The resource system is a nice existing subsystem to implement simple allocators
on top of.
Unfortunately, there's no official method to find an existing resource by a
resource start address, which is needed for a freeing function that just takes
the start address of the region to free.
Currently there are 3 users of the resource subsystem that implement this by
traversing the resource tree theirselves:
- The Amiga Chip RAM allocator on m68k,
- iomap()/iounmap() on sparc,
- DMA allocation API on sparc.
They all lack locking of the resource tree, as resource_lock is static in
kernel/resource.c.
Hence this patchset adds lookup_resource() and converts the above users to it.
[1/4] sparc: _sparc_find_resource() should check for exact matches
[2/4] resources: Add lookup_resource()
[3/4] m68k/amiga: Chip RAM - Use lookup_resource()
[4/4] sparc: iounmap() and *_free_coherent() - Use lookup_resource()
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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