percpu: add documentation on this_cpu operations
Document the rationale and the way to use this_cpu operations. V2: Improved after feedback from Randy Dunlap v3: Further spelling fixes from Randy. Paragraphs refilled to 75 column. tj: Added .txt file extension to the document. Signed-off-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NTejun Heo <tj@kernel.org>
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Documentation/this_cpu_ops.txt
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