Build warning in todays linus/master

[will.deacon@arm.com (Will Deacon)]

Hi Jamie,

> I'm getting a build warning on todays master build for my V6K platform:
> 
>   CC      arch/arm/mm/mmu.o
> arch/arm/mm/mmu.c: In function 'create_36bit_mapping':
> arch/arm/mm/mmu.c:601:10: warning: format '%08llx' expects type 'long long unsigned int', but argument
> 2 has type 'unsigned int'
> arch/arm/mm/mmu.c:614:10: warning: format '%08llx' expects type 'long long unsigned int', but argument
> 2 has type 'unsigned int'
> arch/arm/mm/mmu.c:621:10: warning: format '%08llx' expects type 'long long unsigned int', but argument
> 2 has type 'unsigned int'
> arch/arm/mm/mmu.c: In function 'create_mapping':
> arch/arm/mm/mmu.c:662:10: warning: format '%08llx' expects type 'long long unsigned int', but argument
> 2 has type 'unsigned int'
> arch/arm/mm/mmu.c:670:10: warning: format '%08llx' expects type 'long long unsigned int', but argument
> 2 has type 'unsigned int'
> arch/arm/mm/mmu.c:690:10: warning: format '%08lx' expects type 'long unsigned int', but argument 2 has
> type 'unsigned int'
> 
> Which is introduced by (3a6b16 [ARM: 6675/1: use phys_addr_t instead of
> unsigned long in conversion code]), because phys_addr_t is a u32
> (!CONFIG_PHYS_ADDR_T_64BIT).  I guess a cast to u64 in the printk()'s in
> arch/arm/mm/mmu.c would fix these up, is that the right approach?

It looks like one of the LPAE preparation patches has been merged
(i.e. the one which replaces unsigned long with phys_addr_t) but the
conversion specifier fixes are not yet in mainline, although they do
live in -next.

It's unfortunate that this generates warnings but I don't think you
can avoid the ordering requirements of these patches.

For now, you could try cherry-picking the rest of that patch series
from -next:

ad6b9c9 ARM: 6671/1: LPAE: use phys_addr_t instead of unsigned long in outercache functions
cae6292 ARM: 6672/1: LPAE: use phys_addr_t instead of unsigned long in mapping functions
f60892d ARM: 6673/1: LPAE: use phys_addr_t instead of unsigned long for start of membanks
29a3819 ARM: 6674/1: LPAE: use long long format when printing physical addresses and ptes

These are all in Russell's -devel branch so hopefully they'll find their
way upstream soon.

Thanks for spotting this,

Will