bcachefs: fix ifdef for x86_64 asm

The implementation of prefetch_four_cachelines should use ifdef
CONFIG_X86_64 to conditionally compile x86_64 asm.

Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Dan Robertson 2021-07-02 21:22:06 -04:00 • committed by Kent Overstreet
commit 6f152b0f37