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loads/hackbench: Fix number of jobs calculation
    
    Number of hackbench jobs are calculated w.r.t. the number of CPUs the
    load is allowed to run on. When restricting such CPU mask by specifying
    a cpulist and int to str check is however wrongly performed and this
    causes the calculation to return 0 (making hackbench failing to start).
    
    Fix it by performing a conversion to string before comparing against the
    cpulist.


    loads/hackbench: Don't run on nodes with no CPUs available
    
    When cpulist is specified it might happen that some of the available
    nodes don't have cpus on which hackbench can run.
    
    Filter them out.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1571