{"id":2221793,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2221793/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120317.642797961@kernel.org/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<20260410120317.642797961@kernel.org>","date":"2026-04-10T12:18:32","name":"[01/38] percpu: Sanitize __percpu_qual include hell","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a3773f87c5f5b28b99c6c05ad15ff1c2f679d0ef","submitter":{"id":92397,"url":"http://patchwork.ozlabs.org/api/1.1/people/92397/?format=json","name":"Thomas Gleixner","email":"tglx@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120317.642797961@kernel.org/mbox/","series":[{"id":499449,"url":"http://patchwork.ozlabs.org/api/1.1/series/499449/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499449","date":"2026-04-10T12:18:27","name":"treewide: Cleanup LATCH, CLOCK_TICK_RATE and get_cycles() [ab]use","version":1,"mbox":"http://patchwork.ozlabs.org/series/499449/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221793/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221793/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=PujwWQLA;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=PujwWQLA; dkim-atps=neutral;\n spf=pass (client-ip=172.234.252.31; helo=sea.source.kernel.org;\n envelope-from=tglx@kernel.org;\n receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823515;\n\tbh=Qxe5s7KoLSq5kG1N2smycXiRWybB8taeJTlNsbfy0fg=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=PujwWQLA2dOIyLlZvIM0oB1Wg7c5ZIyCwzH/XHGNRGehg+YFil6OmFstHyfDwz6a4\n\t UXi7viGoUKPW4HP65M0H75qRplTYAji9Z6ikhUQOkcZXvM13Netjmq5O6I/+9+JQ+w\n\t bxUrL+dmChTEREYE3VSmYBwXmygVivr7jmb4e0itrCIHXq31ae3WiG49uZ0Z2PTGdc\n\t +od1M1yaD34oi/oFSPoyZ73JAQOxw0kf9oLJ4YVR9wqn75mlEWMpZuBIxST6yrXcHs\n\t fYRNY0LFjGxQtZU4+RTQobyzbJWEzJNsARBCqXSJyY40dbr06WXMHmkuYa6yNGx2XV\n\t 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 ,\n x86@kernel.org,\n Lu Baolu ,\n iommu@lists.linux.dev,\n Michael Grzeschik ,\n netdev@vger.kernel.org,\n linux-wireless@vger.kernel.org,\n Herbert Xu ,\n linux-crypto@vger.kernel.org,\n Vlastimil Babka ,\n linux-mm@kvack.org,\n David Woodhouse ,\n Bernie Thompson ,\n linux-fbdev@vger.kernel.org,\n \"Theodore Tso\" ,\n linux-ext4@vger.kernel.org,\n Andrew Morton ,\n Uladzislau Rezki ,\n Marco Elver ,\n Dmitry Vyukov ,\n kasan-dev@googlegroups.com,\n Andrey Ryabinin ,\n Thomas Sailer ,\n linux-hams@vger.kernel.org,\n \"Jason A. Donenfeld\" ,\n Richard Henderson ,\n linux-alpha@vger.kernel.org,\n Russell King ,\n linux-arm-kernel@lists.infradead.org,\n Catalin Marinas ,\n Huacai Chen ,\n loongarch@lists.linux.dev,\n Geert Uytterhoeven ,\n linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen ,\n Jonas Bonn ,\n linux-openrisc@vger.kernel.org,\n Helge Deller ,\n linux-parisc@vger.kernel.org,\n Michael Ellerman ,\n linuxppc-dev@lists.ozlabs.org,\n Paul Walmsley ,\n linux-riscv@lists.infradead.org,\n Heiko Carstens ,\n linux-s390@vger.kernel.org,\n \"David S. Miller\" ,\n sparclinux@vger.kernel.org","Subject":"[patch 01/38] percpu: Sanitize __percpu_qual include hell","References":"<20260410120044.031381086@kernel.org>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"Slapping __percpu_qual into the next available header is sloppy at best.\n\nIt's required by __percpu which is defined in compiler_types.h and that is\nmeant to be included without requiring a boatload of other headers so that\na struct or function declaration can contain a __percpu qualifier w/o\nfurther prerequisites.\n\nThis implicit dependency on linux/percpu.h makes that impossible and causes\na major problem when trying to seperate headers.\n\nCreate asm/percpu_types.h and move it there. Include that from\ncompiler_types.h and the whole recursion problem goes away.\n\nSigned-off-by: Thomas Gleixner \n---\n arch/x86/include/asm/percpu.h | 5 -----\n arch/x86/include/asm/percpu_types.h | 17 +++++++++++++++++\n include/asm-generic/Kbuild | 1 +\n include/asm-generic/percpu_types.h | 20 ++++++++++++++++++++\n include/linux/compiler_types.h | 1 +\n 5 files changed, 39 insertions(+), 5 deletions(-)","diff":"--- a/arch/x86/include/asm/percpu.h\n+++ b/arch/x86/include/asm/percpu.h\n@@ -40,12 +40,10 @@\n #endif\n \n #define __percpu_prefix\n-#define __percpu_seg_override\tCONCATENATE(__seg_, __percpu_seg)\n \n #else /* !CONFIG_CC_HAS_NAMED_AS: */\n \n #define __percpu_prefix\t\t__force_percpu_prefix\n-#define __percpu_seg_override\n \n #endif /* CONFIG_CC_HAS_NAMED_AS */\n \n@@ -82,7 +80,6 @@\n \n #define __force_percpu_prefix\n #define __percpu_prefix\n-#define __percpu_seg_override\n \n #define PER_CPU_VAR(var)\t(var)__percpu_rel\n \n@@ -92,8 +89,6 @@\n # define __my_cpu_type(var)\ttypeof(var)\n # define __my_cpu_ptr(ptr)\t(ptr)\n # define __my_cpu_var(var)\t(var)\n-\n-# define __percpu_qual\t\t__percpu_seg_override\n #else\n # define __my_cpu_type(var)\ttypeof(var) __percpu_seg_override\n # define __my_cpu_ptr(ptr)\t(__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr)\n--- /dev/null\n+++ b/arch/x86/include/asm/percpu_types.h\n@@ -0,0 +1,17 @@\n+/* SPDX-License-Identifier: GPL-2.0 */\n+#ifndef _ASM_X86_PERCPU_TYPES_H\n+#define _ASM_X86_PERCPU_TYPES_H\n+\n+#if defined(CONFIG_SMP) && defined(CONFIG_CC_HAS_NAMED_AS)\n+#define __percpu_seg_override\tCONCATENATE(__seg_, __percpu_seg)\n+#else /* !CONFIG_CC_HAS_NAMED_AS: */\n+#define __percpu_seg_override\n+#endif\n+\n+#if defined(CONFIG_USE_X86_SEG_SUPPORT) && defined(USE_TYPEOF_UNQUAL)\n+#define __percpu_qual\t\t__percpu_seg_override\n+#endif\n+\n+#include \n+\n+#endif\n--- a/include/asm-generic/Kbuild\n+++ b/include/asm-generic/Kbuild\n@@ -44,6 +44,7 @@ mandatory-y += module.lds.h\n mandatory-y += msi.h\n mandatory-y += pci.h\n mandatory-y += percpu.h\n+mandatory-y += percpu_types.h\n mandatory-y += pgalloc.h\n mandatory-y += preempt.h\n mandatory-y += rqspinlock.h\n--- /dev/null\n+++ b/include/asm-generic/percpu_types.h\n@@ -0,0 +1,20 @@\n+/* SPDX-License-Identifier: GPL-2.0 */\n+#ifndef _ASM_GENERIC_PERCPU_TYPES_H_\n+#define _ASM_GENERIC_PERCPU_TYPES_H_\n+\n+#ifndef __ASSEMBLER__\n+/*\n+ * __percpu_qual is the qualifier for the percpu named address space.\n+ *\n+ * Most arches use generic named address space for percpu variables but\n+ * some arches define percpu variables in different named address space\n+ * (on the x86 arch, percpu variable may be declared as being relative\n+ * to the %fs or %gs segments using __seg_fs or __seg_gs named address\n+ * space qualifier).\n+ */\n+#ifndef __percpu_qual\n+# define __percpu_qual\n+#endif\n+\n+#endif /* __ASSEMBLER__ */\n+#endif /* _ASM_GENERIC_PERCPU_TYPES_H_ */\n--- a/include/linux/compiler_types.h\n+++ b/include/linux/compiler_types.h\n@@ -41,6 +41,7 @@\n # define BTF_TYPE_TAG(value) /* nothing */\n #endif\n \n+#include \n #include \n \n /* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */\n","prefixes":["01/38"]}