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authorTejun Heo <tj@kernel.org>2009-03-06 14:33:59 +0900
committerTejun Heo <tj@kernel.org>2009-03-06 14:33:59 +0900
commitedcb463997ed7b2ffa3bac76e3e75957318f2e01 (patch)
treed1eefb78736404993b0de4a049392f9af578e29e /drivers/scsi
parent3e24aa58907c62bc79d1094e941a374568f62522 (diff)
percpu, module: implement reserved allocation and use it for module percpu variables
Impact: add reserved allocation functionality and use it for module percpu variables This patch implements reserved allocation from the first chunk. When setting up the first chunk, arch can ask to set aside certain number of bytes right after the core static area which is available only through a separate reserved allocator. This will be used primarily for module static percpu variables on architectures with limited relocation range to ensure that the module perpcu symbols are inside the relocatable range. If reserved area is requested, the first chunk becomes reserved and isn't available for regular allocation. If the first chunk also includes piggy-back dynamic allocation area, a separate chunk mapping the same region is created to serve dynamic allocation. The first one is called static first chunk and the second dynamic first chunk. Although they share the page map, their different area map initializations guarantee they serve disjoint areas according to their purposes. If arch doesn't setup reserved area, reserved allocation is handled like any other allocation. Signed-off-by: Tejun Heo <tj@kernel.org>
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