diff options
| -rw-r--r-- | include/linux/dynamic_debug.h | 13 | ||||
| -rw-r--r-- | kernel/module/internal.h | 4 | ||||
| -rw-r--r-- | kernel/module/main.c | 18 | ||||
| -rw-r--r-- | lib/dynamic_debug.c | 40 |
4 files changed, 50 insertions, 25 deletions
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 8d9eec5f6d8b..6a2001250da1 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -51,12 +51,16 @@ struct _ddebug { #endif } __attribute__((aligned(8))); - +/* encapsulate linker provided built-in (or module) dyndbg data */ +struct _ddebug_info { + struct _ddebug *descs; + unsigned int num_descs; +}; #if defined(CONFIG_DYNAMIC_DEBUG_CORE) -int ddebug_add_module(struct _ddebug *tab, unsigned int n, - const char *modname); +int ddebug_add_module(struct _ddebug_info *dyndbg, const char *modname); + extern int ddebug_remove_module(const char *mod_name); extern __printf(2, 3) void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...); @@ -184,8 +188,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, #include <linux/errno.h> #include <linux/printk.h> -static inline int ddebug_add_module(struct _ddebug *tab, unsigned int n, - const char *modname) +static inline int ddebug_add_module(struct _ddebug_info *dinfo, const char *modname) { return 0; } diff --git a/kernel/module/internal.h b/kernel/module/internal.h index 680d980a4fb2..2e2bf236f558 100644 --- a/kernel/module/internal.h +++ b/kernel/module/internal.h @@ -53,6 +53,7 @@ extern const struct kernel_symbol __stop___ksymtab_gpl[]; extern const s32 __start___kcrctab[]; extern const s32 __start___kcrctab_gpl[]; +#include <linux/dynamic_debug.h> struct load_info { const char *name; /* pointer to module in temporary copy, freed at end of load_module() */ @@ -62,8 +63,7 @@ struct load_info { Elf_Shdr *sechdrs; char *secstrings, *strtab; unsigned long symoffs, stroffs, init_typeoffs, core_typeoffs; - struct _ddebug *debug; - unsigned int num_debug; + struct _ddebug_info dyndbg; bool sig_ok; #ifdef CONFIG_KALLSYMS unsigned long mod_kallsyms_init_off; diff --git a/kernel/module/main.c b/kernel/module/main.c index 6a477c622544..a26b436ad992 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1598,16 +1598,16 @@ static void free_modinfo(struct module *mod) } } -static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) +static void dynamic_debug_setup(struct module *mod, struct _ddebug_info *dyndbg) { - if (!debug) + if (!dyndbg->num_descs) return; - ddebug_add_module(debug, num, mod->name); + ddebug_add_module(dyndbg, mod->name); } -static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) +static void dynamic_debug_remove(struct module *mod, struct _ddebug_info *dyndbg) { - if (debug) + if (dyndbg->num_descs) ddebug_remove_module(mod->name); } @@ -2111,8 +2111,8 @@ static int find_module_sections(struct module *mod, struct load_info *info) if (section_addr(info, "__obsparm")) pr_warn("%s: Ignoring obsolete parameters\n", mod->name); - info->debug = section_objs(info, "__dyndbg", - sizeof(*info->debug), &info->num_debug); + info->dyndbg.descs = section_objs(info, "__dyndbg", + sizeof(*info->dyndbg.descs), &info->dyndbg.num_descs); return 0; } @@ -2807,7 +2807,7 @@ static int load_module(struct load_info *info, const char __user *uargs, } init_build_id(mod, info); - dynamic_debug_setup(mod, info->debug, info->num_debug); + dynamic_debug_setup(mod, &info->dyndbg); /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ ftrace_module_init(mod); @@ -2871,7 +2871,7 @@ static int load_module(struct load_info *info, const char __user *uargs, ddebug_cleanup: ftrace_release_mod(mod); - dynamic_debug_remove(mod, info->debug); + dynamic_debug_remove(mod, &info->dyndbg); synchronize_rcu(); kfree(mod->args); free_arch_cleanup: diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 2e8ebef3bd0d..c358ccdf4a39 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -923,14 +923,20 @@ static const struct proc_ops proc_fops = { * Allocate a new ddebug_table for the given module * and add it to the global list. */ -int ddebug_add_module(struct _ddebug *tab, unsigned int n, - const char *name) +static int __ddebug_add_module(struct _ddebug_info *di, unsigned int base, + const char *modname) { struct ddebug_table *dt; + v3pr_info("add-module: %s.%d sites\n", modname, di->num_descs); + if (!di->num_descs) { + v3pr_info(" skip %s\n", modname); + return 0; + } + dt = kzalloc(sizeof(*dt), GFP_KERNEL); if (dt == NULL) { - pr_err("error adding module: %s\n", name); + pr_err("error adding module: %s\n", modname); return -ENOMEM; } /* @@ -939,18 +945,25 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n, * member of struct module, which lives at least as long as * this struct ddebug_table. */ - dt->mod_name = name; - dt->num_ddebugs = n; - dt->ddebugs = tab; + dt->mod_name = modname; + dt->ddebugs = di->descs; + dt->num_ddebugs = di->num_descs; + + INIT_LIST_HEAD(&dt->link); mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); - vpr_info("%3u debug prints in module %s\n", n, dt->mod_name); + vpr_info("%3u debug prints in module %s\n", di->num_descs, modname); return 0; } +int ddebug_add_module(struct _ddebug_info *di, const char *modname) +{ + return __ddebug_add_module(di, 0, modname); +} + /* helper for ddebug_dyndbg_(boot|module)_param_cb */ static int ddebug_dyndbg_param_cb(char *param, char *val, const char *modname, int on_err) @@ -1064,6 +1077,11 @@ static int __init dynamic_debug_init(void) const char *modname; char *cmdline; + struct _ddebug_info di = { + .descs = __start___dyndbg, + .num_descs = __stop___dyndbg - __start___dyndbg, + }; + if (&__start___dyndbg == &__stop___dyndbg) { if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); @@ -1082,7 +1100,9 @@ static int __init dynamic_debug_init(void) if (strcmp(modname, iter->modname)) { mod_ct++; - ret = ddebug_add_module(iter_mod_start, mod_sites, modname); + di.num_descs = mod_sites; + di.descs = iter_mod_start; + ret = __ddebug_add_module(&di, i - mod_sites, modname); if (ret) goto out_err; @@ -1091,7 +1111,9 @@ static int __init dynamic_debug_init(void) iter_mod_start = iter; } } - ret = ddebug_add_module(iter_mod_start, mod_sites, modname); + di.num_descs = mod_sites; + di.descs = iter_mod_start; + ret = __ddebug_add_module(&di, i - mod_sites, modname); if (ret) goto out_err; |