From mboxrd@z Thu Jan 1 00:00:00 1970 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 54E2AC433EF for ; Sat, 28 May 2022 02:53:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355714AbiE1Cx4 (ORCPT ); Fri, 27 May 2022 22:53:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355608AbiE1Cw6 (ORCPT ); Fri, 27 May 2022 22:52:58 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26E4C880C6 for ; Fri, 27 May 2022 19:52:55 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8D3F6B82690 for ; Sat, 28 May 2022 02:52:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49397C385A9; Sat, 28 May 2022 02:52:52 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.95) (envelope-from ) id 1numZP-000LRh-CI; Fri, 27 May 2022 22:52:51 -0400 Message-ID: <20220528025251.216039824@goodmis.org> User-Agent: quilt/0.66 Date: Fri, 27 May 2022 22:50:42 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Li kunyu Subject: [for-next][PATCH 14/23] ftrace: Remove return value of ftrace_arch_modify_*() References: <20220528025028.850906216@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Li kunyu All instances of the function ftrace_arch_modify_prepare() and ftrace_arch_modify_post_process() return zero. There's no point in checking their return value. Just have them be void functions. Link: https://lkml.kernel.org/r/20220518023639.4065-1-kunyu@nfschina.com Signed-off-by: Li kunyu Signed-off-by: Steven Rostedt (Google) --- arch/arm/kernel/ftrace.c | 6 ++---- arch/riscv/kernel/ftrace.c | 6 ++---- arch/s390/kernel/ftrace.c | 3 +-- arch/x86/kernel/ftrace.c | 6 ++---- include/linux/ftrace.h | 4 ++-- kernel/trace/ftrace.c | 16 ++++------------ 6 files changed, 13 insertions(+), 28 deletions(-) diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c index 83cc068586bc..a0b6d1e3812f 100644 --- a/arch/arm/kernel/ftrace.c +++ b/arch/arm/kernel/ftrace.c @@ -79,16 +79,14 @@ static unsigned long __ref adjust_address(struct dyn_ftrace *rec, return (unsigned long)&ftrace_regs_caller_from_init; } -int ftrace_arch_code_modify_prepare(void) +void ftrace_arch_code_modify_prepare(void) { - return 0; } -int ftrace_arch_code_modify_post_process(void) +void ftrace_arch_code_modify_post_process(void) { /* Make sure any TLB misses during machine stop are cleared. */ flush_tlb_all(); - return 0; } static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr, diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c index 4716f4cdc038..2086f6585773 100644 --- a/arch/riscv/kernel/ftrace.c +++ b/arch/riscv/kernel/ftrace.c @@ -12,16 +12,14 @@ #include #ifdef CONFIG_DYNAMIC_FTRACE -int ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex) +void ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex) { mutex_lock(&text_mutex); - return 0; } -int ftrace_arch_code_modify_post_process(void) __releases(&text_mutex) +void ftrace_arch_code_modify_post_process(void) __releases(&text_mutex) { mutex_unlock(&text_mutex); - return 0; } static int ftrace_check_current_call(unsigned long hook_pos, diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c index 1852d46babb1..416b5a94353d 100644 --- a/arch/s390/kernel/ftrace.c +++ b/arch/s390/kernel/ftrace.c @@ -225,14 +225,13 @@ void arch_ftrace_update_code(int command) ftrace_modify_all_code(command); } -int ftrace_arch_code_modify_post_process(void) +void ftrace_arch_code_modify_post_process(void) { /* * Flush any pre-fetched instructions on all * CPUs to make the new code visible. */ text_poke_sync_lock(); - return 0; } #ifdef CONFIG_MODULES diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 1e31c7d21597..73d2719ed12c 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -37,7 +37,7 @@ static int ftrace_poke_late = 0; -int ftrace_arch_code_modify_prepare(void) +void ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex) { /* @@ -47,10 +47,9 @@ int ftrace_arch_code_modify_prepare(void) */ mutex_lock(&text_mutex); ftrace_poke_late = 1; - return 0; } -int ftrace_arch_code_modify_post_process(void) +void ftrace_arch_code_modify_post_process(void) __releases(&text_mutex) { /* @@ -61,7 +60,6 @@ int ftrace_arch_code_modify_post_process(void) text_poke_finish(); ftrace_poke_late = 0; mutex_unlock(&text_mutex); - return 0; } static const char *ftrace_nop_replace(void) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 4816b7e11047..a5f74f6e7e4e 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -449,8 +449,8 @@ static inline void stack_tracer_enable(void) { } #ifdef CONFIG_DYNAMIC_FTRACE -int ftrace_arch_code_modify_prepare(void); -int ftrace_arch_code_modify_post_process(void); +void ftrace_arch_code_modify_prepare(void); +void ftrace_arch_code_modify_post_process(void); enum ftrace_bug_type { FTRACE_BUG_UNKNOWN, diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 737e895e2aad..852c731cbd9a 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2704,18 +2704,16 @@ ftrace_nop_initialize(struct module *mod, struct dyn_ftrace *rec) * archs can override this function if they must do something * before the modifying code is performed. */ -int __weak ftrace_arch_code_modify_prepare(void) +void __weak ftrace_arch_code_modify_prepare(void) { - return 0; } /* * archs can override this function if they must do something * after the modifying code is performed. */ -int __weak ftrace_arch_code_modify_post_process(void) +void __weak ftrace_arch_code_modify_post_process(void) { - return 0; } void ftrace_modify_all_code(int command) @@ -2801,12 +2799,7 @@ void __weak arch_ftrace_update_code(int command) static void ftrace_run_update_code(int command) { - int ret; - - ret = ftrace_arch_code_modify_prepare(); - FTRACE_WARN_ON(ret); - if (ret) - return; + ftrace_arch_code_modify_prepare(); /* * By default we use stop_machine() to modify the code. @@ -2816,8 +2809,7 @@ static void ftrace_run_update_code(int command) */ arch_ftrace_update_code(command); - ret = ftrace_arch_code_modify_post_process(); - FTRACE_WARN_ON(ret); + ftrace_arch_code_modify_post_process(); } static void ftrace_run_modify_code(struct ftrace_ops *ops, int command, -- 2.35.1