On Mon, Dec 01, 2014 at 10:03:28AM +0100, Krzysztof Kozlowski wrote: > On pią, 2014-11-28 at 21:09 +0530, Abhilash Kesavan wrote: > > Hello Krzysztof, > > > > On Fri, Nov 28, 2014 at 8:49 PM, Krzysztof Kozlowski > > <k.kozlowski@xxxxxxxxxxx> wrote: > > > On pią, 2014-11-28 at 20:20 +0530, Abhilash Kesavan wrote: > > >> The arndale-octa board was giving "imprecise external aborts" during > > >> boot-up with MCPM enabled. CCI enablement of the boot cluster was found > > >> to be the cause of these aborts (possibly because the secure f/w was not > > >> allowing it). Hence, disable CCI for the arndale-octa board. > > >> > > >> Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> > > >> --- > > >> arch/arm/boot/dts/exynos5420-arndale-octa.dts | 4 ++++ > > >> arch/arm/boot/dts/exynos5420.dtsi | 2 +- > > >> 2 files changed, 5 insertions(+), 1 deletion(-) > > > > > > I tested these 2 patches on Arndale Octa but there are no improvements. > > > I still got imprecise aborts (some not fatal and sometimes killing init > > > with full backtrace). > > > > Thanks for testing. Are you testing this with exynos_defconfig with no > > other changes ? Can you please confirm from the bootlog that MCPM and > > CCI are not being initialized. > > > That was exynos_defconfig with disabled DRM and enabled some debug, > next-20141128. > > When I tried only exynos_defconfig (with disabled DRM) it worked fine... > So the imprecise aborts were caused by one of following debug options: > > DEBUG_SECTION_MISMATCH > DYNAMIC_DEBUG > DEBUG_ATOMIC_SLEEP > DEBUG_PREEMPT > PROVE_LOCKING > LOCKUP_DETECTOR > DEBUG_LOCK_ALLOC > PROVE_RCU > DEBUG_RT_MUTEXES > DEBUG_MUTEXES > DEBUG_SPINLOCK > DEBUG_LIST > DEBUG_PAGEALLOC > SPARSE_RCU_POINTER > DEBUG_FS > PM_DEBUG > PM_ADVANCED_DEBUG > GPIO_SYSFS > > > Can you remove these 2 patches and on linux-next check if you are > > getting aborts even with 5420_MCPM disabled. > > I tried this already and imprecise aborts shown, however with my > debugging options above. > > Overall the patches seems to work properly (although the debugging issue > needs to be resolved still), so: > > On Arndale Octa (Exynos 5420): > Tested-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Reading this message, it seems that this should *not* be given a tested-by, because it seems from what you've reported above, they don't work correctly. If you have to turn debugging options off in order to get the kernel to apparently run correctly after applying some patches, it means those patches themselves are probably buggy, rather than the debug itself being buggy. I'd suggest that you have some further work to do (a manual bisect of the config options you've disabled) to discover which is the cause of the problem. It could be that the code introduces something like a use-after-free bug. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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