From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CDEF3A3E8D; Fri, 10 Apr 2026 12:18:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775823516; cv=none; b=mV1EwIWrnJjKV4EN0w82wQhK11qezHqqED77RRYJ1/82o7EczF5P//rhn8aqmaLZhK0/GLwShT3E3Tn7Y3YaHF8Ckn7/gZpdakiowsYYzRC0+tx3wZPsYXY65MjUNYEHknXeZE7FrKIdc1UE/g3FR8gosbq1elgZD2CWuLPI8V0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775823516; c=relaxed/simple; bh=Qxe5s7KoLSq5kG1N2smycXiRWybB8taeJTlNsbfy0fg=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=SuYLMO6gKlYYvAnjNGuRqiJ1pqLOOSrsBWh/ho6wjg28d+dFAU98jwoW55HsI1Vo9BBL6pZWqXbP75Ot9vOnl+jSewq0Cb3eDtr1wFOcbn4/eWCwK1LuXA74f2tw97ebuWz8tftzHX/ItaYBZR71Ve7WfuvG4DT598LWvUeYB+g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PujwWQLA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PujwWQLA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4DF48C2BC87; Fri, 10 Apr 2026 12:18:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775823515; bh=Qxe5s7KoLSq5kG1N2smycXiRWybB8taeJTlNsbfy0fg=; h=Date:From:To:Cc:Subject:References:From; b=PujwWQLA2dOIyLlZvIM0oB1Wg7c5ZIyCwzH/XHGNRGehg+YFil6OmFstHyfDwz6a4 UXi7viGoUKPW4HP65M0H75qRplTYAji9Z6ikhUQOkcZXvM13Netjmq5O6I/+9+JQ+w bxUrL+dmChTEREYE3VSmYBwXmygVivr7jmb4e0itrCIHXq31ae3WiG49uZ0Z2PTGdc +od1M1yaD34oi/oFSPoyZ73JAQOxw0kf9oLJ4YVR9wqn75mlEWMpZuBIxST6yrXcHs fYRNY0LFjGxQtZU4+RTQobyzbJWEzJNsARBCqXSJyY40dbr06WXMHmkuYa6yNGx2XV 5kZ5/s9dunCZA== Date: Fri, 10 Apr 2026 14:18:32 +0200 Message-ID: <20260410120317.642797961@kernel.org> User-Agent: quilt/0.68 From: Thomas Gleixner To: LKML Cc: Arnd Bergmann , x86@kernel.org, Lu Baolu , iommu@lists.linux.dev, Michael Grzeschik , netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Herbert Xu , linux-crypto@vger.kernel.org, Vlastimil Babka , linux-mm@kvack.org, David Woodhouse , Bernie Thompson , linux-fbdev@vger.kernel.org, "Theodore Tso" , linux-ext4@vger.kernel.org, Andrew Morton , Uladzislau Rezki , Marco Elver , Dmitry Vyukov , kasan-dev@googlegroups.com, Andrey Ryabinin , Thomas Sailer , linux-hams@vger.kernel.org, "Jason A. Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Huacai Chen , loongarch@lists.linux.dev, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Dinh Nguyen , Jonas Bonn , linux-openrisc@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , linux-riscv@lists.infradead.org, Heiko Carstens , linux-s390@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org Subject: [patch 01/38] percpu: Sanitize __percpu_qual include hell References: <20260410120044.031381086@kernel.org> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Slapping __percpu_qual into the next available header is sloppy at best. It's required by __percpu which is defined in compiler_types.h and that is meant to be included without requiring a boatload of other headers so that a struct or function declaration can contain a __percpu qualifier w/o further prerequisites. This implicit dependency on linux/percpu.h makes that impossible and causes a major problem when trying to seperate headers. Create asm/percpu_types.h and move it there. Include that from compiler_types.h and the whole recursion problem goes away. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/percpu.h | 5 ----- arch/x86/include/asm/percpu_types.h | 17 +++++++++++++++++ include/asm-generic/Kbuild | 1 + include/asm-generic/percpu_types.h | 20 ++++++++++++++++++++ include/linux/compiler_types.h | 1 + 5 files changed, 39 insertions(+), 5 deletions(-) --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -40,12 +40,10 @@ #endif #define __percpu_prefix -#define __percpu_seg_override CONCATENATE(__seg_, __percpu_seg) #else /* !CONFIG_CC_HAS_NAMED_AS: */ #define __percpu_prefix __force_percpu_prefix -#define __percpu_seg_override #endif /* CONFIG_CC_HAS_NAMED_AS */ @@ -82,7 +80,6 @@ #define __force_percpu_prefix #define __percpu_prefix -#define __percpu_seg_override #define PER_CPU_VAR(var) (var)__percpu_rel @@ -92,8 +89,6 @@ # define __my_cpu_type(var) typeof(var) # define __my_cpu_ptr(ptr) (ptr) # define __my_cpu_var(var) (var) - -# define __percpu_qual __percpu_seg_override #else # define __my_cpu_type(var) typeof(var) __percpu_seg_override # define __my_cpu_ptr(ptr) (__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr) --- /dev/null +++ b/arch/x86/include/asm/percpu_types.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_PERCPU_TYPES_H +#define _ASM_X86_PERCPU_TYPES_H + +#if defined(CONFIG_SMP) && defined(CONFIG_CC_HAS_NAMED_AS) +#define __percpu_seg_override CONCATENATE(__seg_, __percpu_seg) +#else /* !CONFIG_CC_HAS_NAMED_AS: */ +#define __percpu_seg_override +#endif + +#if defined(CONFIG_USE_X86_SEG_SUPPORT) && defined(USE_TYPEOF_UNQUAL) +#define __percpu_qual __percpu_seg_override +#endif + +#include + +#endif --- a/include/asm-generic/Kbuild +++ b/include/asm-generic/Kbuild @@ -44,6 +44,7 @@ mandatory-y += module.lds.h mandatory-y += msi.h mandatory-y += pci.h mandatory-y += percpu.h +mandatory-y += percpu_types.h mandatory-y += pgalloc.h mandatory-y += preempt.h mandatory-y += rqspinlock.h --- /dev/null +++ b/include/asm-generic/percpu_types.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_PERCPU_TYPES_H_ +#define _ASM_GENERIC_PERCPU_TYPES_H_ + +#ifndef __ASSEMBLER__ +/* + * __percpu_qual is the qualifier for the percpu named address space. + * + * Most arches use generic named address space for percpu variables but + * some arches define percpu variables in different named address space + * (on the x86 arch, percpu variable may be declared as being relative + * to the %fs or %gs segments using __seg_fs or __seg_gs named address + * space qualifier). + */ +#ifndef __percpu_qual +# define __percpu_qual +#endif + +#endif /* __ASSEMBLER__ */ +#endif /* _ASM_GENERIC_PERCPU_TYPES_H_ */ --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -41,6 +41,7 @@ # define BTF_TYPE_TAG(value) /* nothing */ #endif +#include #include /* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */