-0700

x86_64: Rename CF Makefile variable in vdso

This avoids a conflict with sparse builds.

Reported by Alexey Dobriyan, fix suggested by Al Viro

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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