From 9fb48c744ba6a4bf58b666f4e6fdac3008ea1bd4 Mon Sep 17 00:00:00 2001 From: Jim Cromie Date: Fri, 27 Apr 2012 14:30:34 -0600 Subject: params: add 3rd arg to option handler callback signature Add a 3rd arg, named "doing", to unknown-options callbacks invoked from parse_args(). The arg is passed as: "Booting kernel" from start_kernel(), initcall_level_names[i] from do_initcall_level(), mod->name from load_module(), via parse_args(), parse_one() parse_args() already has the "name" parameter, which is renamed to "doing" to better reflect current uses 1,2 above. parse_args() passes it to an altered parse_one(), which now passes it down into the unknown option handler callbacks. The mod->name will be needed to handle dyndbg for loadable modules, since params passed by modprobe are not qualified (they do not have a "$modname." prefix), and by the time the unknown-param callback is called, the module name is not otherwise available. Minor tweaks: Add param-name to parse_one's pr_debug(), current message doesnt identify the param being handled, add it. Add a pr_info to print current level and level_name of the initcall, and number of registered initcalls at that level. This adds 7 lines to dmesg output, like: initlevel:6=device, 172 registered initcalls Drop "parameters" from initcall_level_names[], its unhelpful in the pr_info() added above. This array is passed into parse_args() by do_initcall_level(). CC: Rusty Russell Signed-off-by: Jim Cromie Acked-by: Jason Baron Signed-off-by: Greg Kroah-Hartman --- kernel/params.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) (limited to 'kernel/params.c') diff --git a/kernel/params.c b/kernel/params.c index f37d82631347..b60e2c74b961 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -85,11 +85,13 @@ bool parameq(const char *a, const char *b) static int parse_one(char *param, char *val, + const char *doing, const struct kernel_param *params, unsigned num_params, s16 min_level, s16 max_level, - int (*handle_unknown)(char *param, char *val)) + int (*handle_unknown)(char *param, char *val, + const char *doing)) { unsigned int i; int err; @@ -104,8 +106,8 @@ static int parse_one(char *param, if (!val && params[i].ops->set != param_set_bool && params[i].ops->set != param_set_bint) return -EINVAL; - pr_debug("They are equal! Calling %p\n", - params[i].ops->set); + pr_debug("handling %s with %p\n", param, + params[i].ops->set); mutex_lock(¶m_lock); err = params[i].ops->set(val, ¶ms[i]); mutex_unlock(¶m_lock); @@ -114,11 +116,11 @@ static int parse_one(char *param, } if (handle_unknown) { - pr_debug("Unknown argument: calling %p\n", handle_unknown); - return handle_unknown(param, val); + pr_debug("doing %s: %s='%s'\n", doing, param, val); + return handle_unknown(param, val, doing); } - pr_debug("Unknown argument `%s'\n", param); + pr_debug("Unknown argument '%s'\n", param); return -ENOENT; } @@ -175,28 +177,29 @@ static char *next_arg(char *args, char **param, char **val) } /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ -int parse_args(const char *name, +int parse_args(const char *doing, char *args, const struct kernel_param *params, unsigned num, s16 min_level, s16 max_level, - int (*unknown)(char *param, char *val)) + int (*unknown)(char *param, char *val, const char *doing)) { char *param, *val; - pr_debug("Parsing ARGS: %s\n", args); - /* Chew leading spaces */ args = skip_spaces(args); + if (args && *args) + pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); + while (*args) { int ret; int irq_was_disabled; args = next_arg(args, ¶m, &val); irq_was_disabled = irqs_disabled(); - ret = parse_one(param, val, params, num, + ret = parse_one(param, val, doing, params, num, min_level, max_level, unknown); if (irq_was_disabled && !irqs_disabled()) { printk(KERN_WARNING "parse_args(): option '%s' enabled " @@ -205,19 +208,19 @@ int parse_args(const char *name, switch (ret) { case -ENOENT: printk(KERN_ERR "%s: Unknown parameter `%s'\n", - name, param); + doing, param); return ret; case -ENOSPC: printk(KERN_ERR "%s: `%s' too large for parameter `%s'\n", - name, val ?: "", param); + doing, val ?: "", param); return ret; case 0: break; default: printk(KERN_ERR "%s: `%s' invalid for parameter `%s'\n", - name, val ?: "", param); + doing, val ?: "", param); return ret; } } -- cgit v1.3-8-gc7d7 From 1ef9eaf2bf8901e92bb931875a5621692c8a0b84 Mon Sep 17 00:00:00 2001 From: Jim Cromie Date: Thu, 3 May 2012 11:57:37 -0600 Subject: params.c: fix Smack complaint about parse_args In commit 9fb48c744: "params: add 3rd arg to option handler callback signature", the if-guard added to the pr_debug was overzealous; no callers pass NULL, and existing code above and below the guard assumes as much. Change the if-guard to match, and silence the Smack complaint. CC: Dan Carpenter Signed-off-by: Jim Cromie Signed-off-by: Greg Kroah-Hartman --- kernel/params.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/params.c') diff --git a/kernel/params.c b/kernel/params.c index b60e2c74b961..be78c904b564 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -190,7 +190,7 @@ int parse_args(const char *doing, /* Chew leading spaces */ args = skip_spaces(args); - if (args && *args) + if (*args) pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args); while (*args) { -- cgit v1.3-8-gc7d7 From b5f3abf950f16fa615dc621e38eec63b2cc67946 Mon Sep 17 00:00:00 2001 From: Jim Cromie Date: Thu, 3 May 2012 18:22:44 -0600 Subject: params: replace printk(KERN_...) with pr_(...) I left 1 printk which uses __FILE__, __LINE__ explicitly, which should not be subject to generic preferences expressed via pr_fmt(). + tweaks suggested by Joe Perches: - add doing to irq-enabled warning, like others. It wont happen often.. - change sysfs failure crit, not just err, make it 1 line in logs. - coalese 2 format fragments into 1 >80 char line cc: Joe Perches Signed-off-by: Jim Cromie Signed-off-by: Greg Kroah-Hartman --- kernel/params.c | 33 ++++++++++++--------------------- 1 file changed, 12 insertions(+), 21 deletions(-) (limited to 'kernel/params.c') diff --git a/kernel/params.c b/kernel/params.c index be78c904b564..ed35345be536 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -201,25 +201,22 @@ int parse_args(const char *doing, irq_was_disabled = irqs_disabled(); ret = parse_one(param, val, doing, params, num, min_level, max_level, unknown); - if (irq_was_disabled && !irqs_disabled()) { - printk(KERN_WARNING "parse_args(): option '%s' enabled " - "irq's!\n", param); - } + if (irq_was_disabled && !irqs_disabled()) + pr_warn("%s: option '%s' enabled irq's!\n", + doing, param); + switch (ret) { case -ENOENT: - printk(KERN_ERR "%s: Unknown parameter `%s'\n", - doing, param); + pr_err("%s: Unknown parameter `%s'\n", doing, param); return ret; case -ENOSPC: - printk(KERN_ERR - "%s: `%s' too large for parameter `%s'\n", + pr_err("%s: `%s' too large for parameter `%s'\n", doing, val ?: "", param); return ret; case 0: break; default: - printk(KERN_ERR - "%s: `%s' invalid for parameter `%s'\n", + pr_err("%s: `%s' invalid for parameter `%s'\n", doing, val ?: "", param); return ret; } @@ -266,8 +263,7 @@ STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); int param_set_charp(const char *val, const struct kernel_param *kp) { if (strlen(val) > 1024) { - printk(KERN_ERR "%s: string parameter too long\n", - kp->name); + pr_err("%s: string parameter too long\n", kp->name); return -ENOSPC; } @@ -403,8 +399,7 @@ static int param_array(const char *name, int len; if (*num == max) { - printk(KERN_ERR "%s: can only take %i arguments\n", - name, max); + pr_err("%s: can only take %i arguments\n", name, max); return -EINVAL; } len = strcspn(val, ","); @@ -423,8 +418,7 @@ static int param_array(const char *name, } while (save == ','); if (*num < min) { - printk(KERN_ERR "%s: needs at least %i arguments\n", - name, min); + pr_err("%s: needs at least %i arguments\n", name, min); return -EINVAL; } return 0; @@ -483,7 +477,7 @@ int param_set_copystring(const char *val, const struct kernel_param *kp) const struct kparam_string *kps = kp->str; if (strlen(val)+1 > kps->maxlen) { - printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", + pr_err("%s: string doesn't fit in %u chars.\n", kp->name, kps->maxlen-1); return -ENOSPC; } @@ -753,11 +747,8 @@ static struct module_kobject * __init locate_module_kobject(const char *name) #endif if (err) { kobject_put(&mk->kobj); - printk(KERN_ERR - "Module '%s' failed add to sysfs, error number %d\n", + pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n", name, err); - printk(KERN_ERR - "The system will be unstable now.\n"); return NULL; } -- cgit v1.3-8-gc7d7