lib/test_bitmap: add tests for bitmap_{read,write}()

Add basic tests ensuring that values can be added at arbitrary positions
of the bitmap, including those spanning into the adjacent unsigned
longs.

Two new performance tests, test_bitmap_read_perf() and
test_bitmap_write_perf(), can be used to assess future performance
improvements of bitmap_read() and bitmap_write():

[    0.431119][    T1] test_bitmap: Time spent in test_bitmap_read_perf:	615253
[    0.433197][    T1] test_bitmap: Time spent in test_bitmap_write_perf:	916313

(numbers from a Intel(R) Xeon(R) Gold 6154 CPU @ 3.00GHz machine running
QEMU).

Signed-off-by: Alexander Potapenko <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Yury Norov <[email protected]>
Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Alexander Lobakin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions