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resources: Add lookup_resource()

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Add a function to find an existing resource by a resource start address.
This allows to implement simple allocators (with a malloc/free-alike API)
on top of the resource system.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2011-05-07 20:53:16 +02:00
parent 88efd0bbc0
commit 1c388919d8
2 changed files with 22 additions and 0 deletions
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1
include/linux/ioport.h
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@ -132,6 +132,7 @@ extern int allocate_resource(struct resource *root, struct resource *new,
resource_size_t,
resource_size_t),
void *alignf_data);
struct resource *lookup_resource(struct resource *root, resource_size_t start);
int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size);
resource_size_t resource_alignment(struct resource *res);