From patchwork Mon Sep 9 06:47:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13795993 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 DDEDE1AED55; Mon, 9 Sep 2024 06:49:11 +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=1725864552; cv=none; b=ExyDWQDejVubaeYfwJPtNMjXAQ5ZxCmLleSRfgH8iYZGAdjFR70rExE4kS0CTvknD/qNlR2dOYMT9bJlVx5lQ/xYrgJSd8Tg2+3UnBz+Me3XyGv5L6p8QY08AzRhw7eZrmTxlK/RjGWF8z9LefKDyTQkKd0cnuoVB8NmouP663U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725864552; c=relaxed/simple; bh=X9sfhUFgPK5V3fglnGNo5sHB9wMPevyPr+qKgRxwoik=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M34AQrNv/+tDhGHiJLQfTO2QZ41+qfQJ6UzADe2ywd4KwUdpqAJUG9czxlfoj8nVGNMJGbUOX4Rdk9jLjwH06w+5zXjDqD+vtkTLkDp6HBWGSiNJ240qwXIJ0Lnwy3qY74B72Ym6ssi63+obVKad19Q753mFgXUHVvIxCerCCJ4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gE5rHksS; 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="gE5rHksS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4244C4CECA; Mon, 9 Sep 2024 06:48:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725864551; bh=X9sfhUFgPK5V3fglnGNo5sHB9wMPevyPr+qKgRxwoik=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gE5rHksSDO3uZ8d+BpxC3iCqxZ+t+kYtAmK8ij3ReKzOLwADAXD1KPV81Gv59cLJB QeffyMC9I/10+jXBXTc3t+0L43Q/5LUUYAuSWRRkqMF1qUTuLgE0CHJfsn1QJzpnCc vpbE4JzC9jBNebxwgUnNlq4/NCkpYAMAlNBdq0T9QBn3F+30lZRo0AKiT/LUxF50CU ovqI5rDJnLv1Xkn6214K1cbtBxdD6gx3ThLFeZUH9qVKkVoE+XrXj8aDCwlWIX7+qy pjaJ4YltFeHWHyE9MeOm4kT8zBk9Qw94w2NQP5QJetbV7d9rtaQpBgupHNkhqraFay cord90B6KD2bQ== From: Mike Rapoport To: Andrew Morton Cc: Andreas Larsson , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Brian Cain , Catalin Marinas , Christoph Hellwig , Christophe Leroy , Dave Hansen , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Kent Overstreet , "Liam R. Howlett" , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Mike Rapoport , Oleg Nesterov , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Russell King , Song Liu , Stafford Horne , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Uladzislau Rezki , Vineet Gupta , Will Deacon , bpf@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v3 5/8] ftrace: Add swap_func to ftrace_process_locs() Date: Mon, 9 Sep 2024 09:47:27 +0300 Message-ID: <20240909064730.3290724-6-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240909064730.3290724-1-rppt@kernel.org> References: <20240909064730.3290724-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Song Liu ftrace_process_locs sorts module mcount, which is inside RO memory. Add a ftrace_swap_func so that archs can use RO-memory-poke function to do the sorting. Signed-off-by: Song Liu Signed-off-by: Mike Rapoport (Microsoft) --- include/linux/ftrace.h | 2 ++ kernel/trace/ftrace.c | 19 ++++++++++++++++++- 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index fd5e84d0ec47..b794dcb7cae8 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -1188,4 +1188,6 @@ unsigned long arch_syscall_addr(int nr); #endif /* CONFIG_FTRACE_SYSCALLS */ +void ftrace_swap_func(void *a, void *b, int n); + #endif /* _LINUX_FTRACE_H */ diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 4c28dd177ca6..95bb9b52ab36 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6989,6 +6989,23 @@ static void test_is_sorted(unsigned long *start, unsigned long count) } #endif +/* + * ftrace_process_locs sorts module mcount, which might be inside RO + * memory. + * ftrace_swap_func allows architectures to use RO-memory-poke function to + * do the sorting. + */ +void __weak ftrace_swap_func(void *a, void *b, int n) +{ + unsigned long t; + + WARN_ON_ONCE(n != sizeof(t)); + + t = *((unsigned long *)a); + *(unsigned long *)a = *(unsigned long *)b; + *(unsigned long *)b = t; +} + static int ftrace_process_locs(struct module *mod, unsigned long *start, unsigned long *end) @@ -7016,7 +7033,7 @@ static int ftrace_process_locs(struct module *mod, */ if (!IS_ENABLED(CONFIG_BUILDTIME_MCOUNT_SORT) || mod) { sort(start, count, sizeof(*start), - ftrace_cmp_ips, NULL); + ftrace_cmp_ips, ftrace_swap_func); } else { test_is_sorted(start, count); }