Re: [RFC] mmiotrace full patch, preview 2

[Vegard Nossum]

Hi,

I may of course be wrong, but... Shouldn't the post_kmmio_handler(),
called from the die notifier chain, check for the DR_STEP condition?
This makes sure that the function is not called in the cases where the
source of the debug exception was not a single-stepping event. Though
I guess you'll also have other checks in place to notice that the
interrupt was not the one you were expecting. I guess a little extra
safety won't hurt though?

On Sun, Mar 9, 2008 at 3:40 PM, Pekka Paalanen <pq@xxxxxx> wrote:
>  +/*
>  + * Interrupts are disabled on entry as trap1 is an interrupt gate
>  + * and they remain disabled thorough out this function.
>  + * This must always get called as the pair to kmmio_handler().
>  + */
>  +static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
>  +{
>  +       int ret = 0;
>  +       struct kmmio_context *ctx = &get_cpu_var(kmmio_ctx);

if (!(condition & DR_STEP))
    return;


Vegard
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/