On Thu, Sep 21, 2017 at 10:28:11AM -0700, Tony Lindgren wrote:

* Joonsoo Kim [off-list ref] [170914 23:55]:

quoted

On Wed, Sep 13, 2017 at 09:31:27AM -0700, Tony Lindgren wrote:

quoted

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;
 }