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    SubjectRe: [3/4] [PATCH]Diskdump - yet another crash dump function

    * Takao Indoh <> wrote:

    > int mod_timer(struct timer_list *timer, unsigned long expires)
    > {
    > BUG_ON(!timer->function);
    > + if (crashdump_mode()) {
    > + return diskdump_mod_timer(timer, expires);
    > + }

    looks good. Please use the proper coding style:

    + if (crashdump_mode())
    + return diskdump_mod_timer(timer, expires);

    but there's another possible method (suggested by Alan Cox) that
    requires no changes to the timer API hotpaths: 'clear' all timer lists
    upon a crash [once all CPUs have stopped and irqs are disabled] and just
    let the drivers use the normal timer APIs. Drive timer execution via a
    polling method.

    this basically approximates your polling based implementation but uses
    the existing kernel timer data structures and timer mechanism so should
    be robust and compatible. It doesnt rely on any previous state (because
    all currently pending timers are discarded) so it's as crash-safe as

    what do you think?

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      Last update: 2005-03-22 14:03    [W:0.021 / U:21.464 seconds]
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