diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 4 | ||||
| -rw-r--r-- | lib/fault-inject.c | 12 | ||||
| -rw-r--r-- | lib/stackdepot.c | 54 |
3 files changed, 40 insertions, 30 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index a9e56539bd11..e86975bfca6a 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -597,6 +597,10 @@ config ARCH_HAS_UACCESS_FLUSHCACHE config ARCH_HAS_UACCESS_MCSAFE bool +# Temporary. Goes away when all archs are cleaned up +config ARCH_STACKWALK + bool + config STACKDEPOT bool select STACKTRACE diff --git a/lib/fault-inject.c b/lib/fault-inject.c index cf7b129b0b2b..e26aa4f65eb9 100644 --- a/lib/fault-inject.c +++ b/lib/fault-inject.c @@ -65,22 +65,16 @@ static bool fail_task(struct fault_attr *attr, struct task_struct *task) static bool fail_stacktrace(struct fault_attr *attr) { - struct stack_trace trace; int depth = attr->stacktrace_depth; unsigned long entries[MAX_STACK_TRACE_DEPTH]; - int n; + int n, nr_entries; bool found = (attr->require_start == 0 && attr->require_end == ULONG_MAX); if (depth == 0) return found; - trace.nr_entries = 0; - trace.entries = entries; - trace.max_entries = depth; - trace.skip = 1; - - save_stack_trace(&trace); - for (n = 0; n < trace.nr_entries; n++) { + nr_entries = stack_trace_save(entries, depth, 1); + for (n = 0; n < nr_entries; n++) { if (attr->reject_start <= entries[n] && entries[n] < attr->reject_end) return false; diff --git a/lib/stackdepot.c b/lib/stackdepot.c index e513459a5601..605c61f65d94 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -194,40 +194,52 @@ static inline struct stack_record *find_stack(struct stack_record *bucket, return NULL; } -void depot_fetch_stack(depot_stack_handle_t handle, struct stack_trace *trace) +/** + * stack_depot_fetch - Fetch stack entries from a depot + * + * @handle: Stack depot handle which was returned from + * stack_depot_save(). + * @entries: Pointer to store the entries address + * + * Return: The number of trace entries for this depot. + */ +unsigned int stack_depot_fetch(depot_stack_handle_t handle, + unsigned long **entries) { union handle_parts parts = { .handle = handle }; void *slab = stack_slabs[parts.slabindex]; size_t offset = parts.offset << STACK_ALLOC_ALIGN; struct stack_record *stack = slab + offset; - trace->nr_entries = trace->max_entries = stack->size; - trace->entries = stack->entries; - trace->skip = 0; + *entries = stack->entries; + return stack->size; } -EXPORT_SYMBOL_GPL(depot_fetch_stack); +EXPORT_SYMBOL_GPL(stack_depot_fetch); /** - * depot_save_stack - save stack in a stack depot. - * @trace - the stacktrace to save. - * @alloc_flags - flags for allocating additional memory if required. + * stack_depot_save - Save a stack trace from an array + * + * @entries: Pointer to storage array + * @nr_entries: Size of the storage array + * @alloc_flags: Allocation gfp flags * - * Returns the handle of the stack struct stored in depot. + * Return: The handle of the stack struct stored in depot */ -depot_stack_handle_t depot_save_stack(struct stack_trace *trace, - gfp_t alloc_flags) +depot_stack_handle_t stack_depot_save(unsigned long *entries, + unsigned int nr_entries, + gfp_t alloc_flags) { - u32 hash; - depot_stack_handle_t retval = 0; struct stack_record *found = NULL, **bucket; - unsigned long flags; + depot_stack_handle_t retval = 0; struct page *page = NULL; void *prealloc = NULL; + unsigned long flags; + u32 hash; - if (unlikely(trace->nr_entries == 0)) + if (unlikely(nr_entries == 0)) goto fast_exit; - hash = hash_stack(trace->entries, trace->nr_entries); + hash = hash_stack(entries, nr_entries); bucket = &stack_table[hash & STACK_HASH_MASK]; /* @@ -235,8 +247,8 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace, * The smp_load_acquire() here pairs with smp_store_release() to * |bucket| below. */ - found = find_stack(smp_load_acquire(bucket), trace->entries, - trace->nr_entries, hash); + found = find_stack(smp_load_acquire(bucket), entries, + nr_entries, hash); if (found) goto exit; @@ -264,10 +276,10 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace, spin_lock_irqsave(&depot_lock, flags); - found = find_stack(*bucket, trace->entries, trace->nr_entries, hash); + found = find_stack(*bucket, entries, nr_entries, hash); if (!found) { struct stack_record *new = - depot_alloc_stack(trace->entries, trace->nr_entries, + depot_alloc_stack(entries, nr_entries, hash, &prealloc, alloc_flags); if (new) { new->next = *bucket; @@ -297,4 +309,4 @@ exit: fast_exit: return retval; } -EXPORT_SYMBOL_GPL(depot_save_stack); +EXPORT_SYMBOL_GPL(stack_depot_save); |