include/linux/cache.h: expand documentation over __read_mostly

__read_mostly can easily be misused by folks, its not meant for just
read-only data.  There are performance reasons for using it, but we also
don't provide any guidance about its use.  Provide a bit more guidance
over its use.

Signed-off-by: Luis Chamberlain <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Acked-by: Rafael Aquini <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

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