diff options
author | Laura Abbott <lauraa@codeaurora.org> | 2014-10-09 15:26:38 -0700 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2015-01-22 21:51:40 +0000 |
commit | e4d45c70b7bad66ada07b19edcc1ffa692c1845b (patch) | |
tree | 5add264a403e92ea90a1e56c9f793ace99bba681 /lib | |
parent | b4382e715d6240e460c29a730c5fe9740aea68e5 (diff) |
lib/genalloc.c: add genpool range check function
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.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Olof Johansson <olof@lixom.net>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Riley <davidriley@chromium.org>
Cc: Ritesh Harjain <ritesh.harjani@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 9efb3a421d55d30b65fb0dbee05108d15c6c55f7)
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/genalloc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c index 095b8f9b1a50..f8b131bd920e 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -369,6 +369,35 @@ 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 * |