On Sun, Jun 14, 2015 at 5:02 PM, Ruben Safir <[email protected]> wrote: > On 06/14/2015 07:28 AM, roni wrote: >> I know i should avoid using global variables in kernel programming. >> >> What problem it create if i use more global variables? >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> [email protected] >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> > > > you step on everyone else's names space. Do you know how many other > people are collaborating with the kernel. Stick to your own back yard. > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Besides, it hampers reentrancy, unless you use locks(mutex) with each global variable. Kernel functions can be called by different processes in parallel and they might also be called/scheduled from interrupt context. _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
