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 X-Spam-Level: X-Spam-Status: No, score=-14.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74372C433E2 for ; Mon, 14 Sep 2020 15:41:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 289ED2074B for ; Mon, 14 Sep 2020 15:41:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600098118; bh=6dOZD00K7JskXGScH+T8GDuPU42d/FZg2Yolmg02oKg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=S4WujIy20AwfLQdkYhEjkNaOJmEshIlA6hha1t8AR/OXzXa6U9vSa5EFFVf2PKVT7 tIYqnb06npSeGpwA+apB+pCClGjbbisMVmpLDdmUoDfRgovllM244NIZliUjlZ91OT 4BSdgdseDdrTuYKeiGpJb9QIVsSynDgK06UFcC1I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726471AbgINPly (ORCPT ); Mon, 14 Sep 2020 11:41:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:49240 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726453AbgINPjs (ORCPT ); Mon, 14 Sep 2020 11:39:48 -0400 Received: from localhost (fw-tnat.cambridge.arm.com [217.140.96.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 49FA320EDD; Mon, 14 Sep 2020 15:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600097987; bh=6dOZD00K7JskXGScH+T8GDuPU42d/FZg2Yolmg02oKg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jv5CR6eESf0fXYhklHn8SltQ70cqk++325NBwiUd6EDioLaXJMZeFovrjazu5BxPl 6FP4cCcNwmd0VKxT3AkAA5qdAwY200/0cPwfsib2KqpFVcH0DxPzr3cdM4u+Aq/fxb Q6RyOtgsjXq7TuseFOqjPl2ot2CPalGDu2j2mFBI= From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Mark Rutland , Vasily Gorbik , Heiko Carstens , Borislav Petkov , Thomas Gleixner , "H . Peter Anvin" , Christian Borntraeger , Ingo Molnar , Jiri Slaby , Miroslav Benes , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown Subject: [PATCH v3 1/3] stacktrace: Remove reliable argument from arch_stack_walk() callback Date: Mon, 14 Sep 2020 16:34:07 +0100 Message-Id: <20200914153409.25097-2-broonie@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200914153409.25097-1-broonie@kernel.org> References: <20200914153409.25097-1-broonie@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the callback passed to arch_stack_walk() has an argument called reliable passed to it to indicate if the stack entry is reliable, a comment says that this is used by some printk() consumers. However in the current kernel none of the arch_stack_walk() implementations ever set this flag to true and the only callback implementation we have is in the generic stacktrace code which ignores the flag. It therefore appears that this flag is redundant so we can simplify and clarify things by removing it. Signed-off-by: Mark Brown Reviewed-by: Miroslav Benes --- arch/s390/kernel/stacktrace.c | 4 ++-- arch/x86/kernel/stacktrace.c | 10 +++++----- include/linux/stacktrace.h | 5 +---- kernel/stacktrace.c | 8 +++----- 4 files changed, 11 insertions(+), 16 deletions(-) diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c index fc5419ac64c8..7f1266c24f6b 100644 --- a/arch/s390/kernel/stacktrace.c +++ b/arch/s390/kernel/stacktrace.c @@ -19,7 +19,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, unwind_for_each_frame(&state, task, regs, 0) { addr = unwind_get_return_address(&state); - if (!addr || !consume_entry(cookie, addr, false)) + if (!addr || !consume_entry(cookie, addr)) break; } } @@ -56,7 +56,7 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, return -EINVAL; #endif - if (!consume_entry(cookie, addr, false)) + if (!consume_entry(cookie, addr)) return -EINVAL; } diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 2fd698e28e4d..8627fda8d993 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -18,13 +18,13 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, struct unwind_state state; unsigned long addr; - if (regs && !consume_entry(cookie, regs->ip, false)) + if (regs && !consume_entry(cookie, regs->ip)) return; for (unwind_start(&state, task, regs, NULL); !unwind_done(&state); unwind_next_frame(&state)) { addr = unwind_get_return_address(&state); - if (!addr || !consume_entry(cookie, addr, false)) + if (!addr || !consume_entry(cookie, addr)) break; } } @@ -72,7 +72,7 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, if (!addr) return -EINVAL; - if (!consume_entry(cookie, addr, false)) + if (!consume_entry(cookie, addr)) return -EINVAL; } @@ -114,7 +114,7 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie, { const void __user *fp = (const void __user *)regs->bp; - if (!consume_entry(cookie, regs->ip, false)) + if (!consume_entry(cookie, regs->ip)) return; while (1) { @@ -128,7 +128,7 @@ void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie, break; if (!frame.ret_addr) break; - if (!consume_entry(cookie, frame.ret_addr, false)) + if (!consume_entry(cookie, frame.ret_addr)) break; fp = frame.next_fp; } diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h index b7af8cc13eda..50e2df30b0aa 100644 --- a/include/linux/stacktrace.h +++ b/include/linux/stacktrace.h @@ -29,14 +29,11 @@ unsigned int stack_trace_save_user(unsigned long *store, unsigned int size); * stack_trace_consume_fn - Callback for arch_stack_walk() * @cookie: Caller supplied pointer handed back by arch_stack_walk() * @addr: The stack entry address to consume - * @reliable: True when the stack entry is reliable. Required by - * some printk based consumers. * * Return: True, if the entry was consumed or skipped * False, if there is no space left to store */ -typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr, - bool reliable); +typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr); /** * arch_stack_walk - Architecture specific function to walk the stack * @consume_entry: Callback which is invoked by the architecture code for diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c index 946f44a9e86a..9f8117c7cfdd 100644 --- a/kernel/stacktrace.c +++ b/kernel/stacktrace.c @@ -78,8 +78,7 @@ struct stacktrace_cookie { unsigned int len; }; -static bool stack_trace_consume_entry(void *cookie, unsigned long addr, - bool reliable) +static bool stack_trace_consume_entry(void *cookie, unsigned long addr) { struct stacktrace_cookie *c = cookie; @@ -94,12 +93,11 @@ static bool stack_trace_consume_entry(void *cookie, unsigned long addr, return c->len < c->size; } -static bool stack_trace_consume_entry_nosched(void *cookie, unsigned long addr, - bool reliable) +static bool stack_trace_consume_entry_nosched(void *cookie, unsigned long addr) { if (in_sched_functions(addr)) return true; - return stack_trace_consume_entry(cookie, addr, reliable); + return stack_trace_consume_entry(cookie, addr); } /** -- 2.20.1