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For the same reasons, all the functions in the dynamic extents of core_kernel_text should be marked as notrace. Cc: Marcin Nowakowski Signed-off-by: Nadav Amit --- arch/arm/kernel/process.c | 2 +- arch/ia64/mm/init.c | 2 +- arch/x86/entry/vsyscall/vsyscall_64.c | 2 +- arch/x86/um/mem_32.c | 2 +- include/asm-generic/sections.h | 6 +++--- include/linux/kallsyms.h | 6 +++--- include/linux/mm.h | 2 +- 7 files changed, 11 insertions(+), 11 deletions(-) diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 0e8ff85890ad..a8c0d0a06664 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -330,7 +330,7 @@ int in_gate_area(struct mm_struct *mm, unsigned long ad= dr) return (addr >=3D gate_vma.vm_start) && (addr < gate_vma.vm_end); } =20 -int in_gate_area_no_mm(unsigned long addr) +notrace int in_gate_area_no_mm(unsigned long addr) { return in_gate_area(NULL, addr); } diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index 7f5353e28516..6dbd3acbe837 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -284,7 +284,7 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *m= m) return &gate_vma; } =20 -int in_gate_area_no_mm(unsigned long addr) +notrace int in_gate_area_no_mm(unsigned long addr) { if ((addr >=3D FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) return 1; diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscal= l/vsyscall_64.c index e0ca8120aea8..2d1d09877f0c 100644 --- a/arch/x86/entry/vsyscall/vsyscall_64.c +++ b/arch/x86/entry/vsyscall/vsyscall_64.c @@ -340,7 +340,7 @@ int in_gate_area(struct mm_struct *mm, unsigned long ad= dr) * context. It is less reliable than using a task's mm and may give * false positives. */ -int in_gate_area_no_mm(unsigned long addr) +notrace int in_gate_area_no_mm(unsigned long addr) { return vsyscall_mode !=3D NONE && (addr & PAGE_MASK) =3D=3D VSYSCALL_ADDR; } diff --git a/arch/x86/um/mem_32.c b/arch/x86/um/mem_32.c index 29b2203bc82c..1f92840af2f3 100644 --- a/arch/x86/um/mem_32.c +++ b/arch/x86/um/mem_32.c @@ -28,7 +28,7 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *mm) return FIXADDR_USER_START ? &gate_vma : NULL; } =20 -int in_gate_area_no_mm(unsigned long addr) +notrace int in_gate_area_no_mm(unsigned long addr) { if (!FIXADDR_USER_START) return 0; diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index db13bb620f52..d519965b67bf 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -188,7 +188,7 @@ static inline bool is_kernel_rodata(unsigned long addr) * * Returns: true if the address is located in .init.text, false otherwise. */ -static inline bool is_kernel_inittext(unsigned long addr) +static notrace inline bool is_kernel_inittext(unsigned long addr) { return addr >=3D (unsigned long)_sinittext && addr < (unsigned long)_einittext; @@ -203,7 +203,7 @@ static inline bool is_kernel_inittext(unsigned long add= r) * Returns: true if the address is located in .text, false otherwise. * Note: an internal helper, only check the range of _stext to _etext. */ -static inline bool __is_kernel_text(unsigned long addr) +static notrace inline bool __is_kernel_text(unsigned long addr) { return addr >=3D (unsigned long)_stext && addr < (unsigned long)_etext; @@ -219,7 +219,7 @@ static inline bool __is_kernel_text(unsigned long addr) * and range from __init_begin to __init_end, which can be outside * of the _stext to _end range. */ -static inline bool __is_kernel(unsigned long addr) +static notrace inline bool __is_kernel(unsigned long addr) { return ((addr >=3D (unsigned long)_stext && addr < (unsigned long)_end) || diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h index fe3c9993b5bf..e11743e68124 100644 --- a/include/linux/kallsyms.h +++ b/include/linux/kallsyms.h @@ -24,21 +24,21 @@ struct cred; struct module; =20 -static inline int is_kernel_text(unsigned long addr) +static notrace inline int is_kernel_text(unsigned long addr) { if (__is_kernel_text(addr)) return 1; return in_gate_area_no_mm(addr); } =20 -static inline int is_kernel(unsigned long addr) +static notrace inline int is_kernel(unsigned long addr) { if (__is_kernel(addr)) return 1; return in_gate_area_no_mm(addr); } =20 -static inline int is_ksym_addr(unsigned long addr) +static notrace inline int is_ksym_addr(unsigned long addr) { if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) return is_kernel(addr); diff --git a/include/linux/mm.h b/include/linux/mm.h index 27ce77080c79..e71ea764659c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3485,7 +3485,7 @@ static inline struct vm_area_struct *get_gate_vma(str= uct mm_struct *mm) { return NULL; } -static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } +static notrace inline int in_gate_area_no_mm(unsigned long addr) { return = 0; } static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) { return 0; --=20 2.25.1 From nobody Sat Feb 7 23:23:03 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5492AC77B7E for ; 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Thu, 25 May 2023 14:00:59 -0700 (PDT) Received: from sc2-haas01-esx0118.eng.vmware.com ([66.170.99.1]) by smtp.gmail.com with ESMTPSA id j21-20020a170902c3d500b001ae8587d60csm1807673plj.265.2023.05.25.14.00.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 May 2023 14:00:58 -0700 (PDT) From: Nadav Amit X-Google-Original-From: Nadav Amit To: Steven Rostedt , "Arnd Bergmann" , "Thomas Gleixner" Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-um@lists.infradead.org, Linux-Arch , linux-mm@kvack.org, "Andy Lutomirski" , "Ingo Molnar" , "Dave Hansen" , "Borislav Petkov" , x86@kernel.org, Peter Zijlstra , Nadav Amit Subject: [PATCH v2 2/3] compiler: inline does not imply notrace Date: Thu, 25 May 2023 14:00:39 -0700 Message-Id: <20230525210040.3637-3-namit@vmware.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230525210040.3637-1-namit@vmware.com> References: <20230525210040.3637-1-namit@vmware.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Nadav Amit Functions that are marked as "inline" are currently also not tracable. This limits tracing functionality for many functions for no reason. Apparently, this has been done for two reasons. First, as described in commit 5963e317b1e9d2a ("ftrace/x86: Do not change stacks in DEBUG when calling lockdep"), it was intended to prevent some functions that cannot be traced from being traced as these functions were marked as inline (among others). Yet, this change has been done a decade ago, and according to Steven Rostedt, ftrace should have improved and hopefully resolved nested tracing issues by now. Arguably, if functions that should be traced - for instance since they are used during tracing - still exist, they should be marked as notrace explicitly. The second reason, which Steven raised, is that attaching "notrace" to "inline" prevented tracing differences between different configs, which caused various problem. This consideration is not very strong, and tying "inline" and "notrace" does not seem very beneficial. The "inline" keyword is just a hint, and many functions are currently not tracable due to this reason. Disconnect "inline" from "notrace". Signed-off-by: Nadav Amit --- include/linux/compiler_types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 547ea1ff806e..bab3e25bbe3f 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -184,7 +184,7 @@ struct ftrace_likely_data { * of extern inline functions at link time. * A lot of inline functions can cause havoc with function tracing. */ -#define inline inline __gnu_inline __inline_maybe_unused notrace +#define inline inline __gnu_inline __inline_maybe_unused =20 /* * gcc provides both __inline__ and __inline as alternate spellings of --=20 2.25.1 From nobody Sat Feb 7 23:23:03 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C196BC77B7A for ; Thu, 25 May 2023 21:01:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241154AbjEYVBT (ORCPT ); Thu, 25 May 2023 17:01:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232203AbjEYVBI (ORCPT ); Thu, 25 May 2023 17:01:08 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55B961B6; Thu, 25 May 2023 14:01:01 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id 41be03b00d2f7-53f448cde66so263a12.1; Thu, 25 May 2023 14:01:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1685048461; x=1687640461; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5+zfwXmZs7on+rhgyTI9s9jH0CR5rkGZ9aJZCDn5M88=; b=mU7K5hQEZ44NsT0+5VXofyw6qEDSPgD8wBkX7n613X0GzbWLqpmZC3VJfMwNx6m/tq nnfiSAnDqXg2POPsu6CCB/gzZ0hd00mUuaPE+wCpcwaSz8z7oc89KKDtJz7qu8LL0mFn S+jgvx9ju/DapGofobgM+AK3Axd4+Sc4U5KjNwRTJHheCODSmqZjtYzqbwgiWlD2FgMF srcMN9K8JH7pV8rjvzbVKic2ZONIx6t1veprRCepvX3TDcKPRo9Y07bOKmCyV0LvyjJw gbGeTnFOlGb6asM++1XIHud54i9VTyzPItSSun7x2eo35b2AKXgtMS5KXFv8bAflCIg7 ysIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685048461; x=1687640461; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5+zfwXmZs7on+rhgyTI9s9jH0CR5rkGZ9aJZCDn5M88=; b=Plew69F6gnqLSoJ/bbamJq5mgfBLeVEz9Rdy5MwzAohMxJ9piwR8FFzFcpyjGmW5Fp u9AtrakaxQq1r2CE/ghuzCMdlZWMsb6qsuKdZQcGyCjH6bEaQSCQjOcSi9SlZ0C3jQH4 GxUSQD/quw7iE39aL8w4RV+Wpro6NUsq4B378ECBxsahe6IsldWaZdHuVKkzfiyoE9k+ J8lLG2s09IzXJgHqHI5IJhvyRtIUdns80X2XsgH4LvbFICQ9/xPM5CjQtIS7JpwA7jfK P6yp6tDKGcme+UK+bmXQwwODiBhL9IcWhfUrOJ9s8cpKsmnqNAgRcqry3XxQhTSgg2mb 7HsQ== X-Gm-Message-State: AC+VfDxGyW/Ww9ig3e/9e5AF/wXqL8nUQW1SV6uuHeRoObIf1K+n/5GK KpsMqRxNS+jw/7zUVxADnK8= X-Google-Smtp-Source: ACHHUZ7dglrnNdSeCZIQSBsgjYjSTe3LSjFgTqSJchshPoXy4Vr4Jx151LniJF1AA47jpF5mynMU7w== X-Received: by 2002:a17:902:e810:b0:1ac:5c90:23e with SMTP id u16-20020a170902e81000b001ac5c90023emr71805plg.7.1685048460660; Thu, 25 May 2023 14:01:00 -0700 (PDT) Received: from sc2-haas01-esx0118.eng.vmware.com ([66.170.99.1]) by smtp.gmail.com with ESMTPSA id j21-20020a170902c3d500b001ae8587d60csm1807673plj.265.2023.05.25.14.00.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 May 2023 14:01:00 -0700 (PDT) From: Nadav Amit X-Google-Original-From: Nadav Amit To: Steven Rostedt , "Arnd Bergmann" , "Thomas Gleixner" Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-um@lists.infradead.org, Linux-Arch , linux-mm@kvack.org, "Andy Lutomirski" , "Ingo Molnar" , "Dave Hansen" , "Borislav Petkov" , x86@kernel.org, Peter Zijlstra , Nadav Amit Subject: [PATCH v2 3/3] lib: Allow traceing of usercopy, xarray, iov_iter, find_bit Date: Thu, 25 May 2023 14:00:40 -0700 Message-Id: <20230525210040.3637-4-namit@vmware.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230525210040.3637-1-namit@vmware.com> References: <20230525210040.3637-1-namit@vmware.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Nadav Amit There is no reason not to allow the use of ftrace for usercopy, xarray and iov_iter. Enable tracing for these compilation unit. Signed-off-by: Nadav Amit --- lib/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/Makefile b/lib/Makefile index 876fcdeae34e..00450e1cc97d 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -27,6 +27,9 @@ KASAN_SANITIZE_string.o :=3D n CFLAGS_string.o +=3D -fno-stack-protector endif =20 +CFLAGS_xarray.o +=3D $(CC_FLAGS_FTRACE) +CFLAGS_iov_iter.o +=3D $(CC_FLAGS_FTRACE) + lib-y :=3D ctype.o string.o vsprintf.o cmdline.o \ rbtree.o radix-tree.o timerqueue.o xarray.o \ maple_tree.o idr.o extable.o irq_regs.o argv_split.o \ @@ -42,6 +45,8 @@ lib-$(CONFIG_SMP) +=3D cpumask.o lib-y +=3D kobject.o klist.o obj-y +=3D lockref.o =20 +CFLAGS_usercopy.o +=3D $(CC_FLAGS_FTRACE) +CFLAGS_find_bit.o +=3D $(CC_FLAGS_FTRACE) obj-y +=3D bcd.o sort.o parser.o debug_locks.o random32.o \ bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \ list_sort.o uuid.o iov_iter.o clz_ctz.o \ --=20 2.25.1