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Subject: Re: [ANNOUNCE] 3.0.1-rt8 - Regression to 3.0-rt7
From: Peter Zijlstra <peterz@infradead.org>
To: Tim Sander <tim.sander@hbm.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Paul E. McKenney" <paulmck@us.ibm.com>,
        linux-rt-users <linux-rt-users@vger.kernel.org>
Date: Thu, 11 Aug 2011 18:39:41 +0200
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On Thu, 2011-08-11 at 18:04 +0200, Tim Sander wrote:
> Yes it works for CONFIG_PREEMPT_RTB=y and as you say not for 
> CONFIG_PREEMPT_LL=y.

> +++ b/mm/filemap.c
> @@ -2040,7 +2040,7 @@ size_t iov_iter_copy_from_user_atomic(struct page *page,
>         char *kaddr;
>         size_t copied;
>  
> -       BUG_ON(!current->pagefault_disabled);
> +       BUG_ON(!(in_atomic() || current->pagefault_disabled)); 

Ah, I had hoped that bit would have cured the PREEMPT_LL=y config.


But let me untangle that posix_cpu_timer stuff first, maybe that's in
the way.