From 785042f2e275089e22c36b462f6495ce8d91732d Mon Sep 17 00:00:00 2001 From: Boaz Harrosh Date: Thu, 31 May 2012 16:26:15 -0700 Subject: [PATCH] kmod: move call_usermodehelper_fns() to .c file and unexport all it's helpers If we move call_usermodehelper_fns() to kmod.c file and EXPORT_SYMBOL it we can avoid exporting all it's helper functions: call_usermodehelper_setup call_usermodehelper_setfns call_usermodehelper_exec And make all of them static to kmod.c Since the optimizer will see all these as a single call site it will inline them inside call_usermodehelper_fns(). So we loose the call to _fns but gain 3 calls to the helpers. (Not that it matters) Signed-off-by: Boaz Harrosh Cc: Oleg Nesterov Cc: Tetsuo Handa Cc: Ingo Molnar Cc: Peter Zijlstra Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/kmod.h | 30 ++---------------------------- kernel/kmod.c | 25 ++++++++++++++++++++++--- 2 files changed, 24 insertions(+), 31 deletions(-) diff --git a/include/linux/kmod.h b/include/linux/kmod.h index f07f9a4..5398d58 100644 --- a/include/linux/kmod.h +++ b/include/linux/kmod.h @@ -66,36 +66,10 @@ struct subprocess_info { void *data; }; -/* Allocate a subprocess_info structure */ -struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, - char **envp, gfp_t gfp_mask); - -/* Set various pieces of state into the subprocess_info structure */ -void call_usermodehelper_setfns(struct subprocess_info *info, - int (*init)(struct subprocess_info *info, struct cred *new), - void (*cleanup)(struct subprocess_info *info), - void *data); - -/* Actually execute the sub-process */ -int call_usermodehelper_exec(struct subprocess_info *info, int wait); - -static inline int +extern int call_usermodehelper_fns(char *path, char **argv, char **envp, int wait, int (*init)(struct subprocess_info *info, struct cred *new), - void (*cleanup)(struct subprocess_info *), void *data) -{ - struct subprocess_info *info; - gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; - - info = call_usermodehelper_setup(path, argv, envp, gfp_mask); - - if (info == NULL) - return -ENOMEM; - - call_usermodehelper_setfns(info, init, cleanup, data); - - return call_usermodehelper_exec(info, wait); -} + void (*cleanup)(struct subprocess_info *), void *data); static inline int call_usermodehelper(char *path, char **argv, char **envp, int wait) diff --git a/kernel/kmod.c b/kernel/kmod.c index 21a0f8e..1f596e4 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -478,6 +478,7 @@ static void helper_unlock(void) * structure. This should be passed to call_usermodehelper_exec to * exec the process and free the structure. */ +static struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, char **envp, gfp_t gfp_mask) { @@ -493,7 +494,6 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, out: return sub_info; } -EXPORT_SYMBOL(call_usermodehelper_setup); /** * call_usermodehelper_setfns - set a cleanup/init function @@ -511,6 +511,7 @@ EXPORT_SYMBOL(call_usermodehelper_setup); * Function must be runnable in either a process context or the * context in which call_usermodehelper_exec is called. */ +static void call_usermodehelper_setfns(struct subprocess_info *info, int (*init)(struct subprocess_info *info, struct cred *new), void (*cleanup)(struct subprocess_info *info), @@ -520,7 +521,6 @@ void call_usermodehelper_setfns(struct subprocess_info *info, info->init = init; info->data = data; } -EXPORT_SYMBOL(call_usermodehelper_setfns); /** * call_usermodehelper_exec - start a usermode application @@ -534,6 +534,7 @@ EXPORT_SYMBOL(call_usermodehelper_setfns); * asynchronously if wait is not set, and runs as a child of keventd. * (ie. it runs with full root capabilities). */ +static int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait) { DECLARE_COMPLETION_ONSTACK(done); @@ -575,7 +576,25 @@ unlock: helper_unlock(); return retval; } -EXPORT_SYMBOL(call_usermodehelper_exec); + +int call_usermodehelper_fns( + char *path, char **argv, char **envp, int wait, + int (*init)(struct subprocess_info *info, struct cred *new), + void (*cleanup)(struct subprocess_info *), void *data) +{ + struct subprocess_info *info; + gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; + + info = call_usermodehelper_setup(path, argv, envp, gfp_mask); + + if (info == NULL) + return -ENOMEM; + + call_usermodehelper_setfns(info, init, cleanup, data); + + return call_usermodehelper_exec(info, wait); +} +EXPORT_SYMBOL(call_usermodehelper_fns); static int proc_cap_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) -- 2.7.4