diff options
| -rw-r--r-- | arch/i386/mm/pageattr.c | 4 | ||||
| -rw-r--r-- | drivers/char/sysrq.c | 19 | ||||
| -rw-r--r-- | include/linux/mm.h | 4 | ||||
| -rw-r--r-- | kernel/exit.c | 5 | ||||
| -rw-r--r-- | kernel/sched.c | 1 | ||||
| -rw-r--r-- | mm/page_alloc.c | 3 | ||||
| -rw-r--r-- | mm/slab.c | 1 |
7 files changed, 37 insertions, 0 deletions
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c index c30a16df6440..e8a53552b13d 100644 --- a/arch/i386/mm/pageattr.c +++ b/arch/i386/mm/pageattr.c @@ -222,6 +222,10 @@ void kernel_map_pages(struct page *page, int numpages, int enable) { if (PageHighMem(page)) return; + if (!enable) + mutex_debug_check_no_locks_freed(page_address(page), + page_address(page+numpages)); + /* the return value is ignored - the calls cannot fail, * large pages are disabled at boot time. */ diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c index 145275ebdd7e..5765f672e853 100644 --- a/drivers/char/sysrq.c +++ b/drivers/char/sysrq.c @@ -153,6 +153,21 @@ static struct sysrq_key_op sysrq_mountro_op = { /* END SYNC SYSRQ HANDLERS BLOCK */ +#ifdef CONFIG_DEBUG_MUTEXES + +static void +sysrq_handle_showlocks(int key, struct pt_regs *pt_regs, struct tty_struct *tty) +{ + mutex_debug_show_all_locks(); +} + +static struct sysrq_key_op sysrq_showlocks_op = { + .handler = sysrq_handle_showlocks, + .help_msg = "show-all-locks(D)", + .action_msg = "Show Locks Held", +}; + +#endif /* SHOW SYSRQ HANDLERS BLOCK */ @@ -294,7 +309,11 @@ static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = { #else /* c */ NULL, #endif +#ifdef CONFIG_DEBUG_MUTEXES +/* d */ &sysrq_showlocks_op, +#else /* d */ NULL, +#endif /* e */ &sysrq_term_op, /* f */ &sysrq_moom_op, /* g */ NULL, diff --git a/include/linux/mm.h b/include/linux/mm.h index df80e63903b5..3f1fafc0245e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -13,6 +13,7 @@ #include <linux/rbtree.h> #include <linux/prio_tree.h> #include <linux/fs.h> +#include <linux/mutex.h> struct mempolicy; struct anon_vma; @@ -1024,6 +1025,9 @@ static inline void vm_stat_account(struct mm_struct *mm, static inline void kernel_map_pages(struct page *page, int numpages, int enable) { + if (!PageHighMem(page) && !enable) + mutex_debug_check_no_locks_freed(page_address(page), + page_address(page + numpages)); } #endif diff --git a/kernel/exit.c b/kernel/exit.c index caceabf3f230..309a46fa16f8 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -29,6 +29,7 @@ #include <linux/syscalls.h> #include <linux/signal.h> #include <linux/cn_proc.h> +#include <linux/mutex.h> #include <asm/uaccess.h> #include <asm/unistd.h> @@ -869,6 +870,10 @@ fastcall NORET_TYPE void do_exit(long code) mpol_free(tsk->mempolicy); tsk->mempolicy = NULL; #endif + /* + * If DEBUG_MUTEXES is on, make sure we are holding no locks: + */ + mutex_debug_check_no_locks_held(tsk); /* PF_DEAD causes final put_task_struct after we schedule. */ preempt_disable(); diff --git a/kernel/sched.c b/kernel/sched.c index 92733091154c..34a945bcc022 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4386,6 +4386,7 @@ void show_state(void) } while_each_thread(g, p); read_unlock(&tasklist_lock); + mutex_debug_show_all_locks(); } /** diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e0e84924171b..a5e6891f7bb6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -415,6 +415,9 @@ static void __free_pages_ok(struct page *page, unsigned int order) int reserved = 0; arch_free_page(page, order); + if (!PageHighMem(page)) + mutex_debug_check_no_locks_freed(page_address(page), + page_address(page+(1<<order))); #ifndef CONFIG_MMU for (i = 1 ; i < (1 << order) ; ++i) diff --git a/mm/slab.c b/mm/slab.c index 1c46c6383552..33aab345cd4a 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3071,6 +3071,7 @@ void kfree(const void *objp) local_irq_save(flags); kfree_debugcheck(objp); c = page_get_cache(virt_to_page(objp)); + mutex_debug_check_no_locks_freed(objp, objp+obj_reallen(c)); __cache_free(c, (void *)objp); local_irq_restore(flags); } |