about oom_kill

[Guillaume Thouvenin <guillaume.thouvenin@polymtl.ca>]

I start to read linux source and I begin with oom_kill.c file. I have two
questions about the function out_of_memory()

void out_of_memory(void)
{
        static unsigned long first, last, count, lastkill;
        unsigned long now, since;

        now = jiffies;
(1)->   since = now - last;
(2.1)-> last = now;

        /*
         * If it's been a long time since last failure,
         * we're not oom.
         */
(2.2)-> last = now;
        if (since > 5*HZ)
                goto reset;


In (1), variable "last" is used but it is not initialized. Is it an error?
In (2.1) et (2.2), the affectation is done twice, is there any reason?
 
Thanks for the help

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