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    Subject[PATCH] kernel/exit.c - 2.4.2 - small optimalisation (very small) to do_exit()
    Date
    Hi,

    This very small patches re-orders 2 if-statements so that in the
    most common case 1 less if-statement is executed, in the worst
    case the same number of if-statements is executed (doesn't matter
    though: it's would be the fault-situation anyway).

    diff -ur --minimal linux-vanilla/kernel/exit.c linux-2.4.2/kernel/exit.c
    --- linux-vanilla/kernel/exit.c Mon Mar 26 09:28:13 2001
    +++ linux-2.4.2/kernel/exit.c Mon Mar 26 10:50:30 2001
    @@ -425,10 +425,12 @@

    if (in_interrupt())
    panic("Aiee, killing interrupt handler!");
    - if (!tsk->pid)
    - panic("Attempted to kill the idle task!");
    - if (tsk->pid == 1)
    - panic("Attempted to kill init!");
    + if (tsk->pid <= 1) {
    + if (tsk->pid)
    + panic("Attempted to kill init!");
    + else
    + panic("Attempted to kill the idle task!");
    + }
    tsk->flags |= PF_EXITING;
    del_timer_sync(&tsk->real_timer);

    Greetings,

    Folkert van Heusden (folkert@vanheusden.com)
    [ www.vanheusden.com ]

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