Hi,

       I'm not skilled with MM at all, so sorry if I'm saying something
stupid.

When compiling Linux (latest kernel from Linus' git) on ARM, I noticed 
the following warning:

CC      arch/arm/mm/ioremap.o
arch/arm/mm/ioremap.c: In function '__arm_ioremap_pfn':
arch/arm/mm/ioremap.c:83: warning: control may reach end of non-void
function 'remap_area_pte' being inlined

According to the message in the printk, we go to "bad" when the page
already exists.

So, I'm wondering if we shouldn't return a -EEXIST (see the patch
attached). This would remove that annoying warning message during
compilation...

Is it a good/bad idea ?

Regards,

              Claudio