diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index 3cd0934d62ba3496d7c5e73beb00dd059db6539d..1ccaab44abcc80541a1aebc024b62e650cb3982c 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -121,6 +121,9 @@ extern struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order, int nid); extern struct gen_pool *dev_get_gen_pool(struct device *dev); +bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start, + size_t size); + #ifdef CONFIG_OF extern struct gen_pool *of_get_named_gen_pool(struct device_node *np, const char *propname, int index); diff --git a/lib/genalloc.c b/lib/genalloc.c index 166f17b9f1691290649ec7bebc4152cc3e971ad1..cce4dd68c40da211948177f6903917d4ac81b176 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -402,6 +402,35 @@ void gen_pool_for_each_chunk(struct gen_pool *pool, } EXPORT_SYMBOL(gen_pool_for_each_chunk); +/** + * addr_in_gen_pool - checks if an address falls within the range of a pool + * @pool: the generic memory pool + * @start: start address + * @size: size of the region + * + * Check if the range of addresses falls within the specified pool. Returns + * true if the entire range is contained in the pool and false otherwise. + */ +bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start, + size_t size) +{ + bool found = false; + unsigned long end = start + size; + struct gen_pool_chunk *chunk; + + rcu_read_lock(); + list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) { + if (start >= chunk->start_addr && start <= chunk->end_addr) { + if (end <= chunk->end_addr) { + found = true; + break; + } + } + } + rcu_read_unlock(); + return found; +} + /** * gen_pool_avail - get available free space of the pool * @pool: pool to get available free space