BUG: commit "ARM: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW on pre-ARMv6 CPUs" breaks armv5 with CONFIG_PREEMPT

[Marc Kleine-Budde]

On 06/20/2013 01:12 PM, Catalin Marinas wrote:
> On Thu, Jun 20, 2013 at 11:28:56AM +0100, Catalin Marinas wrote:
>> We may need to place the preempt disable/enable at a higher level in the
>> scheduler. My theory is that we have a context switch from prev to next.
>> We get preempted just before finish_arch_post_lock_switch(), so the MMU
>> hasn't been switched yet. The new switch during preemption happens to a
>> thread with the same next mm, so the scheduler no longer switch_mm() and
>> the TIF_SWITCH_MM isn't set for the new thread.
>>
>> I'll come back with another patch shortly.
> 
> Here's another attempt (as before, only compile-tested):

booting kernel from /image
zImage: concatenated oftree detected
booting Linux kernel with devicetree

...dead...

Does every process have a "mm"? Even Kernel threads?

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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