diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 3 | ||||
| -rw-r--r-- | lib/Makefile | 4 | ||||
| -rw-r--r-- | lib/llist.c | 74 | ||||
| -rw-r--r-- | lib/smp_processor_id.c | 2 |
4 files changed, 19 insertions, 64 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 6c695ff9cab..32f3e5ae2be 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -276,7 +276,4 @@ config CORDIC so its calculations are in fixed point. Modules can select this when they require this function. Module will be called cordic. -config LLIST - bool - endmenu diff --git a/lib/Makefile b/lib/Makefile index 3f5bc6d903e..a4da283f5dc 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -22,7 +22,7 @@ lib-y += kobject.o kref.o klist.o obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \ - bsearch.o find_last_bit.o find_next_bit.o + bsearch.o find_last_bit.o find_next_bit.o llist.o obj-y += kstrtox.o obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o @@ -115,8 +115,6 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o obj-$(CONFIG_CORDIC) += cordic.o -obj-$(CONFIG_LLIST) += llist.o - hostprogs-y := gen_crc32table clean-files := crc32table.h diff --git a/lib/llist.c b/lib/llist.c index da445724fa1..700cff77a38 100644 --- a/lib/llist.c +++ b/lib/llist.c @@ -3,8 +3,8 @@ * * The basic atomic operation of this list is cmpxchg on long. On * architectures that don't have NMI-safe cmpxchg implementation, the - * list can NOT be used in NMI handler. So code uses the list in NMI - * handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG. + * list can NOT be used in NMI handlers. So code that uses the list in + * an NMI handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG. * * Copyright 2010,2011 Intel Corp. * Author: Huang Ying <ying.huang@intel.com> @@ -30,48 +30,28 @@ #include <asm/system.h> /** - * llist_add - add a new entry - * @new: new entry to be added - * @head: the head for your lock-less list - */ -void llist_add(struct llist_node *new, struct llist_head *head) -{ - struct llist_node *entry, *old_entry; - -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - - entry = head->first; - do { - old_entry = entry; - new->next = entry; - cpu_relax(); - } while ((entry = cmpxchg(&head->first, old_entry, new)) != old_entry); -} -EXPORT_SYMBOL_GPL(llist_add); - -/** * llist_add_batch - add several linked entries in batch * @new_first: first entry in batch to be added * @new_last: last entry in batch to be added * @head: the head for your lock-less list + * + * Return whether list is empty before adding. */ -void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last, +bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last, struct llist_head *head) { struct llist_node *entry, *old_entry; -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - entry = head->first; - do { + for (;;) { old_entry = entry; new_last->next = entry; - cpu_relax(); - } while ((entry = cmpxchg(&head->first, old_entry, new_first)) != old_entry); + entry = cmpxchg(&head->first, old_entry, new_first); + if (entry == old_entry) + break; + } + + return old_entry == NULL; } EXPORT_SYMBOL_GPL(llist_add_batch); @@ -93,37 +73,17 @@ struct llist_node *llist_del_first(struct llist_head *head) { struct llist_node *entry, *old_entry, *next; -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - entry = head->first; - do { + for (;;) { if (entry == NULL) return NULL; old_entry = entry; next = entry->next; - cpu_relax(); - } while ((entry = cmpxchg(&head->first, old_entry, next)) != old_entry); + entry = cmpxchg(&head->first, old_entry, next); + if (entry == old_entry) + break; + } return entry; } EXPORT_SYMBOL_GPL(llist_del_first); - -/** - * llist_del_all - delete all entries from lock-less list - * @head: the head of lock-less list to delete all entries - * - * If list is empty, return NULL, otherwise, delete all entries and - * return the pointer to the first entry. The order of entries - * deleted is from the newest to the oldest added one. - */ -struct llist_node *llist_del_all(struct llist_head *head) -{ -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - - return xchg(&head->first, NULL); -} -EXPORT_SYMBOL_GPL(llist_del_all); diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c index 4689cb073da..503f087382a 100644 --- a/lib/smp_processor_id.c +++ b/lib/smp_processor_id.c @@ -22,7 +22,7 @@ notrace unsigned int debug_smp_processor_id(void) * Kernel threads bound to a single CPU can safely use * smp_processor_id(): */ - if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu))) + if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu))) goto out; /* |