Global variables

[AYAN KUMAR HALDER]

On Sun, Jun 14, 2015 at 5:02 PM, Ruben Safir <ruben at mrbrklyn.com> 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?
>>
>>
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>
>
> 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.
>
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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.