percpu: add documentation on this_cpu operations
authorChristoph Lameter <cl@linux.com>
Thu, 4 Apr 2013 14:41:08 +0000 (14:41 +0000)
committerTejun Heo <tj@kernel.org>
Thu, 4 Apr 2013 17:24:53 +0000 (10:24 -0700)
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: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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