Fail to boot 5.15 on mpc8347 with either debug_pagealloc or nobats

[Christophe Leroy]

Le 05/12/2021 à 17:42, Maxime Bizon a écrit :
> 
> 
> On Saturday 04 Dec 2021 à 17:42:44 (+0000), Christophe Leroy wrote:
> 
> Also when mem=2G, I have physical memory mapped twice:
> 
> CONFIG_PAGE_OFFSET=0x80000000
> CONFIG_LOWMEM_SIZE=0x60000000
> 
> 0: 0x80000000-0x8fffffff 0x00000000       256M Kernel rw      m
> 1: 0x90000000-0x9fffffff 0x10000000       256M Kernel rw      m
> 2: 0xa0000000-0xafffffff 0x20000000       256M Kernel rw      m
> 3: 0xb0000000-0xbfffffff 0x30000000       256M Kernel rw      m
> 4: 0xc0000000-0xcfffffff 0x40000000       256M Kernel rw      m
> 5: 0xd0000000-0xdfffffff 0x50000000       256M Kernel rw      m
> 6: 0xf0000000-0xf7ffffff 0x50000000       128M Kernel rw      m
> 
> BAT5 comes from __mmu_mapin_ram(), BAT6 from kasan init
> 
> Is BAT5 needed here ?

Did you check with my latest patch (v2) ?

It should now allocate a block outside lowmem, most likely 0x78000000.

Christophe