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Using System Calls from kernel space


Hi All ,
             I wanted to use a system call from kernel module to change the priority of the process using sys_sched_setscheduler from kernel space  after using get_fs by modifying the addr_limit of the task to KERNEL_DS using set_fs and get_fs  apis.
 
I wanted to what will be the disadvantage in using the System Calls from kernel space if  it not any file system call.
Thanks and Regards,
John Endeavour