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authorLuis R. Rodriguez <mcgrof@suse.com>2015-03-30 16:20:03 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-20 00:25:24 -0700
commitecc8617053e0a97272ef2eee138809f30080e84b (patch)
treef9433e1dd51aea5b6f66db03460a9f2c1c3f4f4d
parent6570a9a1ce3a1dd227a065fd8ad16778d827b753 (diff)
downloadlinux-sh-ecc8617053e0a97272ef2eee138809f30080e84b.tar.gz
module: add extra argument for parse_params() callback
This adds an extra argument onto parse_params() to be used as a way to make the unused callback a bit more useful and generic by allowing the caller to pass on a data structure of its choice. An example use case is to allow us to easily make module parameters for every module which we will do next. @ parse @ identifier name, args, params, num, level_min, level_max; identifier unknown, param, val, doing; type s16; @@ extern char *parse_args(const char *name, char *args, const struct kernel_param *params, unsigned num, s16 level_min, s16 level_max, + void *arg, int (*unknown)(char *param, char *val, const char *doing + , void *arg )); @ parse_mod @ identifier name, args, params, num, level_min, level_max; identifier unknown, param, val, doing; type s16; @@ char *parse_args(const char *name, char *args, const struct kernel_param *params, unsigned num, s16 level_min, s16 level_max, + void *arg, int (*unknown)(char *param, char *val, const char *doing + , void *arg )) { ... } @ parse_args_found @ expression R, E1, E2, E3, E4, E5, E6; identifier func; @@ ( R = parse_args(E1, E2, E3, E4, E5, E6, + NULL, func); | R = parse_args(E1, E2, E3, E4, E5, E6, + NULL, &func); | R = parse_args(E1, E2, E3, E4, E5, E6, + NULL, NULL); | parse_args(E1, E2, E3, E4, E5, E6, + NULL, func); | parse_args(E1, E2, E3, E4, E5, E6, + NULL, &func); | parse_args(E1, E2, E3, E4, E5, E6, + NULL, NULL); ) @ parse_args_unused depends on parse_args_found @ identifier parse_args_found.func; @@ int func(char *param, char *val, const char *unused + , void *arg ) { ... } @ mod_unused depends on parse_args_found @ identifier parse_args_found.func; expression A1, A2, A3; @@ - func(A1, A2, A3); + func(A1, A2, A3, NULL); Generated-by: Coccinelle SmPL Cc: cocci@systeme.lip6.fr Cc: Tejun Heo <tj@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Christoph Hellwig <hch@infradead.org> Cc: Felipe Contreras <felipe.contreras@gmail.com> Cc: Ewan Milne <emilne@redhat.com> Cc: Jean Delvare <jdelvare@suse.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Jani Nikula <jani.nikula@intel.com> Cc: linux-kernel@vger.kernel.org Reviewed-by: Tejun Heo <tj@kernel.org> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/powerpc/mm/hugetlbpage.c4
-rw-r--r--include/linux/moduleparam.h3
-rw-r--r--init/main.c25
-rw-r--r--kernel/module.c6
-rw-r--r--kernel/params.c11
-rw-r--r--lib/dynamic_debug.c4
6 files changed, 32 insertions, 21 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 0ce968b00b7c..d230158c9770 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -336,7 +336,7 @@ int alloc_bootmem_huge_page(struct hstate *hstate)
unsigned long gpage_npages[MMU_PAGE_COUNT];
static int __init do_gpage_early_setup(char *param, char *val,
- const char *unused)
+ const char *unused, void *arg)
{
static phys_addr_t size;
unsigned long npages;
@@ -385,7 +385,7 @@ void __init reserve_hugetlb_gpages(void)
strlcpy(cmdline, boot_command_line, COMMAND_LINE_SIZE);
parse_args("hugetlb gpages", cmdline, NULL, 0, 0, 0,
- &do_gpage_early_setup);
+ NULL, &do_gpage_early_setup);
/*
* Walk gpage list in reverse, allocating larger page sizes first.
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 1c9effa25e26..13923709d30d 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -357,8 +357,9 @@ extern char *parse_args(const char *name,
unsigned num,
s16 level_min,
s16 level_max,
+ void *arg,
int (*unknown)(char *param, char *val,
- const char *doing));
+ const char *doing, void *arg));
/* Called by module remove. */
#ifdef CONFIG_SYSFS
diff --git a/init/main.c b/init/main.c
index 2115055faeac..edcb13440646 100644
--- a/init/main.c
+++ b/init/main.c
@@ -235,7 +235,8 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
/* Change NUL term back to "=", to make "param" the whole string. */
-static int __init repair_env_string(char *param, char *val, const char *unused)
+static int __init repair_env_string(char *param, char *val,
+ const char *unused, void *arg)
{
if (val) {
/* param=val or param="val"? */
@@ -252,14 +253,15 @@ static int __init repair_env_string(char *param, char *val, const char *unused)
}
/* Anything after -- gets handed straight to init. */
-static int __init set_init_arg(char *param, char *val, const char *unused)
+static int __init set_init_arg(char *param, char *val,
+ const char *unused, void *arg)
{
unsigned int i;
if (panic_later)
return 0;
- repair_env_string(param, val, unused);
+ repair_env_string(param, val, unused, NULL);
for (i = 0; argv_init[i]; i++) {
if (i == MAX_INIT_ARGS) {
@@ -276,9 +278,10 @@ static int __init set_init_arg(char *param, char *val, const char *unused)
* Unknown boot options get handed to init, unless they look like
* unused parameters (modprobe will find them in /proc/cmdline).
*/
-static int __init unknown_bootoption(char *param, char *val, const char *unused)
+static int __init unknown_bootoption(char *param, char *val,
+ const char *unused, void *arg)
{
- repair_env_string(param, val, unused);
+ repair_env_string(param, val, unused, NULL);
/* Handle obsolete-style parameters */
if (obsolete_checksetup(param))
@@ -410,7 +413,8 @@ static noinline void __init_refok rest_init(void)
}
/* Check for early params. */
-static int __init do_early_param(char *param, char *val, const char *unused)
+static int __init do_early_param(char *param, char *val,
+ const char *unused, void *arg)
{
const struct obs_kernel_param *p;
@@ -429,7 +433,8 @@ static int __init do_early_param(char *param, char *val, const char *unused)
void __init parse_early_options(char *cmdline)
{
- parse_args("early options", cmdline, NULL, 0, 0, 0, do_early_param);
+ parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
+ do_early_param);
}
/* Arch code calls this early on, or if not, just before other parsing. */
@@ -535,10 +540,10 @@ asmlinkage __visible void __init start_kernel(void)
after_dashes = parse_args("Booting kernel",
static_command_line, __start___param,
__stop___param - __start___param,
- -1, -1, &unknown_bootoption);
+ -1, -1, NULL, &unknown_bootoption);
if (!IS_ERR_OR_NULL(after_dashes))
parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
- set_init_arg);
+ NULL, set_init_arg);
jump_label_init();
@@ -847,7 +852,7 @@ static void __init do_initcall_level(int level)
initcall_command_line, __start___param,
__stop___param - __start___param,
level, level,
- &repair_env_string);
+ NULL, &repair_env_string);
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
do_one_initcall(*fn);
diff --git a/kernel/module.c b/kernel/module.c
index 42a1d2afb217..24d1f31d02f2 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3237,7 +3237,8 @@ out:
return err;
}
-static int unknown_module_param_cb(char *param, char *val, const char *modname)
+static int unknown_module_param_cb(char *param, char *val, const char *modname,
+ void *arg)
{
/* Check for magic 'dyndbg' arg */
int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
@@ -3342,7 +3343,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
/* Module is ready to execute: parsing args may do that. */
after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
- -32768, 32767, unknown_module_param_cb);
+ -32768, 32767, NULL,
+ unknown_module_param_cb);
if (IS_ERR(after_dashes)) {
err = PTR_ERR(after_dashes);
goto bug_cleanup;
diff --git a/kernel/params.c b/kernel/params.c
index a22d6a759b1a..30288c1e15dd 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -100,8 +100,9 @@ static int parse_one(char *param,
unsigned num_params,
s16 min_level,
s16 max_level,
+ void *arg,
int (*handle_unknown)(char *param, char *val,
- const char *doing))
+ const char *doing, void *arg))
{
unsigned int i;
int err;
@@ -128,7 +129,7 @@ static int parse_one(char *param,
if (handle_unknown) {
pr_debug("doing %s: %s='%s'\n", doing, param, val);
- return handle_unknown(param, val, doing);
+ return handle_unknown(param, val, doing, arg);
}
pr_debug("Unknown argument '%s'\n", param);
@@ -194,7 +195,9 @@ char *parse_args(const char *doing,
unsigned num,
s16 min_level,
s16 max_level,
- int (*unknown)(char *param, char *val, const char *doing))
+ void *arg,
+ int (*unknown)(char *param, char *val,
+ const char *doing, void *arg))
{
char *param, *val;
@@ -214,7 +217,7 @@ char *parse_args(const char *doing,
return args;
irq_was_disabled = irqs_disabled();
ret = parse_one(param, val, doing, params, num,
- min_level, max_level, unknown);
+ min_level, max_level, arg, unknown);
if (irq_was_disabled && !irqs_disabled())
pr_warn("%s: option '%s' enabled irq's!\n",
doing, param);
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index d8f3d3150603..e491e02eff54 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -887,7 +887,7 @@ static int ddebug_dyndbg_param_cb(char *param, char *val,
/* handle both dyndbg and $module.dyndbg params at boot */
static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
- const char *unused)
+ const char *unused, void *arg)
{
vpr_info("%s=\"%s\"\n", param, val);
return ddebug_dyndbg_param_cb(param, val, NULL, 0);
@@ -1028,7 +1028,7 @@ static int __init dynamic_debug_init(void)
*/
cmdline = kstrdup(saved_command_line, GFP_KERNEL);
parse_args("dyndbg params", cmdline, NULL,
- 0, 0, 0, &ddebug_dyndbg_boot_param_cb);
+ 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
kfree(cmdline);
return 0;