Calculation of dirty_ratelimit sometimes is not correct.
E.g. initial values of dirty_ratelimit == INIT_BW and step == 0,
lead to the following result:
UBSAN: Undefined behaviour in ../mm/page-writeback.c:1286:7
shift exponent 25600 is too large for 64-bit type 'long unsigned int'
The fix
Calculation of dirty_ratelimit sometimes is not correct.
E.g. initial values of dirty_ratelimit == INIT_BW and step == 0,
lead to the following result:
UBSAN: Undefined behaviour in ../mm/page-writeback.c:1286:7
shift exponent 25600 is too large for 64-bit type 'long unsigned int'
The fix
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