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

Hi Marc,

On Thu, Jun 20, 2013 at 09:43:33AM +0100, Marc Kleine-Budde wrote:

The problem can be reproduced on several mx28 and an at91sam9263 and
only occurs of CONFIG_PREEMPT (Preemptible Kernel (Low-Latency Desktop))
is enabled.

I have the gut feeling that the "if (irqs_disabled())" check in the
above patch is not correct for CONFIG_PREEMPT.

Marc

[1] The test program creating 150 threads in a row crashes like this:

quoted

[8]+  Segmentation fault         ./thread_test_c
[5]   Illegal instruction        ./thread_test_c
[4]   Illegal instruction        ./thread_test_c
[2]   Segmentation fault         ./thread_test_c
[3]   Illegal instruction        ./thread_test_c
[1]   Segmentation fault         ./thread_test_c

Any chance you can make your test available somewhere please? I remember
testing on a 926 when the patch was written, so it could be a bad
interaction with some later changes.

Cheers,

Will