[PATCHv7 2/5] lib/genalloc.c: Add genpool range check function
From: Laura Abbott <hidden>
Date: 2014-08-11 23:41:34
Also in:
linux-mm, lkml
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
After allocating an address from a particular genpool, there is no good way to verify if that address actually belongs to a genpool. Introduce addr_in_gen_pool which will return if an address plus size falls completely within the genpool range. Acked-by: Will Deacon <redacted> Reviewed-by: Olof Johansson <redacted> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Laura Abbott <redacted> --- include/linux/genalloc.h | 3 +++ lib/genalloc.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 3cd0934..1ccaab4 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 c2b3ad7..c7a91cf 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c@@ -403,6 +403,35 @@ 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 *
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation