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Thu, 27 Jan 2022 11:27:57 +0000 From: Christophe Leroy To: Luis Chamberlain , Jessica Yu Subject: [PATCH v2 1/5] modules: Always have struct mod_tree_root Thread-Topic: [PATCH v2 1/5] modules: Always have struct mod_tree_root Thread-Index: AQHYE3Dv9+i+4LBYlku5GPEgOH7pTg== Date: Thu, 27 Jan 2022 11:27:57 +0000 Message-ID: <51394dd54e861e723645940a191f7d54dcd2abbb.1643282353.git.christophe.leroy@csgroup.eu> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=csgroup.eu; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d088cbc0-7156-40db-0676-08d9e18811af x-ms-traffictypediagnostic: MRZP264MB3227:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:5236; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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This also means that struct mod_tree_root is required even without MODULES_TREE_LOOKUP. Also remove module_addr_min and module_addr_max as there will be one min and one max for each tree. Signed-off-by: Christophe Leroy --- kernel/module.c | 39 ++++++++++++++++++--------------------- 1 file changed, 18 insertions(+), 21 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index 24dab046e16c..c0f9d63d3f05 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -85,7 +85,7 @@ * Mutex protects: * 1) List of modules (also safely readable with preempt_disable), * 2) module_use links, - * 3) module_addr_min/module_addr_max. + * 3) mod_tree.addr_min/mod_tree.addr_max. * (delete and add uses RCU list operations). */ static DEFINE_MUTEX(module_mutex); @@ -96,6 +96,16 @@ static void do_free_init(struct work_struct *w); static DECLARE_WORK(init_free_wq, do_free_init); static LLIST_HEAD(init_free_list); +static struct mod_tree_root { +#ifdef CONFIG_MODULES_TREE_LOOKUP + struct latch_tree_root root; +#endif + unsigned long addr_min; + unsigned long addr_max; +} mod_tree __cacheline_aligned = { + .addr_min = -1UL, +}; + #ifdef CONFIG_MODULES_TREE_LOOKUP /* @@ -149,17 +159,6 @@ static const struct latch_tree_ops mod_tree_ops = { .comp = mod_tree_comp, }; -static struct mod_tree_root { - struct latch_tree_root root; - unsigned long addr_min; - unsigned long addr_max; -} mod_tree __cacheline_aligned = { - .addr_min = -1UL, -}; - -#define module_addr_min mod_tree.addr_min -#define module_addr_max mod_tree.addr_max - static noinline void __mod_tree_insert(struct mod_tree_node *node) { latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); @@ -209,8 +208,6 @@ static struct module *mod_find(unsigned long addr) #else /* MODULES_TREE_LOOKUP */ -static unsigned long module_addr_min = -1UL, module_addr_max = 0; - static void mod_tree_insert(struct module *mod) { } static void mod_tree_remove_init(struct module *mod) { } static void mod_tree_remove(struct module *mod) { } @@ -239,10 +236,10 @@ static void __mod_update_bounds(void *base, unsigned int size) unsigned long min = (unsigned long)base; unsigned long max = min + size; - if (min < module_addr_min) - module_addr_min = min; - if (max > module_addr_max) - module_addr_max = max; + if (min < mod_tree.addr_min) + mod_tree.addr_min = min; + if (max > mod_tree.addr_max) + mod_tree.addr_max = max; } static void mod_update_bounds(struct module *mod) @@ -4546,14 +4543,14 @@ static void cfi_init(struct module *mod) mod->exit = *exit; #endif - cfi_module_add(mod, module_addr_min); + cfi_module_add(mod, mod_tree.addr_min); #endif } static void cfi_cleanup(struct module *mod) { #ifdef CONFIG_CFI_CLANG - cfi_module_remove(mod, module_addr_min); + cfi_module_remove(mod, mod_tree.addr_min); #endif } @@ -4737,7 +4734,7 @@ struct module *__module_address(unsigned long addr) { struct module *mod; - if (addr < module_addr_min || addr > module_addr_max) + if (addr < mod_tree.addr_min || addr > mod_tree.addr_max) return NULL; module_assert_mutex_or_preempt();