n900 in next-20170901

[Joonsoo Kim]

On Thu, Sep 21, 2017 at 10:28:11AM -0700, Tony Lindgren wrote:
> * Joonsoo Kim <iamjoonsoo.kim at lge.com> [170914 23:55]:
> > On Wed, Sep 13, 2017 at 09:31:27AM -0700, Tony Lindgren wrote:
> > > Yes I disabled CONFIG_HIGHMEM and n900 boots. To disable it,
> > > you need to remove it from arch/arm/mach-omap2/Kconfig that
> > > selects it if ARCH_OMAP2PLUS_TYPICAL is selected.
> > 
> > Okay. Problem would be related to address traslation. I'd like to
> > check address traslation more. Could you apply following patch and
> > test it? And, please send me the dmesg log and your kernel config.
> > Please test this with CONFIG_DEBUG_VIRTUAL = n and CONFIG_CMA_DEBUG=y and
> > CONFIG_HIGHMEM=y and with kernel bootparam 'ignore_loglevel'.
> > 
> > It would be really appreciate if you send me two logs for before/after
> > commit 9caf25f996e8.
> 
> Sorry for the delays, I finally got around testing this for you.

No problem! I really appreciate your help!

> Compile with your patch failed for modules with __virt_to_phys_debug
> being undefined so I added EXPORT_SYMBOL there. I also enabled DEBUG_LL
> and EARLYPRINTK to get output.
> 
> Below is dmesg output for 9caf25f996e8 + your patch. I'll send you
> the full logs separately.

Hmm...there is only one caller for the CMA memory, that is, atomic_pool_init().
Could you test one more time with 9caf25f996e8 + following patch?  I'd like to
know the actual user for the CMA memory.

Thanks.

-------------------------->8------------------------
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 519c294..c68f34a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -587,6 +587,8 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
                ptr = (void *)val;
        }
 
+       dump_stack();
+
        return ptr;
 }