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Remove "unsafe" from module struct

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Adrian Bunk points out that "unsafe" was used to mark modules touched by
the deprecated MOD_INC_USE_COUNT interface, which has long gone.  It's time
to remove the member from the module structure, as well.

If you want a module which can't unload, don't register an exit function.

(Vlad Yasevich says SCTP is now safe to unload, so just remove the
__unsafe there).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Cc: Sridhar Samudrala <sri@us.ibm.com>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell 2007-10-16 23:26:27 -07:00 committed by Linus Torvalds
parent d9c9bef134
commit af49d9248f
4 changed files with 9 additions and 37 deletions
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9
drivers/dma/iop-adma.c
View File

@ -1446,21 +1446,20 @@ static struct platform_driver iop_adma_driver = {
static int __init iop_adma_init (void)
{
/* it's currently unsafe to unload this module */
/* if forced, worst case is that rmmod hangs */
__unsafe(THIS_MODULE);
return platform_driver_register(&iop_adma_driver);
}
/* it's currently unsafe to unload this module */
#if 0
static void __exit iop_adma_exit (void)
{
platform_driver_unregister(&iop_adma_driver);
return;
}
module_exit(iop_adma_exit);
#endif
module_init(iop_adma_init);
module_exit(iop_adma_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("IOP ADMA Engine Driver");

15
include/linux/module.h
View File

@ -312,9 +312,6 @@ struct module
/* Arch-specific module values */
struct mod_arch_specific arch;
/* Am I unsafe to unload? */
int unsafe;
unsigned int taints; /* same bits as kernel:tainted */
#ifdef CONFIG_GENERIC_BUG
@ -441,16 +438,6 @@ static inline void __module_get(struct module *module)
__mod ? __mod->name : "kernel"; \
})
#define __unsafe(mod) \
do { \
if (mod && !(mod)->unsafe) { \
printk(KERN_WARNING \
"Module %s cannot be unloaded due to unsafe usage in" \
" %s:%u\n", (mod)->name, __FILE__, __LINE__); \
(mod)->unsafe = 1; \
} \
} while(0)
/* For kallsyms to ask for address resolution. NULL means not found. */
const char *module_address_lookup(unsigned long addr,
unsigned long *symbolsize,
@ -518,8 +505,6 @@ static inline void module_put(struct module *module)
#define module_name(mod) "kernel"
#define __unsafe(mod)
/* For kallsyms to ask for address resolution. NULL means not found. */
static inline const char *module_address_lookup(unsigned long addr,
unsigned long *symbolsize,

21
kernel/module.c
View File

@ -692,8 +692,7 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
}
/* If it has an init func, it must have an exit func to unload */
if ((mod->init != NULL && mod->exit == NULL)
|| mod->unsafe) {
if (mod->init && !mod->exit) {
forced = try_force_unload(flags);
if (!forced) {
/* This module can't be removed */
@ -741,11 +740,6 @@ static void print_unload_info(struct seq_file *m, struct module *mod)
seq_printf(m, "%s,", use->module_which_uses->name);
}
if (mod->unsafe) {
printed_something = 1;
seq_printf(m, "[unsafe],");
}
if (mod->init != NULL && mod->exit == NULL) {
printed_something = 1;
seq_printf(m, "[permanent],");
@ -2011,15 +2005,10 @@ sys_init_module(void __user *umod,
buggy refcounters. */
mod->state = MODULE_STATE_GOING;
synchronize_sched();
if (mod->unsafe)
printk(KERN_ERR "%s: module is now stuck!\n",
mod->name);
else {
module_put(mod);
mutex_lock(&module_mutex);
free_module(mod);
mutex_unlock(&module_mutex);
}
module_put(mod);
mutex_lock(&module_mutex);
free_module(mod);
mutex_unlock(&module_mutex);
return ret;
}

1
net/sctp/protocol.c
View File

@ -1228,7 +1228,6 @@ SCTP_STATIC __init int sctp_init(void)
if (status)
goto err_v6_add_protocol;
__unsafe(THIS_MODULE);
status = 0;
out:
return status;