On Mon, 29 Oct 2007, Paul E. McKenney wrote:
> diff -urpNa -X dontdiff linux-2.6.23.1-rt4/mm/memory.c linux-2.6.23.1-rt4-fix/mm/memory.c
> --- linux-2.6.23.1-rt4/mm/memory.c 2007-10-27 22:20:57.000000000 -0700
> +++ linux-2.6.23.1-rt4-fix/mm/memory.c 2007-10-28 15:40:36.000000000 -0700
> @@ -664,6 +664,7 @@ static unsigned long zap_pte_range(struc
> int anon_rss = 0;
>
> pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
> + preempt_disable();
> arch_enter_lazy_mmu_mode();
> do {
> pte_t ptent = *pte;
> @@ -732,6 +733,7 @@ static unsigned long zap_pte_range(struc
>
> add_mm_rss(mm, file_rss, anon_rss);
> arch_leave_lazy_mmu_mode();
> + preempt_enable();
> pte_unmap_unlock(pte - 1, ptl);
>
> return addr;
I'm pulling your patch for the above added code. Took me a few hours to
find the culprit, but I was getting scheduling in atomic bugs. Turns out
that this code you put "preempt_disable" in calls sleeping spinlocks.
Might want to run with DEBUG_PREEMPT.
Thanks,
-- Steve
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