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Date: Sat, 07 Feb 2009 23:15:22 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: linux-kernel@...r.kernel.org
Cc: linux-mtd@...ts.infradead.org
Subject: [PATCH 3/9] module: remove module_text_address()
Impact: Replace and remove risky (non-EXPORTed) API
module_text_address() returns a pointer to the module, which given locking
improvements in module.c, is useless except to test for NULL:
1) If the module can't go away, use __module_text_address.
2) Otherwise, just use is_module_text_address().
Cc: linux-mtd@...ts.infradead.org
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
drivers/mtd/nand/nand_base.c | 4 ++--
include/linux/module.h | 7 -------
kernel/extable.c | 6 +++---
kernel/module.c | 17 ++++-------------
4 files changed, 9 insertions(+), 25 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2720,14 +2720,14 @@ int nand_scan_tail(struct mtd_info *mtd)
return chip->scan_bbt(mtd);
}
-/* module_text_address() isn't exported, and it's mostly a pointless
+/* is_module_text_address() isn't exported, and it's mostly a pointless
test if this is a module _anyway_ -- they'd have to try _really_ hard
to call us from in-kernel code if the core NAND support is modular. */
#ifdef MODULE
#define caller_is_module() (1)
#else
#define caller_is_module() \
- module_text_address((unsigned long)__builtin_return_address(0))
+ is_module_text_address((unsigned long)__builtin_return_address(0))
#endif
/**
diff --git a/include/linux/module.h b/include/linux/module.h
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -358,8 +358,6 @@ static inline int module_is_live(struct
return mod->state != MODULE_STATE_GOING;
}
-/* Is this address in a module? (second is with no locks, for oops) */
-struct module *module_text_address(unsigned long addr);
struct module *__module_text_address(unsigned long addr);
struct module *__module_address(unsigned long addr);
bool is_module_address(unsigned long addr);
@@ -488,11 +486,6 @@ extern int module_get_iter_tracepoints(s
/* Given an address, look for it in the exception tables. */
static inline const struct exception_table_entry *
search_module_extables(unsigned long addr)
-{
- return NULL;
-}
-
-static inline struct module *module_text_address(unsigned long addr)
{
return NULL;
}
diff --git a/kernel/extable.c b/kernel/extable.c
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -58,14 +58,14 @@ __notrace_funcgraph int __kernel_text_ad
{
if (core_kernel_text(addr))
return 1;
- return __module_text_address(addr) != NULL;
+ return is_module_text_address(addr);
}
int kernel_text_address(unsigned long addr)
{
if (core_kernel_text(addr))
return 1;
- return module_text_address(addr) != NULL;
+ return is_module_text_address(addr);
}
/*
@@ -81,5 +81,5 @@ int func_ptr_is_kernel_text(void *ptr)
addr = (unsigned long) dereference_function_descriptor(ptr);
if (core_kernel_text(addr))
return 1;
- return module_text_address(addr) != NULL;
+ return is_module_text_address(addr);
}
diff --git a/kernel/module.c b/kernel/module.c
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -874,8 +874,10 @@ void symbol_put_addr(void *addr)
if (core_kernel_text((unsigned long)addr))
return;
- if (!(modaddr = module_text_address((unsigned long)addr)))
- BUG();
+ /* module_text_address is safe here: we're supposed to have reference
+ * to module from symbol_get, so it can't go away. */
+ modaddr = __module_text_address((unsigned long)addr);
+ BUG_ON(!modaddr);
module_put(modaddr);
}
EXPORT_SYMBOL_GPL(symbol_put_addr);
@@ -2788,17 +2790,6 @@ struct module *__module_text_address(uns
return mod;
}
-struct module *module_text_address(unsigned long addr)
-{
- struct module *mod;
-
- preempt_disable();
- mod = __module_text_address(addr);
- preempt_enable();
-
- return mod;
-}
-
/* Don't grab lock, we're oopsing. */
void print_modules(void)
{
--
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