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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>
This commit is contained in:
Laura Abbott 2014-10-09 15:26:38 -07:00 committed by Linus Torvalds
parent 505e3be6c0
commit 9efb3a421d
2 changed files with 32 additions and 0 deletions
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3
include/linux/genalloc.h
View File

@ -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);

29
lib/genalloc.c
View File

@ -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