[PATCH] In-kernel Module Loader

This is an implementation of the in-kernel module loader extending
the try_inc_mod_count() primitive and making its use compulsory.
This has the benifit of simplicity, and similarity to the existing
scheme.  To reduce the cost of the constant increments and
decrements, reference counters are lockless and per-cpu.

Eliminated (coming in following patches):
 o Modversions
 o Module parameters
 o kallsyms
 o EXPORT_SYMBOL_GPL and MODULE_LICENCE checks
 o DEVICE_TABLE support.

New features:
 o Typesafe symbol_get/symbol_put
 o Single "insert this module" syscall interface allows trivial userspace.
 o Raceless loading and unloading

You will need the trivial replacement module utilities from:
	http://ozlabs.org/~rusty/module-init-tools-0.6.tar.gz

Makefile

@@ -157,7 +157,6 @@ OBJCOPY		= $(CROSS_COMPILE)objcopy
 OBJDUMP		= $(CROSS_COMPILE)objdump
 AWK		= awk
 GENKSYMS	= /sbin/genksyms
-DEPMOD		= /sbin/depmod
 KALLSYMS	= /sbin/kallsyms
 PERL		= perl
 MODFLAGS	= -DMODULE
@@ -516,7 +515,7 @@ modules: $(SUBDIRS)
 #	Install modules
 
 .PHONY: modules_install
-modules_install: _modinst_ $(patsubst %, _modinst_%, $(SUBDIRS)) _modinst_post
+modules_install: _modinst_ $(patsubst %, _modinst_%, $(SUBDIRS))
 
 .PHONY: _modinst_
 _modinst_:
@@ -525,20 +524,6 @@ _modinst_:
 	@mkdir -p $(MODLIB)/kernel
 	@ln -s $(TOPDIR) $(MODLIB)/build
 
-# If System.map exists, run depmod.  This deliberately does not have a
-# dependency on System.map since that would run the dependency tree on
-# vmlinux.  This depmod is only for convenience to give the initial
-# boot a modules.dep even before / is mounted read-write.  However the
-# boot script depmod is the master version.
-ifeq "$(strip $(INSTALL_MOD_PATH))" ""
-depmod_opts	:=
-else
-depmod_opts	:= -b $(INSTALL_MOD_PATH) -r
-endif
-.PHONY: _modinst_post
-_modinst_post:
-	if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
-
 .PHONY: $(patsubst %, _modinst_%, $(SUBDIRS))
 $(patsubst %, _modinst_%, $(SUBDIRS)) :
 	$(Q)$(MAKE) -f scripts/Makefile.modinst obj=$(patsubst _modinst_%,%,$@)

arch/i386/Kconfig

@@ -1604,13 +1604,14 @@ config DEBUG_HIGHMEM
 	  This options enables addition error checking for high memory systems.
 	  Disable for production systems.
 
-config KALLSYMS
-	bool "Load all symbols for debugging/kksymoops"
-	depends on DEBUG_KERNEL
-	help
-	  Say Y here to let the kernel print out symbolic crash information and
-	  symbolic stack backtraces. This increases the size of the kernel
-	  somewhat, as all symbols have to be loaded into the kernel image.
+# Reimplemented RSN.
+#config KALLSYMS
+#	bool "Load all symbols for debugging/kksymoops"
+#	depends on DEBUG_KERNEL
+#	help
+#	  Say Y here to let the kernel print out symbolic crash information and
+#	  symbolic stack backtraces. This increases the size of the kernel
+#	  somewhat, as all symbols have to be loaded into the kernel image.
 
 config X86_EXTRA_IRQS
 	bool

arch/ia64/Kconfig

@@ -813,13 +813,13 @@ config DEBUG_KERNEL
 	  Say Y here if you are developing drivers or trying to debug and
 	  identify kernel problems.
 
-config KALLSYMS
-	bool "Load all symbols for debugging/kksymoops"
-	depends on DEBUG_KERNEL
-	help
-	  Say Y here to let the kernel print out symbolic crash information and
-	  symbolic stack backtraces. This increases the size of the kernel
-	  somewhat, as all symbols have to be loaded into the kernel image.
+#  config KALLSYMS
+#  	bool "Load all symbols for debugging/kksymoops"
+#  	depends on DEBUG_KERNEL
+#  	help
+#  	  Say Y here to let the kernel print out symbolic crash information and
+#  	  symbolic stack backtraces. This increases the size of the kernel
+#  	  somewhat, as all symbols have to be loaded into the kernel image.
 
 config IA64_PRINT_HAZARDS
 	bool "Print possible IA-64 dependency violations to console"

arch/ppc/Kconfig

@@ -1807,9 +1807,9 @@ config DEBUG_HIGHMEM
 	bool "Highmem debugging"
 	depends on DEBUG_KERNEL && HIGHMEM
 
-config KALLSYMS
-	bool "Load all symbols for debugging/kksymoops"
-	depends on DEBUG_KERNEL
+#  config KALLSYMS
+#  	bool "Load all symbols for debugging/kksymoops"
+#  	depends on DEBUG_KERNEL
 
 config KGDB
 	bool "Include kgdb kernel debugger"

arch/x86_64/Kconfig

@@ -739,13 +739,13 @@ config INIT_DEBUG
 	help
 	  Fill __init and __initdata at the end of boot. This is only for debugging.
 
-config KALLSYMS
-	bool "Load all symbols for debugging/kksymoops"
-	depends on DEBUG_KERNEL
-	help
-	  Say Y here to let the kernel print out symbolic crash information and
-	  symbolic stack backtraces. This increases the size of the kernel
-	  somewhat, as all symbols have to be loaded into the kernel image.
+#  config KALLSYMS
+#  	bool "Load all symbols for debugging/kksymoops"
+#  	depends on DEBUG_KERNEL
+#  	help
+#  	  Say Y here to let the kernel print out symbolic crash information and
+#  	  symbolic stack backtraces. This increases the size of the kernel
+#  	  somewhat, as all symbols have to be loaded into the kernel image.
 
 endmenu
 

drivers/block/floppy.c

@@ -151,6 +151,7 @@ static int print_unex=1;
 #include <linux/kernel.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
+#include <linux/version.h>
 #define FDPATCHES
 #include <linux/fdreg.h>
 

drivers/char/ftape/compressor/zftape-compress.c

@@ -1266,13 +1266,6 @@ MODULE_DESCRIPTION(
 "Compression routines for zftape. Uses the lzrw3 algorithm by Ross Williams");
 MODULE_LICENSE("GPL");
 
-#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,18)
-static int can_unload(void)
-{
-	return keep_module_locked ? -EBUSY : 0;
-}
-#endif
-
 /* Called by modules package when installing the driver
  */
 int init_module(void)
@@ -1282,9 +1275,11 @@ int init_module(void)
 #if LINUX_VERSION_CODE < KERNEL_VER(2,1,18)
 	register_symtab(0); /* remove global ftape symbols */
 #else
+#if 0 /* FIXME --RR */
 	if (!mod_member_present(&__this_module, can_unload))
 		return -EBUSY;
 	__this_module.can_unload = can_unload;
+#endif
 #endif
 	result = zft_compressor_init();
 	keep_module_locked = 0;

fs/filesystems.c

@@ -31,14 +31,22 @@ static rwlock_t file_systems_lock = RW_LOCK_UNLOCKED;
 /* WARNING: This can be used only if we _already_ own a reference */
 void get_filesystem(struct file_system_type *fs)
 {
-	if (fs->owner)
-		__MOD_INC_USE_COUNT(fs->owner);
+	if (!try_module_get(fs->owner)) {
+#ifdef CONFIG_MODULE_UNLOAD
+		unsigned int cpu = get_cpu();
+		local_inc(&fs->owner->ref[cpu].count);
+		put_cpu();
+#else
+		/* Getting filesystem while it's starting up?  We're
+                   already supposed to have a reference. */
+		BUG();
+#endif
+	}
 }
 
 void put_filesystem(struct file_system_type *fs)
 {
-	if (fs->owner)
-		__MOD_DEC_USE_COUNT(fs->owner);
+	module_put(fs->owner);
 }
 
 static struct file_system_type **find_filesystem(const char *name)

fs/proc/proc_misc.c

@@ -296,17 +296,6 @@ static struct file_operations proc_modules_operations = {
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };
-extern struct seq_operations ksyms_op;
-static int ksyms_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &ksyms_op);
-}
-static struct file_operations proc_ksyms_operations = {
-	.open		= ksyms_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
 #endif
 
 extern struct seq_operations slabinfo_op;
@@ -604,7 +593,6 @@ void __init proc_misc_init(void)
 	create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 #ifdef CONFIG_MODULES
 	create_seq_entry("modules", 0, &proc_modules_operations);
-	create_seq_entry("ksyms", 0, &proc_ksyms_operations);
 #endif
 	proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 	if (proc_root_kcore) {

include/linux/cpu.h

@@ -21,6 +21,7 @@
 
 #include <linux/device.h>
 #include <linux/node.h>
+#include <asm/semaphore.h>
 
 struct cpu {
 	int node_id;		/* The node which contains the CPU */
@@ -29,4 +30,6 @@ struct cpu {
 
 extern int register_cpu(struct cpu *, int, struct node *);
 
+/* Stop CPUs going up and down. */
+extern struct semaphore cpucontrol;
 #endif /* _LINUX_CPU_H_ */

include/linux/elf.h

@@ -198,6 +198,9 @@ typedef struct {
 #define ELF32_R_SYM(x) ((x) >> 8)
 #define ELF32_R_TYPE(x) ((x) & 0xff)
 
+#define ELF64_R_SYM(i)			((i) >> 32)
+#define ELF64_R_TYPE(i)			((i) & 0xffffffff)
+
 #define R_386_NONE	0
 #define R_386_32	1
 #define R_386_PC32	2
@@ -295,6 +298,7 @@ typedef struct {
 #define R_SPARC_PCPLT10		29
 #define R_SPARC_10		30
 #define R_SPARC_11		31
+#define R_SPARC_64		32
 #define R_SPARC_WDISP16		40
 #define R_SPARC_WDISP19		41
 #define R_SPARC_7		43
@@ -369,6 +373,47 @@ typedef struct {
 #define R_ALPHA_JMP_SLOT        26      /* Create PLT entry */
 #define R_ALPHA_RELATIVE        27      /* Adjust by program base */
 
+/* PowerPC relocations defined by the ABIs */
+#define R_PPC_NONE		0
+#define R_PPC_ADDR32		1	/* 32bit absolute address */
+#define R_PPC_ADDR24		2	/* 26bit address, 2 bits ignored.  */
+#define R_PPC_ADDR16		3	/* 16bit absolute address */
+#define R_PPC_ADDR16_LO		4	/* lower 16bit of absolute address */
+#define R_PPC_ADDR16_HI		5	/* high 16bit of absolute address */
+#define R_PPC_ADDR16_HA		6	/* adjusted high 16bit */
+#define R_PPC_ADDR14		7	/* 16bit address, 2 bits ignored */
+#define R_PPC_ADDR14_BRTAKEN	8
+#define R_PPC_ADDR14_BRNTAKEN	9
+#define R_PPC_REL24		10	/* PC relative 26 bit */
+#define R_PPC_REL14		11	/* PC relative 16 bit */
+#define R_PPC_REL14_BRTAKEN	12
+#define R_PPC_REL14_BRNTAKEN	13
+#define R_PPC_GOT16		14
+#define R_PPC_GOT16_LO		15
+#define R_PPC_GOT16_HI		16
+#define R_PPC_GOT16_HA		17
+#define R_PPC_PLTREL24		18
+#define R_PPC_COPY		19
+#define R_PPC_GLOB_DAT		20
+#define R_PPC_JMP_SLOT		21
+#define R_PPC_RELATIVE		22
+#define R_PPC_LOCAL24PC		23
+#define R_PPC_UADDR32		24
+#define R_PPC_UADDR16		25
+#define R_PPC_REL32		26
+#define R_PPC_PLT32		27
+#define R_PPC_PLTREL32		28
+#define R_PPC_PLT16_LO		29
+#define R_PPC_PLT16_HI		30
+#define R_PPC_PLT16_HA		31
+#define R_PPC_SDAREL16		32
+#define R_PPC_SECTOFF		33
+#define R_PPC_SECTOFF_LO	34
+#define R_PPC_SECTOFF_HI	35
+#define R_PPC_SECTOFF_HA	36
+/* Keep this the last entry.  */
+#define R_PPC_NUM		37
+
 /* Legal values for e_flags field of Elf64_Ehdr.  */
 
 #define EF_ALPHA_32BIT		1	/* All addresses are below 2GB */

include/linux/init.h

@@ -38,17 +38,30 @@
  * Also note, that this data cannot be "const".
  */
 
-#ifndef MODULE
+/* These are for everybody (although not all archs will actually
+   discard it in modules) */
+#define __init		__attribute__ ((__section__ (".init.text")))
+#define __initdata	__attribute__ ((__section__ (".init.data")))
+#define __exit		__attribute__ ((__section__(".exit.text")))
+#define __exitdata	__attribute__ ((__section__(".exit.data")))
+#define __exit_call	__attribute__ ((unused,__section__ (".exitcall.exit")))
 
-#ifndef __ASSEMBLY__
+/* For assembly routines */
+#define __INIT		.section	".init.text","ax"
+#define __FINIT		.previous
+#define __INITDATA	.section	".init.data","aw"
 
+#ifndef __ASSEMBLY__
 /*
  * Used for initialization calls..
  */
 typedef int (*initcall_t)(void);
 typedef void (*exitcall_t)(void);
+#endif
 
-extern initcall_t __initcall_start, __initcall_end;
+#ifndef MODULE
+
+#ifndef __ASSEMBLY__
 
 /* initcalls are now grouped by functionality into separate 
  * subsections. Ordering inside the subsections is determined
@@ -70,7 +83,7 @@ extern initcall_t __initcall_start, __initcall_end;
 
 #define __initcall(fn) device_initcall(fn)
 
-#define __exitcall(fn)								\
+#define __exitcall(fn)							\
 	static exitcall_t __exitcall_##fn __exit_call = fn
 
 /*
@@ -83,39 +96,21 @@ struct kernel_param {
 
 extern struct kernel_param __setup_start, __setup_end;
 
-#define __setup(str, fn)								\
-	static char __setup_str_##fn[] __initdata = str;				\
-	static struct kernel_param __setup_##fn __attribute__((unused)) __initsetup = { __setup_str_##fn, fn }
+#define __setup(str, fn)						\
+	static char __setup_str_##fn[] __initdata = str;		\
+	static struct kernel_param __setup_##fn				\
+		 __attribute__((unused,__section__ (".init.setup")))	\
+		= { __setup_str_##fn, fn }
 
 #endif /* __ASSEMBLY__ */
 
-/*
- * Mark functions and data as being only used at initialization
- * or exit time.
- */
-#define __init		__attribute__ ((__section__ (".init.text")))
-#define __exit		__attribute__ ((unused, __section__(".exit.text")))
-#define __initdata	__attribute__ ((__section__ (".init.data")))
-#define __exitdata	__attribute__ ((unused, __section__ (".exit.data")))
-#define __initsetup	__attribute__ ((unused,__section__ (".init.setup")))
-#define __init_call(level)  __attribute__ ((unused,__section__ (".initcall" level ".init")))
-#define __exit_call	__attribute__ ((unused,__section__ (".exitcall.exit")))
-
-/* For assembly routines */
-#define __INIT		.section	".init.text","ax"
-#define __FINIT		.previous
-#define __INITDATA	.section	".init.data","aw"
-
 /**
  * module_init() - driver initialization entry point
  * @x: function to be run at kernel boot time or module insertion
  * 
- * module_init() will add the driver initialization routine in
- * the "__initcall.int" code segment if the driver is checked as
- * "y" or static, or else it will wrap the driver initialization
- * routine with init_module() which is used by insmod and
- * modprobe when the driver is used as a module.
- */
+ * module_init() will either be called during do_initcalls (if
+ * builtin) or at module insertion time (if a module).  There can only
+ * be one per module. */
 #define module_init(x)	__initcall(x);
 
 /**
@@ -126,39 +121,21 @@ extern struct kernel_param __setup_start, __setup_end;
  * with cleanup_module() when used with rmmod when
  * the driver is a module.  If the driver is statically
  * compiled into the kernel, module_exit() has no effect.
+ * There can only be one per module.
  */
 #define module_exit(x)	__exitcall(x);
 
-#else
-
-#define __init
-#define __exit
-#define __initdata
-#define __exitdata
-#define __initcall(fn)
-/* For assembly routines */
-#define __INIT
-#define __FINIT
-#define __INITDATA
-
-/* These macros create a dummy inline: gcc 2.9x does not count alias
- as usage, hence the `unused function' warning when __init functions
- are declared static. We use the dummy __*_module_inline functions
- both to kill the warning and check the type of the init/cleanup
- function. */
-typedef int (*__init_module_func_t)(void);
-typedef void (*__cleanup_module_func_t)(void);
-#define module_init(x) \
-	int init_module(void) __attribute__((alias(#x))); \
-	static inline __init_module_func_t __init_module_inline(void) \
-	{ return x; }
-#define module_exit(x) \
-	void cleanup_module(void) __attribute__((alias(#x))); \
-	static inline __cleanup_module_func_t __cleanup_module_inline(void) \
-	{ return x; }
+/**
+ * no_module_init - code needs no initialization.
+ *
+ * The equivalent of declaring an empty init function which returns 0.
+ * Every module must have exactly one module_init() or no_module_init
+ * invocation.  */
+#define no_module_init
 
-#define __setup(str,func) /* nothing */
+#else /* MODULE */
 
+/* Don't use these in modules, but some people do... */
 #define core_initcall(fn)		module_init(fn)
 #define postcore_initcall(fn)		module_init(fn)
 #define arch_initcall(fn)		module_init(fn)
@@ -167,6 +144,34 @@ typedef void (*__cleanup_module_func_t)(void);
 #define device_initcall(fn)		module_init(fn)
 #define late_initcall(fn)		module_init(fn)
 
+/* Each module knows its own name. */
+#define __DEFINE_MODULE_NAME						\
+	char __module_name[] __attribute__((section(".modulename"))) =	\
+	__stringify(KBUILD_MODNAME)
+
+/* These macros create a dummy inline: gcc 2.9x does not count alias
+ as usage, hence the `unused function' warning when __init functions
+ are declared static. We use the dummy __*_module_inline functions
+ both to kill the warning and check the type of the init/cleanup
+ function. */
+
+/* Each module must use one module_init(), or one no_module_init */
+#define module_init(initfn)					\
+	__DEFINE_MODULE_NAME;					\
+	static inline initcall_t __inittest(void)		\
+	{ return initfn; }					\
+	int __initfn(void) __attribute__((alias(#initfn)));
+
+#define no_module_init __DEFINE_MODULE_NAME
+
+/* This is only required if you want to be unloadable. */
+#define module_exit(exitfn)					\
+	static inline exitcall_t __exittest(void)		\
+	{ return exitfn; }					\
+	void __exitfn(void) __attribute__((alias(#exitfn)));
+
+
+#define __setup(str,func) /* nothing */
 #endif
 
 /* Data marked not to be saved by software_suspend() */

include/linux/kmod.h

@@ -28,6 +28,7 @@ extern int request_module(const char * name);
 static inline int request_module(const char * name) { return -ENOSYS; }
 #endif
 
+#define try_then_request_module(x, mod) ((x) ?: request_module(mod), (x))
 extern int exec_usermodehelper(char *program_path, char *argv[], char *envp[]);
 extern int call_usermodehelper(char *path, char *argv[], char *envp[]);
 

init/Kconfig

@@ -116,21 +116,14 @@ config MODULES
 	  may want to make use of modules with this kernel in the future, then
 	  say Y here.  If unsure, say Y.
 
-config MODVERSIONS
-	bool "Set version information on all module symbols"
+config MODULE_UNLOAD
+	bool "Module unloading"
 	depends on MODULES
-	---help---
-	  Usually, modules have to be recompiled whenever you switch to a new
-	  kernel.  Saying Y here makes it possible, and safe, to use the
-	  same modules even after compiling a new kernel; this requires the
-	  program modprobe. All the software needed for module support is in
-	  the modutils package (check the file <file:Documentation/Changes>
-	  for location and latest version).  NOTE: if you say Y here but don't
-	  have the program genksyms (which is also contained in the above
-	  mentioned modutils package), then the building of your kernel will
-	  fail.  If you are going to use modules that are generated from
-	  non-kernel sources, you would benefit from this option.  Otherwise
-	  it's not that important.  So, N ought to be a safe bet.
+	help
+	  Without this option you will not be able to unload any
+	  modules (note that some modules may not be unloadable
+	  anyway), which makes your kernel slightly smaller and
+	  simpler.  If unsure, say Y.
 
 config KMOD
 	bool "Kernel module loader"

init/main.c

@@ -406,9 +406,6 @@ asmlinkage void __init start_kernel(void)
 	 * this. But we do want output early, in case something goes wrong.
 	 */
 	console_init();
-#ifdef CONFIG_MODULES
-	init_modules();
-#endif
 	profile_init();
 	kmem_cache_init();
 	local_irq_enable();
@@ -457,6 +454,8 @@ asmlinkage void __init start_kernel(void)
 
 struct task_struct *child_reaper = &init_task;
 
+extern initcall_t __initcall_start, __initcall_end;
+
 static void __init do_initcalls(void)
 {
 	initcall_t *call;

kernel/Makefile

@@ -4,18 +4,18 @@
 
 export-objs = signal.o sys.o kmod.o workqueue.o ksyms.o pm.o exec_domain.o \
 		printk.o platform.o suspend.o dma.o module.o cpufreq.o \
-		profile.o rcupdate.o
+		profile.o rcupdate.o intermodule.o
 
 obj-y     = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
-	    module.o exit.o itimer.o time.o softirq.o resource.o \
+	    exit.o itimer.o time.o softirq.o resource.o \
 	    sysctl.o capability.o ptrace.o timer.o user.o \
 	    signal.o sys.o kmod.o workqueue.o futex.o platform.o pid.o \
-	    rcupdate.o
+	    rcupdate.o intermodule.o
 
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
 obj-$(CONFIG_SMP) += cpu.o
 obj-$(CONFIG_UID16) += uid16.o
-obj-$(CONFIG_MODULES) += ksyms.o
+obj-$(CONFIG_MODULES) += ksyms.o module.o
 obj-$(CONFIG_KALLSYMS) += kallsyms.o
 obj-$(CONFIG_PM) += pm.o
 obj-$(CONFIG_CPU_FREQ) += cpufreq.o

kernel/exec_domain.c

@@ -211,7 +211,12 @@ get_exec_domain_list(char *page)
 	for (ep = exec_domains; ep && len < PAGE_SIZE - 80; ep = ep->next)
 		len += sprintf(page + len, "%d-%d\t%-16s\t[%s]\n",
 			ep->pers_low, ep->pers_high, ep->name,
-			ep->module ? ep->module->name : "kernel");
+#ifdef CONFIG_MODULES
+			ep->module ? ep->module->name : "kernel"
+#else
+			"kernel"
+#endif
+			);
 	read_unlock(&exec_domains_lock);
 	return (len);
 }

kernel/intermodule.c

+/* Deprecated, do not use.  Moved from module.c to here. --RR */
+
+/* Written by Keith Owens <kaos@ocs.com.au> Oct 2000 */
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+/* inter_module functions are always available, even when the kernel is
+ * compiled without modules.  Consumers of inter_module_xxx routines
+ * will always work, even when both are built into the kernel, this
+ * approach removes lots of #ifdefs in mainline code.
+ */
+
+static struct list_head ime_list = LIST_HEAD_INIT(ime_list);
+static spinlock_t ime_lock = SPIN_LOCK_UNLOCKED;
+static int kmalloc_failed;
+
+struct inter_module_entry {
+	struct list_head list;
+	const char *im_name;
+	struct module *owner;
+	const void *userdata;
+};
+
+/**
+ * inter_module_register - register a new set of inter module data.
+ * @im_name: an arbitrary string to identify the data, must be unique
+ * @owner: module that is registering the data, always use THIS_MODULE
+ * @userdata: pointer to arbitrary userdata to be registered
+ *
+ * Description: Check that the im_name has not already been registered,
+ * complain if it has.  For new data, add it to the inter_module_entry
+ * list.
+ */
+void inter_module_register(const char *im_name, struct module *owner, const void *userdata)
+{
+	struct list_head *tmp;
+	struct inter_module_entry *ime, *ime_new;
+
+	if (!(ime_new = kmalloc(sizeof(*ime), GFP_KERNEL))) {
+		/* Overloaded kernel, not fatal */
+		printk(KERN_ERR
+			"Aiee, inter_module_register: cannot kmalloc entry for '%s'\n",
+			im_name);
+		kmalloc_failed = 1;
+		return;
+	}
+	memset(ime_new, 0, sizeof(*ime_new));
+	ime_new->im_name = im_name;
+	ime_new->owner = owner;
+	ime_new->userdata = userdata;
+
+	spin_lock(&ime_lock);
+	list_for_each(tmp, &ime_list) {
+		ime = list_entry(tmp, struct inter_module_entry, list);
+		if (strcmp(ime->im_name, im_name) == 0) {
+			spin_unlock(&ime_lock);
+			kfree(ime_new);
+			/* Program logic error, fatal */
+			printk(KERN_ERR "inter_module_register: duplicate im_name '%s'", im_name);
+			BUG();
+		}
+	}
+	list_add(&(ime_new->list), &ime_list);
+	spin_unlock(&ime_lock);
+}
+
+/**
+ * inter_module_unregister - unregister a set of inter module data.
+ * @im_name: an arbitrary string to identify the data, must be unique
+ *
+ * Description: Check that the im_name has been registered, complain if
+ * it has not.  For existing data, remove it from the
+ * inter_module_entry list.
+ */
+void inter_module_unregister(const char *im_name)
+{
+	struct list_head *tmp;
+	struct inter_module_entry *ime;
+
+	spin_lock(&ime_lock);
+	list_for_each(tmp, &ime_list) {
+		ime = list_entry(tmp, struct inter_module_entry, list);
+		if (strcmp(ime->im_name, im_name) == 0) {
+			list_del(&(ime->list));
+			spin_unlock(&ime_lock);
+			kfree(ime);
+			return;
+		}
+	}
+	spin_unlock(&ime_lock);
+	if (kmalloc_failed) {
+		printk(KERN_ERR
+			"inter_module_unregister: no entry for '%s', "
+			"probably caused by previous kmalloc failure\n",
+			im_name);
+		return;
+	}
+	else {
+		/* Program logic error, fatal */
+		printk(KERN_ERR "inter_module_unregister: no entry for '%s'", im_name);
+		BUG();
+	}
+}
+
+/**
+ * inter_module_get - return arbitrary userdata from another module.
+ * @im_name: an arbitrary string to identify the data, must be unique
+ *
+ * Description: If the im_name has not been registered, return NULL.
+ * Try to increment the use count on the owning module, if that fails
+ * then return NULL.  Otherwise return the userdata.
+ */
+const void *inter_module_get(const char *im_name)
+{
+	struct list_head *tmp;
+	struct inter_module_entry *ime;
+	const void *result = NULL;
+
+	spin_lock(&ime_lock);
+	list_for_each(tmp, &ime_list) {
+		ime = list_entry(tmp, struct inter_module_entry, list);
+		if (strcmp(ime->im_name, im_name) == 0) {
+			if (try_inc_mod_count(ime->owner))
+				result = ime->userdata;
+			break;
+		}
+	}
+	spin_unlock(&ime_lock);
+	return(result);
+}
+
+/**
+ * inter_module_get_request - im get with automatic request_module.
+ * @im_name: an arbitrary string to identify the data, must be unique
+ * @modname: module that is expected to register im_name
+ *
+ * Description: If inter_module_get fails, do request_module then retry.
+ */
+const void *inter_module_get_request(const char *im_name, const char *modname)
+{
+	const void *result = inter_module_get(im_name);
+	if (!result) {
+		request_module(modname);
+		result = inter_module_get(im_name);
+	}
+	return(result);
+}
+
+/**
+ * inter_module_put - release use of data from another module.
+ * @im_name: an arbitrary string to identify the data, must be unique
+ *
+ * Description: If the im_name has not been registered, complain,
+ * otherwise decrement the use count on the owning module.
+ */
+void inter_module_put(const char *im_name)
+{
+	struct list_head *tmp;
+	struct inter_module_entry *ime;
+
+	spin_lock(&ime_lock);
+	list_for_each(tmp, &ime_list) {
+		ime = list_entry(tmp, struct inter_module_entry, list);
+		if (strcmp(ime->im_name, im_name) == 0) {
+			if (ime->owner)
+				__MOD_DEC_USE_COUNT(ime->owner);
+			spin_unlock(&ime_lock);
+			return;
+		}
+	}
+	spin_unlock(&ime_lock);
+	printk(KERN_ERR "inter_module_put: no entry for '%s'", im_name);
+	BUG();
+}
+
+EXPORT_SYMBOL(inter_module_register);
+EXPORT_SYMBOL(inter_module_unregister);
+EXPORT_SYMBOL(inter_module_get);
+EXPORT_SYMBOL(inter_module_get_request);
+EXPORT_SYMBOL(inter_module_put);

kernel/kmod.c

@@ -155,7 +155,7 @@ char modprobe_path[256] = "/sbin/modprobe";
 static int exec_modprobe(void * module_name)
 {
 	static char * envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
-	char *argv[] = { modprobe_path, "-s", "-k", "--", (char*)module_name, NULL };
+	char *argv[] = { modprobe_path, "--", (char*)module_name, NULL };
 	int ret;
 
 	if (!system_running)

kernel/ksyms.c

@@ -71,14 +71,6 @@ __attribute__((section("__ksymtab"))) = {
 };
 #endif
 
-
-EXPORT_SYMBOL(inter_module_register);
-EXPORT_SYMBOL(inter_module_unregister);
-EXPORT_SYMBOL(inter_module_get);
-EXPORT_SYMBOL(inter_module_get_request);
-EXPORT_SYMBOL(inter_module_put);
-EXPORT_SYMBOL(try_inc_mod_count);
-
 /* process memory management */
 EXPORT_SYMBOL(do_mmap_pgoff);
 EXPORT_SYMBOL(do_munmap);

kernel/sys.c

@@ -206,6 +206,8 @@ cond_syscall(sys_acct)
 cond_syscall(sys_lookup_dcookie)
 cond_syscall(sys_swapon)
 cond_syscall(sys_swapoff)
+cond_syscall(sys_init_module)
+cond_syscall(sys_delete_module)
 
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {

lib/zlib_deflate/deflate_syms.c

@@ -19,3 +19,5 @@ EXPORT_SYMBOL(zlib_deflateReset);
 EXPORT_SYMBOL(zlib_deflateCopy);
 EXPORT_SYMBOL(zlib_deflateParams);
 MODULE_LICENSE("GPL");
+
+no_module_init;

lib/zlib_inflate/inflate_syms.c

@@ -20,3 +20,5 @@ EXPORT_SYMBOL(zlib_inflateReset);
 EXPORT_SYMBOL(zlib_inflateSyncPoint);
 EXPORT_SYMBOL(zlib_inflateIncomp); 
 MODULE_LICENSE("GPL");
+
+no_module_init;

net/ipv4/netfilter/ip_nat_helper.c

@@ -374,7 +374,7 @@ int ip_nat_helper_register(struct ip_nat_helper *me)
 		    && ct_helper->me) {
 			__MOD_INC_USE_COUNT(ct_helper->me);
 		} else {
-
+#ifdef CONFIG_MODULES
 			/* We are a NAT helper for protocol X.  If we need
 			 * respective conntrack helper for protoccol X, compute
 			 * conntrack helper name and try to load module */
@@ -403,6 +403,7 @@ int ip_nat_helper_register(struct ip_nat_helper *me)
 			       "because kernel was compiled without kernel "
 			       "module loader support\n", name);
 			return -EBUSY;
+#endif
 #endif
 		}
 	}
@@ -466,9 +467,12 @@ void ip_nat_helper_unregister(struct ip_nat_helper *me)
 		if ((ct_helper = ip_ct_find_helper(&me->tuple))
 		    && ct_helper->me) {
 			__MOD_DEC_USE_COUNT(ct_helper->me);
-		} else 
+		}
+#ifdef CONFIG_MODULES
+		else 
 			printk("%s: unable to decrement usage count"
 			       " of conntrack helper %s\n",
 			       __FUNCTION__, me->me->name);
+#endif
 	}
 }

net/ipv6/af_inet6.c

@@ -538,6 +538,7 @@ struct net_proto_family inet6_family_ops = {
 };
 
 #ifdef MODULE
+#if 0 /* FIXME --RR */
 int ipv6_unload(void)
 {
 	if (!unloadable) return 1;
@@ -545,6 +546,8 @@ int ipv6_unload(void)
 	return atomic_read(&(__this_module.uc.usecount)) - 3;
 }
 #endif
+#endif
+#endif
 
 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 extern void ipv6_sysctl_register(void);
@@ -624,10 +627,12 @@ static int __init inet6_init(void)
 	int err;
 
 #ifdef MODULE
+#if 0 /* FIXME --RR */
 	if (!mod_member_present(&__this_module, can_unload))
 	  return -EINVAL;
 
 	__this_module.can_unload = &ipv6_unload;
+#endif
 #endif
 
 	printk(KERN_INFO "IPv6 v0.8 for NET4.0\n");

scripts/Makefile.modinst

@@ -16,8 +16,8 @@ include scripts/Makefile.lib
 # ==========================================================================
 
 quiet_cmd_modules_install = INSTALL $(obj-m)
-      cmd_modules_install = mkdir -p $(MODLIB)/kernel/$(obj); \
-			    cp $(obj-m) $(MODLIB)/kernel/$(obj)
+      cmd_modules_install = mkdir -p $(MODLIB)/kernel && \
+		      cp $(obj-m) $(MODLIB)/kernel/
 
 modules_install: $(subdir-ym)
 ifneq ($(obj-m),)