Le 04/09/2025 à 10:40, Madhavan Srinivasan a écrit :
On 9/4/25 1:01 PM, Christophe Leroy wrote:
Hi Erhard,
Le 04/09/2025 à 00:44, Erhard Furtner a écrit :
Greetings!
In a conversation with Andrew about his page table check code for PowerPC he
found out there seems to be a general problem of the code patching code on ppc:
> I note that STATIC_CALL_SELFTEST seems to fail, which could be but isn't
> necessarily related.
> Specifically, it looks like code patching fails if the instruction being
patched
> is in an __init function, and in this case, that occurs due to
> page_table_check_pte_clear() being inlined into ptep_clear(), which is in
turn
> inlined into pte_clear_tests() in debug_vm_pgtable.c which is marked __init.
> Very curious!
Indeed, when I enable STATIC_CALL_SELFTEST=y on my G4 the kernel fails to boot
at an early stage, the OpenFirmware console showing only:
done
found display : /pci@f0000000/ATY,AlteracParent@10/ATY,Alterac_B@1, opening...
Without STATIC_CALL_SELFTEST the kernel boots just fine.
Kernel .config attached.
With your .config, on QEMU I get the following. I will investigate.
[ 0.000000] Kernel panic - not syncing: arch_static_call_transform: patching
failed func_a+0x0/0x10 at 0x0
[ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted
6.17.0-rc4-PMacG4+ #1628 PREEMPTLAZY
[ 0.000000] Hardware name: PowerMac3,1 7400 0xc0209 PowerMac
[ 0.000000] Call Trace:
I am using qemu with -M mac99 and it boots
Hardware name: PowerMac3,1 7400 0xc0209 PowerMac
printk: legacy bootconsole [udbg0] enabled
-----------------------------------------------------
phys_mem_size = 0x8000000
dcache_bsize = 0x20
I am missing something here. Digging some more
Did you use the .config provided by Erhard ?
Christophe
