From patchwork Sat Feb 15 03:43:06 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 13975931 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 846831624F5; Sat, 15 Feb 2025 03:43:51 +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=1739591031; cv=none; b=ngyG8kH0F1UFVdtruqKmcw5RQejnIGOpKGvURvUh2UvAywXVpwOo6QOSnQeJsvwxVCXqxQmzdCF++j20p3YMLfhyyRv9ELfUrOoMngvnS5Y2lyDVmZcCiSp7/H6s3onjJuPhQTxlB6LBv0ifabZi5BuOnYJwsfd13x0ETmgqaTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739591031; c=relaxed/simple; bh=uJnQyG8i5lyHH/RkjjPSKWtqaqlnhy1DWyeFiqlXDKo=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=CS2yzl78yybG55E51o9x3SQ0QJrJkRM+oR2MOf593BSGiebiBGxmmGDCD6YIrstNKGc692B39Nv0Sn3pmmkCmHDDEXvHgNXOcz5sw6sKsf1BQp9dbDGWOHXzA3O3sjrqm6pNPo24NdUDc+Jk8g8s8QK5XKlvYaIdP6tmqHlYC0o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E72AC4CEE6; Sat, 15 Feb 2025 03:43:51 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.98) (envelope-from ) id 1tj965-00000002gwJ-0Dzx; Fri, 14 Feb 2025 22:44:05 -0500 Message-ID: <20250215034404.902259250@goodmis.org> User-Agent: quilt/0.68 Date: Fri, 14 Feb 2025 22:43:06 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Luis Chamberlain , Petr Pavlu , Sami Tolvanen , Daniel Gomez , linux-modules@vger.kernel.org Subject: [PATCH v2 5/8] module: Add module_for_each_mod() function References: <20250215034301.624019422@goodmis.org> Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Steven Rostedt The tracing system needs a way to save all the currently loaded modules and their addresses into persistent memory so that it can evaluate the addresses on a reboot from a crash. When the persistent memory trace starts, it will load the module addresses and names into the persistent memory. To do so, it will call the module_for_each_mod() function and pass it a function and data structure to get called on each loaded module. Then it can record the memory. This only implements that function. Cc: Luis Chamberlain Cc: Petr Pavlu Cc: Sami Tolvanen Cc: Daniel Gomez Cc: linux-modules@vger.kernel.org Signed-off-by: Steven Rostedt (Google) --- include/linux/module.h | 6 ++++++ kernel/module/main.c | 14 ++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/module.h b/include/linux/module.h index 30e5b19bafa9..9a71dd2cb11f 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -782,6 +782,8 @@ static inline void *module_writable_address(struct module *mod, void *loc) return __module_writable_address(mod, loc); } +void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data); + #else /* !CONFIG_MODULES... */ static inline struct module *__module_address(unsigned long addr) @@ -894,6 +896,10 @@ static inline void *module_writable_address(struct module *mod, void *loc) { return loc; } + +static inline void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data) +{ +} #endif /* CONFIG_MODULES */ #ifdef CONFIG_SYSFS diff --git a/kernel/module/main.c b/kernel/module/main.c index 1fb9ad289a6f..ea1fe313fb89 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3809,6 +3809,20 @@ bool is_module_text_address(unsigned long addr) return ret; } +void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data) +{ + struct module *mod; + + preempt_disable(); + list_for_each_entry_rcu(mod, &modules, list) { + if (mod->state == MODULE_STATE_UNFORMED) + continue; + if (func(mod, data)) + break; + } + preempt_enable(); +} + /** * __module_text_address() - get the module whose code contains an address. * @addr: the address.