kernel-doc: small kernel-doc optimization
Get the kernel version string only once from the environment, thus slightly speeding up kernel-doc. Signed-off-by: NBorislav Petkov <bbpetkov@yahoo.de> Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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