From patchwork Thu Jun 1 10:12:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13263391 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 8F6F020689; Thu, 1 Jun 2023 10:14:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 95F22C433A8; Thu, 1 Jun 2023 10:14:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685614496; bh=3lUg4pKLSJolxc237x3PHq7j3JRxqHTB75Jbt+sEmbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gdsALwfCviJo1WWIa/dDAGblbrNebHVr1ooSOhVNFz42SZfWVramT65AsKnpfP2Is CT0URD0cm7Fnvp3o9v0pgo39qBTlPCCgfcs/t4hxYdD0hcJM4wGpb+fELbrGOIjGLd Tv3YNe2gP8gwbrv7sTlMLUuKdfLxI9bHWF/BpwOwr1NMBKqXzx0U+X7CwxqpB2kHfd 6JEFo3quF0bBzmfWaSgznKHZYHGbD7YpJVHcKn+/ZdqjRrBe7Fw1eYoYDfogBz73Bf vaoicdjp4SUPDhDj9TM29nKq8q43slzKRIYfcI3DU+tqPZ1milF/m+ZXRmFzBLUmh9 0dlpJGK3F8Y8A== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Mike Rapoport , "Naveen N. Rao" , Palmer Dabbelt , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH 11/13] ftrace: Add swap_func to ftrace_process_locs() Date: Thu, 1 Jun 2023 13:12:55 +0300 Message-Id: <20230601101257.530867-12-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230601101257.530867-1-rppt@kernel.org> References: <20230601101257.530867-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: bpf@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 --- include/linux/ftrace.h | 2 ++ kernel/trace/ftrace.c | 13 ++++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index b23bdd414394..fe443b8ed32c 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -1166,4 +1166,6 @@ 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 764668467155..f5ddc9d4cfb6 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6430,6 +6430,17 @@ static void test_is_sorted(unsigned long *start, unsigned long count) } #endif +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) @@ -6455,7 +6466,7 @@ 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); }