linux-kernel - [PATCH 1/7] modules: Refactor within_module_core() and within_module

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Date:   Mon, 24 Jan 2022 09:22:15 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Luis Chamberlain <mcgrof@...nel.org>, Jessica Yu <jeyu@...nel.org>
CC:     Christophe Leroy <christophe.leroy@...roup.eu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "kgdb-bugreport@...ts.sourceforge.net" 
        <kgdb-bugreport@...ts.sourceforge.net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: [PATCH 1/7] modules: Refactor within_module_core() and
 within_module_init()

within_module_core() and within_module_init() are doing the exact same
test, one on core_layout, the second on init_layout.

In preparation of increasing the complexity of that verification,
refactor it into a single function called within_module_layout().

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 include/linux/module.h | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index c9f1200b2312..33b4db8f5ca5 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -565,18 +565,27 @@ bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 bool is_module_percpu_address(unsigned long addr);
 bool is_module_text_address(unsigned long addr);
 
+static inline bool within_range(unsigned long addr, void *base, unsigned int size)
+{
+	return addr >= (unsigned long)base && addr < (unsigned long)base + size;
+}
+
+static inline bool within_module_layout(unsigned long addr,
+					const struct module_layout *layout)
+{
+	return within_range(addr, layout->base, layout->size);
+}
+
 static inline bool within_module_core(unsigned long addr,
 				      const struct module *mod)
 {
-	return (unsigned long)mod->core_layout.base <= addr &&
-	       addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
+	return within_module_layout(addr, &mod->core_layout);
 }
 
 static inline bool within_module_init(unsigned long addr,
 				      const struct module *mod)
 {
-	return (unsigned long)mod->init_layout.base <= addr &&
-	       addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
+	return within_module_layout(addr, &mod->init_layout);
 }
 
 static inline bool within_module(unsigned long addr, const struct module *mod)
-- 
2.33.1