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 7352E3382D6; Sat, 28 Feb 2026 18:01:11 +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=1772301671; cv=none; b=sN+I7RfkcERKIHdbBMoJXN/uf2zOlbQSXm/MLpfnzSGbUuShJSwnnyFjg26yTAnMLC6abzlLht/p4ujkOVz0P1lNH/bJcE/nojJcc5PS6jj10VtX2wzViU+byZc9GpHDxKdd+qRo8JJzXQBRZLCGI2CwCStDP0fJMiva0mN6GqE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772301671; c=relaxed/simple; bh=KeoTj/Lb2emls8WbT/DfiGvKNGnic/tpCc5Nk4Fi6PI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UHKEDT1oTmXCFEYzwCKX1i17HvdRcMo7srpnxrayN5bulcjuFGMCWI0mz8NGnL/ZwhviTOEptiJGCIAkpl0exKGwwtaILhFZy5yksOPmqqb9PURPY+56XazccgsgF1swfkbgU56JhMuUCAy4ZjFx8yT4tmT5doXtWm3rF3GU9Kg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=joyFopgp; 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="joyFopgp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE620C116D0; Sat, 28 Feb 2026 18:01:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772301671; bh=KeoTj/Lb2emls8WbT/DfiGvKNGnic/tpCc5Nk4Fi6PI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=joyFopgpuGbZlm85FvuhxgaLdKdvCyK/7Nt6MC7V7qJpfx3IE4uAthXemxrK20NaC EZhLwOnrdL0/bYtrpauzHAHlWDCIIKo1hjPJgrcnh+F/T5jzhB02DNbED8vfBRtrxZ Rx7idio7uElpongG2kzksg6z/gwIjyrJjqqq/zk4e3YbUHQKRcu++88/ATHWSMNcLT r3vbKLhbQIXuauccI6HzbDd9EsYwuwLejSuZpcXU5FvOgOlRViwnYhPB4ECiJAMuEw MYHCGnQCAxJtHI+SpEuZBjbtzIW11lbVriWN7gdc40vCDdcyuVQ88gMeEb2chWbZ/4 4wT0e3ubkTL3w== From: Sasha Levin To: patches@lists.linux.dev Cc: Steven Rostedt , linux-arch@vger.kernel.org, "x86@kernel.org" , Mathieu Desnoyers , Mark Rutland , Will Deacon , Huacai Chen , WANG Xuerui , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "Masami Hiramatsu (Google)" , Catalin Marinas , Sasha Levin Subject: [PATCH 6.12 066/385] ftrace: Consolidate ftrace_regs accessor functions for archs using pt_regs Date: Sat, 28 Feb 2026 12:54:48 -0500 Message-ID: <20260228180011.1568201-66-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228180011.1568201-1-sashal@kernel.org> References: <20260228180011.1568201-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Steven Rostedt [ Upstream commit e4cf33ca48128d580e25ebe779b7ba7b4b4cf733 ] Most architectures use pt_regs within ftrace_regs making a lot of the accessor functions just calls to the pt_regs internally. Instead of duplication this effort, use a HAVE_ARCH_FTRACE_REGS for architectures that have their own ftrace_regs that is not based on pt_regs and will define all the accessor functions, and for the architectures that just use pt_regs, it will leave it undefined, and the default accessor functions will be used. Note, this will also make it easier to add new accessor functions to ftrace_regs as it will mean having to touch less architectures. Cc: Cc: "x86@kernel.org" Cc: Mathieu Desnoyers Cc: Mark Rutland Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Naveen N Rao Cc: Madhavan Srinivasan Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Link: https://lore.kernel.org/20241010202114.2289f6fd@gandalf.local.home Acked-by: Masami Hiramatsu (Google) Acked-by: Heiko Carstens # s390 Acked-by: Catalin Marinas Acked-by: Michael Ellerman # powerpc Suggested-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) Stable-dep-of: aea251799998 ("x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path") Signed-off-by: Sasha Levin --- arch/arm64/include/asm/ftrace.h | 1 + arch/loongarch/include/asm/ftrace.h | 25 +------------------- arch/powerpc/include/asm/ftrace.h | 26 +-------------------- arch/riscv/include/asm/ftrace.h | 1 + arch/s390/include/asm/ftrace.h | 26 +-------------------- arch/x86/include/asm/ftrace.h | 21 +---------------- include/linux/ftrace.h | 32 ++++++------------------- include/linux/ftrace_regs.h | 36 +++++++++++++++++++++++++++++ 8 files changed, 49 insertions(+), 119 deletions(-) create mode 100644 include/linux/ftrace_regs.h diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index bbb69c7751b99..5ccff4de7f091 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -54,6 +54,7 @@ extern void return_to_handler(void); unsigned long ftrace_call_adjust(unsigned long addr); #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS +#define HAVE_ARCH_FTRACE_REGS struct dyn_ftrace; struct ftrace_ops; struct ftrace_regs; diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h index 0e15d36ce2512..8f13eaeaa3251 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -43,43 +43,20 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent); #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS struct ftrace_ops; -struct ftrace_regs; -#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) -struct __arch_ftrace_regs { - struct pt_regs regs; -}; +#include static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) { return &arch_ftrace_regs(fregs)->regs; } -static __always_inline unsigned long -ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs) -{ - return instruction_pointer(&arch_ftrace_regs(fregs)->regs); -} - static __always_inline void ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, unsigned long ip) { instruction_pointer_set(&arch_ftrace_regs(fregs)->regs, ip); } -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(&arch_ftrace_regs(fregs)->regs, n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(&arch_ftrace_regs(fregs)->regs, ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) - #define ftrace_graph_func ftrace_graph_func void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs); diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index e299fd47d2014..0edfb874eb02b 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -32,12 +32,7 @@ struct dyn_arch_ftrace { int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop -struct ftrace_regs; -#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) - -struct __arch_ftrace_regs { - struct pt_regs regs; -}; +#include static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) { @@ -52,25 +47,6 @@ ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, regs_set_return_ip(&arch_ftrace_regs(fregs)->regs, ip); } -static __always_inline unsigned long -ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs) -{ - return instruction_pointer(&arch_ftrace_regs(fregs)->regs); -} - -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(&arch_ftrace_regs(fregs)->regs, n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(&arch_ftrace_regs(fregs)->regs, ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) - struct ftrace_ops; #define ftrace_graph_func ftrace_graph_func diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index 8a97ce5077e73..af174ea0c9451 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -125,6 +125,7 @@ int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS #define arch_ftrace_get_regs(regs) NULL +#define HAVE_ARCH_FTRACE_REGS struct ftrace_ops; struct ftrace_regs; #define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 1498d0a9c7625..fc97d75dc752c 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -51,12 +51,7 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) return addr; } -struct ftrace_regs; -#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) - -struct __arch_ftrace_regs { - struct pt_regs regs; -}; +#include static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) { @@ -84,12 +79,6 @@ static __always_inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ -static __always_inline unsigned long -ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs) -{ - return arch_ftrace_regs(fregs)->regs.psw.addr; -} - static __always_inline void ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, unsigned long ip) @@ -97,19 +86,6 @@ ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, arch_ftrace_regs(fregs)->regs.psw.addr = ip; } -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(&arch_ftrace_regs(fregs)->regs, n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(&arch_ftrace_regs(fregs)->regs, ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) - #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS /* * When an ftrace registered caller is tracing a function that is diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h index 62fed5547c2e1..6e8cf0fa48fc6 100644 --- a/arch/x86/include/asm/ftrace.h +++ b/arch/x86/include/asm/ftrace.h @@ -35,12 +35,8 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) } #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS -struct ftrace_regs; -#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) -struct __arch_ftrace_regs { - struct pt_regs regs; -}; +#include static __always_inline struct pt_regs * arch_ftrace_get_regs(struct ftrace_regs *fregs) @@ -54,21 +50,6 @@ arch_ftrace_get_regs(struct ftrace_regs *fregs) #define ftrace_regs_set_instruction_pointer(fregs, _ip) \ do { arch_ftrace_regs(fregs)->regs.ip = (_ip); } while (0) -#define ftrace_regs_get_instruction_pointer(fregs) \ - arch_ftrace_regs(fregs)->regs.ip) - -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(&arch_ftrace_regs(fregs)->regs, n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(&arch_ftrace_regs(fregs)->regs, ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(&arch_ftrace_regs(fregs)->regs) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) struct ftrace_ops; #define ftrace_graph_func ftrace_graph_func diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index fc76ce4bf0b7e..7930a3374bb52 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -113,6 +113,8 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val #ifdef CONFIG_FUNCTION_TRACER +#include + extern int ftrace_enabled; /** @@ -150,14 +152,11 @@ struct ftrace_regs { #define ftrace_regs_size() sizeof(struct __arch_ftrace_regs) #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS - -struct __arch_ftrace_regs { - struct pt_regs regs; -}; - -struct ftrace_regs; -#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) - +/* + * Architectures that define HAVE_DYNAMIC_FTRACE_WITH_ARGS must define their own + * arch_ftrace_get_regs() where it only returns pt_regs *if* it is fully + * populated. It should return NULL otherwise. + */ static inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) { return &arch_ftrace_regs(fregs)->regs; @@ -191,23 +190,6 @@ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs) return ftrace_get_regs(fregs) != NULL; } -#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS -#define ftrace_regs_get_instruction_pointer(fregs) \ - instruction_pointer(ftrace_get_regs(fregs)) -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(ftrace_get_regs(fregs), n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(ftrace_get_regs(fregs)) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(ftrace_get_regs(fregs)) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(ftrace_get_regs(fregs), ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(ftrace_get_regs(fregs)) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) -#endif - typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs); diff --git a/include/linux/ftrace_regs.h b/include/linux/ftrace_regs.h new file mode 100644 index 0000000000000..dea6a0851b749 --- /dev/null +++ b/include/linux/ftrace_regs.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_FTRACE_REGS_H +#define _LINUX_FTRACE_REGS_H + +/* + * For archs that just copy pt_regs in ftrace regs, it can use this default. + * If an architecture does not use pt_regs, it must define all the below + * accessor functions. + */ +#ifndef HAVE_ARCH_FTRACE_REGS +struct __arch_ftrace_regs { + struct pt_regs regs; +}; + +#define arch_ftrace_regs(fregs) ((struct __arch_ftrace_regs *)(fregs)) + +struct ftrace_regs; + +#define ftrace_regs_get_instruction_pointer(fregs) \ + instruction_pointer(arch_ftrace_get_regs(fregs)) +#define ftrace_regs_get_argument(fregs, n) \ + regs_get_kernel_argument(arch_ftrace_get_regs(fregs), n) +#define ftrace_regs_get_stack_pointer(fregs) \ + kernel_stack_pointer(arch_ftrace_get_regs(fregs)) +#define ftrace_regs_return_value(fregs) \ + regs_return_value(arch_ftrace_get_regs(fregs)) +#define ftrace_regs_set_return_value(fregs, ret) \ + regs_set_return_value(arch_ftrace_get_regs(fregs), ret) +#define ftrace_override_function_with_return(fregs) \ + override_function_with_return(arch_ftrace_get_regs(fregs)) +#define ftrace_regs_query_register_offset(name) \ + regs_query_register_offset(name) + +#endif /* HAVE_ARCH_FTRACE_REGS */ + +#endif /* _LINUX_FTRACE_REGS_H */ -- 2.51.0