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__kmap_atomic_idx is per_cpu variable. Each CPU can use KM_TYPE_NR
entries from FIXMAP i.e. from 0 to KM_TYPE_NR - 1. Allowing
__kmap_atomic_idx to over- shoot to KM_TYPE_NR can mess up with next
CPU's 0th entry which is a bug. Hence BUG_ON if __kmap_atomic_idx >=
KM_TYPE_NR.
Fix the off-by-on in this test.
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1d352bfd41