM ptrace.h header.
- Drop nios2 uapi asm/swab.h.
- Link to v1: https://lore.kernel.org/r/20251230-headers_install-config-leak-v1-0-efba5c58073d@linutronix.de

---
Thomas Weißschuh (5):
      ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP
      ARM: uapi: Drop PSR_ENDSTATE
      nios2: uapi: Remove custom asm/swab.h from UAPI
      x86/uapi: Stop leaking kconfig references to userspace
      scripts: headers_install.sh: Remove config leak ignore machinery

 arch/arc/Kconfig                         |  6 +-
 arch/arc/Makefile                        |  3 +-
 arch/arc/include/uapi/asm/swab.h         | 99 --------------------------------
 arch/arm/include/asm/processor.h         |  3 +-
 arch/arm/include/uapi/asm/ptrace.h       |  9 ---
 arch/arm/kernel/signal.c                 |  3 +-
 arch/nios2/include/{uapi => }/asm/swab.h |  0
 arch/x86/include/uapi/asm/auxvec.h       |  2 +-
 scripts/headers_install.sh               | 30 +---------
 9 files changed, 9 insertions(+), 146 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251229-headers_install-config-leak-b8a9219d8b3c

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@linutronix.de>

[PATCH v2 1/5] ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP

[Thomas Weißschuh]

Since commit 67a697e7576 ("ARC: retire ARC750 support") all supported
CPUs have the 'swape' instruction.

Replace the custom logic with ARCH_USE_BUILTIN_BSWAP which makes
use of 'swape'.

As as side-effect, remove a leak of an internal kconfig symbol through
the UAPI headers.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/lkml/0ae2688a-5a22-405b-adaf-9b5ad712b245@app.fastmail.com/
Suggested-by: Vineet Gupta <vgupta@kernel.org>
Link: https://lore.kernel.org/lkml/a033a402-e3c5-4982-9fff-b6a4c55817ae@kernel.org/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/arc/Kconfig                 |  6 +--
 arch/arc/Makefile                |  3 +-
 arch/arc/include/uapi/asm/swab.h | 99 ----------------------------------------
 scripts/headers_install.sh       |  1 -
 4 files changed, 2 insertions(+), 107 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index f27e6b90428e..390a14360689 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -16,6 +16,7 @@ config ARC
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select ARCH_NEED_CMPXCHG_1_EMU
 	select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
+	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_32BIT_OFF_T
 	select BUILDTIME_TABLE_SORT
 	select GENERIC_BUILTIN_DTB
@@ -121,7 +122,6 @@ choice
 config ARC_CPU_770
 	bool "ARC770"
 	depends on ISA_ARCOMPACT
-	select ARC_HAS_SWAPE
 	help
 	  Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 	  This core has a bunch of cool new features:
@@ -340,10 +340,6 @@ config ARC_HAS_LLSC
 	default y
 	depends on !ARC_CANT_LLSC
 
-config ARC_HAS_SWAPE
-	bool "Insn: SWAPE (endian-swap)"
-	default y
-
 if ISA_ARCV2
 
 config ARC_USE_UNALIGNED_MEM_ACCESS
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 0c5e6e6314f2..868805ffcfea 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -9,7 +9,7 @@ ifeq ($(CROSS_COMPILE),)
 CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux- arc-linux-gnu-)
 endif
 
-cflags-y	+= -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
+cflags-y	+= -fno-common -pipe -fno-builtin -mmedium-calls -mswape -D__linux__
 
 tune-mcpu-def-$(CONFIG_ISA_ARCOMPACT)	:= -mcpu=arc700
 tune-mcpu-def-$(CONFIG_ISA_ARCV2)	:= -mcpu=hs38
@@ -41,7 +41,6 @@ endif
 cflags-y				+= -fsection-anchors
 
 cflags-$(CONFIG_ARC_HAS_LLSC)		+= -mlock
-cflags-$(CONFIG_ARC_HAS_SWAPE)		+= -mswape
 
 ifdef CONFIG_ISA_ARCV2
 
diff --git a/arch/arc/include/uapi/asm/swab.h b/arch/arc/include/uapi/asm/swab.h
deleted file mode 100644
index 8d1f1ef44ba7..000000000000
--- a/arch/arc/include/uapi/asm/swab.h
+++ /dev/null
@@ -1,99 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * vineetg: May 2011
- *  -Support single cycle endian-swap insn in ARC700 4.10
- *
- * vineetg: June 2009
- *  -Better htonl implementation (5 instead of 9 ALU instructions)
- *  -Hardware assisted single cycle bswap (Use Case of ARC custom instrn)
- */
-
-#ifndef __ASM_ARC_SWAB_H
-#define __ASM_ARC_SWAB_H
-
-#include <linux/types.h>
-
-/* Native single cycle endian swap insn */
-#ifdef CONFIG_ARC_HAS_SWAPE
-
-#define __arch_swab32(x)		\
-({					\
-	unsigned int tmp = x;		\
-	__asm__(			\
-	"	swape	%0, %1	\n"	\
-	: "=r" (tmp)			\
-	: "r" (tmp));			\
-	tmp;				\
-})
-
-#else
-
-/* Several ways of Endian-Swap Emulation for ARC
- * 0: kernel generic
- * 1: ARC optimised "C"
- * 2: ARC Custom instruction
- */
-#define ARC_BSWAP_TYPE	1
-
-#if (ARC_BSWAP_TYPE == 1)		/******* Software only ********/
-
-/* The kernel default implementation of htonl is
- *		return  x<<24 | x>>24 |
- *		 (x & (__u32)0x0000ff00UL)<<8 | (x & (__u32)0x00ff0000UL)>>8;
- *
- * This generates 9 instructions on ARC (excluding the ld/st)
- *
- * 8051fd8c:	ld     r3,[r7,20]	; Mem op : Get the value to be swapped
- * 8051fd98:	asl    r5,r3,24		; get  3rd Byte
- * 8051fd9c:	lsr    r2,r3,24		; get  0th Byte
- * 8051fda0:	and    r4,r3,0xff00
- * 8051fda8:	asl    r4,r4,8		; get 1st Byte
- * 8051fdac:	and    r3,r3,0x00ff0000
- * 8051fdb4:	or     r2,r2,r5		; combine 0th and 3rd Bytes
- * 8051fdb8:	lsr    r3,r3,8		; 2nd Byte at correct place in Dst Reg
- * 8051fdbc:	or     r2,r2,r4		; combine 0,3 Bytes with 1st Byte
- * 8051fdc0:	or     r2,r2,r3		; combine 0,3,1 Bytes with 2nd Byte
- * 8051fdc4:	st     r2,[r1,20]	; Mem op : save result back to mem
- *
- * Joern suggested a better "C" algorithm which is great since
- * (1) It is portable to any architecture
- * (2) At the same time it takes advantage of ARC ISA (rotate intrns)
- */
-
-#define __arch_swab32(x)					\
-({	unsigned long __in = (x), __tmp;			\
-	__tmp = __in << 8 | __in >> 24; /* ror tmp,in,24 */	\
-	__in = __in << 24 | __in >> 8; /* ror in,in,8 */	\
-	__tmp ^= __in;						\
-	__tmp &= 0xff00ff;					\
-	__tmp ^ __in;						\
-})
-
-#elif (ARC_BSWAP_TYPE == 2)	/* Custom single cycle bswap instruction */
-
-#define __arch_swab32(x)						\
-({									\
-	unsigned int tmp = x;						\
-	__asm__(							\
-	"	.extInstruction	bswap, 7, 0x00, SUFFIX_NONE, SYNTAX_2OP	\n"\
-	"	bswap  %0, %1						\n"\
-	: "=r" (tmp)							\
-	: "r" (tmp));							\
-	tmp;								\
-})
-
-#endif /* ARC_BSWAP_TYPE=zzz */
-
-#endif /* CONFIG_ARC_HAS_SWAPE */
-
-#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
-#define __SWAB_64_THRU_32__
-#endif
-
-#endif
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 0e4e939efc94..727f7f82c2c7 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -70,7 +70,6 @@ configs=$(sed -e '
 #
 # The format is <file-name>:<CONFIG-option> in each line.
 config_leak_ignores="
-arch/arc/include/uapi/asm/swab.h:CONFIG_ARC_HAS_SWAPE
 arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8
 arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
 arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT

-- 
2.52.0

Re: [PATCH v2 1/5] ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP

[Nicolas Schier]

[Cc+=linux-kbuild,nathan]

On Mon, Jan 12, 2026 at 08:58:29AM +0100, Thomas Weißschuh wrote:
> Since commit 67a697e7576 ("ARC: retire ARC750 support") all supported
> CPUs have the 'swape' instruction.

I can't find commit 67a697e7576.  Did you mead 
commit 767a697e7576 instead?

Kind regards,
Nicolas

Re: [PATCH v2 1/5] ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP

[Thomas Weißschuh]

On Wed, Jan 21, 2026 at 12:10:18PM +0100, Nicolas Schier wrote:
> [Cc+=linux-kbuild,nathan]
> 
> On Mon, Jan 12, 2026 at 08:58:29AM +0100, Thomas Weißschuh wrote:
> > Since commit 67a697e7576 ("ARC: retire ARC750 support") all supported
> > CPUs have the 'swape' instruction.
> 
> I can't find commit 67a697e7576.  Did you mead 
> commit 767a697e7576 instead?

Yes, indeed.

Thanks for the review!

[PATCH v2 2/5] ARM: uapi: Drop PSR_ENDSTATE

[Thomas Weißschuh]

The symbol PSR_ENDSTATE is pointless for userspace. Drop it from the
UAPI headers and instead inline it into the only two callers.

As as side-effect, remove a leak of an internal kconfig symbol through
the UAPI headers.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/lkml/d2ad12f2-3d65-4bef-890c-65d78a33d790@app.fastmail.com/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/arm/include/asm/processor.h   | 3 ++-
 arch/arm/include/uapi/asm/ptrace.h | 9 ---------
 arch/arm/kernel/signal.c           | 3 ++-
 scripts/headers_install.sh         | 1 -
 4 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h
index 326864f79d18..bba83228bc22 100644
--- a/arch/arm/include/asm/processor.h
+++ b/arch/arm/include/asm/processor.h
@@ -73,7 +73,8 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset,
 		regs->ARM_cpsr = USR26_MODE;				\
 	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
 		regs->ARM_cpsr |= PSR_T_BIT;				\
-	regs->ARM_cpsr |= PSR_ENDSTATE;					\
+	if (IS_ENABLED(CONFIG_CPU_ENDIAN_BE8))				\
+		regs->ARM_cpsr |= PSR_E_BIT;				\
 	regs->ARM_pc = pc & ~1;		/* pc */			\
 	regs->ARM_sp = sp;		/* sp */			\
 })
diff --git a/arch/arm/include/uapi/asm/ptrace.h b/arch/arm/include/uapi/asm/ptrace.h
index 8896c23ccba7..2ef917957005 100644
--- a/arch/arm/include/uapi/asm/ptrace.h
+++ b/arch/arm/include/uapi/asm/ptrace.h
@@ -102,15 +102,6 @@
 #define PSR_IT_MASK	0x0600fc00	/* If-Then execution state mask */
 #define PSR_ENDIAN_MASK	0x00000200	/* Endianness state mask */
 
-/*
- * Default endianness state
- */
-#ifdef CONFIG_CPU_ENDIAN_BE8
-#define PSR_ENDSTATE	PSR_E_BIT
-#else
-#define PSR_ENDSTATE	0
-#endif
-
 /* 
  * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
  * process is located in memory.
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 79a6730fa0eb..7be9188d83d9 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -337,7 +337,8 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
 			return 1;
 	}
 
-	cpsr |= PSR_ENDSTATE;
+	if (IS_ENABLED(CONFIG_CPU_ENDIAN_BE8))
+		cpsr |= PSR_E_BIT;
 
 	/*
 	 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 727f7f82c2c7..4f03521f4026 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -70,7 +70,6 @@ configs=$(sed -e '
 #
 # The format is <file-name>:<CONFIG-option> in each line.
 config_leak_ignores="
-arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8
 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

-- 
2.52.0

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

[Thomas Weißschuh]

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@arndb.de>
Link: https://lore.kernel.org/lkml/93c55086-931a-4282-a94c-de4954047fa9@app.fastmail.com/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.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

[PATCH v2 4/5] x86/uapi: Stop leaking kconfig references to userspace

[Thomas Weißschuh]

UAPI headers are not supposed to leak references to kconfig symbols.
These won't be set when building userspace. Hide the kconfig reference
behind 'if defined(__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@linutronix.de>

---
There is no point in exposing AT_VECTOR_SIZE_ARCH in the UAPI in any
case and I have another series in the works to get rid of it completely.
---
 arch/x86/include/uapi/asm/auxvec.h | 2 +-
 scripts/headers_install.sh         | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/include/uapi/asm/auxvec.h b/arch/x86/include/uapi/asm/auxvec.h
index 6beb55bbefa4..bdde9e18f94e 100644
--- a/arch/x86/include/uapi/asm/auxvec.h
+++ b/arch/x86/include/uapi/asm/auxvec.h
@@ -11,7 +11,7 @@
 #define AT_SYSINFO_EHDR		33
 
 /* entries in ARCH_DLINFO: */
-#if defined(CONFIG_IA32_EMULATION) || !defined(CONFIG_X86_64)
+#if defined(__KERNEL__) && (defined(CONFIG_IA32_EMULATION) || !defined(CONFIG_X86_64))
 # define AT_VECTOR_SIZE_ARCH 3
 #else /* else it's non-compat x86-64 */
 # define AT_VECTOR_SIZE_ARCH 2
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 613f400a67d1..1301ba68d772 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/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
-arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
 "
 
 for c in $configs

-- 
2.52.0

[PATCH v2 5/5] scripts: headers_install.sh: Remove config leak ignore machinery

[Thomas Weißschuh]

There are no entries left to ignore and none should be added again.

Remove the now unused logic.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 scripts/headers_install.sh | 24 ++----------------------
 1 file changed, 2 insertions(+), 22 deletions(-)

diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 1301ba68d772..9c15e748761c 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -64,30 +64,10 @@ configs=$(sed -e '
 	d
 ' $OUTFILE)
 
-# The entries in the following list do not result in an error.
-# Please do not add a new entry. This list is only for existing ones.
-# The list will be reduced gradually, and deleted eventually. (hopefully)
-#
-# The format is <file-name>:<CONFIG-option> in each line.
-config_leak_ignores="
-"
-
 for c in $configs
 do
-	leak_error=1
-
-	for ignore in $config_leak_ignores
-	do
-		if echo "$INFILE:$c" | grep -q "$ignore$"; then
-			leak_error=
-			break
-		fi
-	done
-
-	if [ "$leak_error" = 1 ]; then
-		echo "error: $INFILE: leak $c to user-space" >&2
-		exit 1
-	fi
+	echo "error: $INFILE: leak $c to user-space" >&2
+	exit 1
 done
 
 rm -f $TMPFILE

-- 
2.52.0

Re: [PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[Arnd Bergmann]

On Mon, Jan 12, 2026, at 08:58, Thomas Weißschuh wrote:
> A few UAPI headers still contained references to kconfig symbols.
> Clean them all up and afterwards remove the now useless exception
> machinery in headers_install.sh.
>
> Intended to be routed through the kbuild tree.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---

Whole series

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

I would have preferred cleaning up the x86 auxvec.h header
more, but we can always do that later and your patch not
a regression.

Should I take the series through the asm-generic tree if there
are no other concerns, or do you have other plans for merging it?

      Arnd

Re: [PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[Thomas Weißschuh]

On Mon, Jan 12, 2026 at 11:42:55AM +0100, Arnd Bergmann wrote:
> On Mon, Jan 12, 2026, at 08:58, Thomas Weißschuh wrote:
> > A few UAPI headers still contained references to kconfig symbols.
> > Clean them all up and afterwards remove the now useless exception
> > machinery in headers_install.sh.
> >
> > Intended to be routed through the kbuild tree.
> >
> > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> > ---
> 
> Whole series
> 
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>

Thanks!

(...)

> Should I take the series through the asm-generic tree if there
> are no other concerns, or do you have other plans for merging it?

I had the kbuild tree in mind, but asm-generic sounds equally good.
The asm-generic tree will also be a better fit for my follow-up auxvec.h
series. So let's use that.


Thomas

Re: [PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[Nicolas Schier]

[Cc+=linux-kbuild, nathan]

On Mon, Jan 12, 2026 at 08:58:28AM +0100, Thomas Weißschuh wrote:
> A few UAPI headers still contained references to kconfig symbols.
> Clean them all up and afterwards remove the now useless exception
> machinery in headers_install.sh.
> 
> Intended to be routed through the kbuild tree.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
> Changes in v2:
> - Drop ARC_HAS_SWAPE kconfig option, use ARCH_USE_BUILTIN_BSWAP
> - Drop PSR_ENDSTATE from the ARM ptrace.h header.
> - Drop nios2 uapi asm/swab.h.
> - Link to v1: https://lore.kernel.org/r/20251230-headers_install-config-leak-v1-0-efba5c58073d@linutronix.de
> 
> ---
> Thomas Weißschuh (5):
>       ARC: Always use SWAPE instructions and enable ARCH_USE_BUILTIN_BSWAP
>       ARM: uapi: Drop PSR_ENDSTATE
>       nios2: uapi: Remove custom asm/swab.h from UAPI
>       x86/uapi: Stop leaking kconfig references to userspace
>       scripts: headers_install.sh: Remove config leak ignore machinery
> 
>  arch/arc/Kconfig                         |  6 +-
>  arch/arc/Makefile                        |  3 +-
>  arch/arc/include/uapi/asm/swab.h         | 99 --------------------------------
>  arch/arm/include/asm/processor.h         |  3 +-
>  arch/arm/include/uapi/asm/ptrace.h       |  9 ---
>  arch/arm/kernel/signal.c                 |  3 +-
>  arch/nios2/include/{uapi => }/asm/swab.h |  0
>  arch/x86/include/uapi/asm/auxvec.h       |  2 +-
>  scripts/headers_install.sh               | 30 +---------
>  9 files changed, 9 insertions(+), 146 deletions(-)
> ---
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> change-id: 20251229-headers_install-config-leak-b8a9219d8b3c
> 
> Best regards,
> -- 
> Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Thanks a lot for the cleanup, much appreciated!

Reviewed-by: Nicolas Schier <nsc@kernel.org> # kbuild

Kind regards,
Nicolas

Re: [PATCH v2 0/5] uapi: fix remaining kconfig leaks in UAPI headers

[Nathan Chancellor]

On Wed, Jan 21, 2026 at 12:17:04PM +0100, Nicolas Schier wrote:
> On Mon, Jan 12, 2026 at 08:58:28AM +0100, Thomas Weißschuh wrote:
> > A few UAPI headers still contained references to kconfig symbols.
> > Clean them all up and afterwards remove the now useless exception
> > machinery in headers_install.sh.
> > 
> > Intended to be routed through the kbuild tree.

Based on [1], I am going to assume that Arnd will be picking this up via
the asm-generic tree but if you want me to take it via kbuild-next, just
let me know.

[1]: https://lore.kernel.org/20260112114744-21ac730f-68b4-4f92-9ac0-f4dc6c5bb880@linutronix.de/

Cheers,
Nathan