[Linux PPC] 7.0-rc1: e500_mmu.c:923:26: error: assignment to 'struct tlbe_priv *' from incompatible pointer type 'struct tlbe_ref *'

[Christophe Leroy (CS GROUP)]

Le 23/02/2026 à 23:40, Kees Cook a écrit :
> On Mon, Feb 23, 2026 at 08:38:29PM +0100, Christophe Leroy (CS GROUP) wrote:
>>
>>
>> Le 23/02/2026 à 19:07, Christophe Leroy (CS GROUP) a écrit :
>>> +Kees
>>>
>>> Hello,
>>>
>>> Le 23/02/2026 à 17:48, Christian Zigotzky a écrit :
>>>> Hello,
>>>>
>>>> Compiling issue for e5500 machines for the RC1 of kernel 7.0:
>>>>
>>>> arch/powerpc/kvm/e500_mmu.c: In function 'kvmppc_e500_tlb_init':
>>>> arch/powerpc/kvm/e500_mmu.c:923:26: error: assignment to 'struct
>>>> tlbe_priv *' from incompatible pointer type 'struct tlbe_ref *' [-
>>>> Werror=incompatible-pointer-types]
>>>>     923 |  vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_ref,
>>>>         |                          ^
>>>> arch/powerpc/kvm/e500_mmu.c:928:26: error: assignment to 'struct
>>>> tlbe_priv *' from incompatible pointer type 'struct tlbe_ref *' [-
>>>> Werror=incompatible-pointer-types]
>>>>     928 |  vcpu_e500->gtlb_priv[1] = kzalloc_objs(struct tlbe_ref,
>>>>
>>>> Temporary solution: # CONFIG_VIRTUALIZATION is not set
>>>>
>>>> Please solve this issue.
>>>>
>>>
>>> Must be one of:
>>>
>>> 189f164e573e Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses
>>> bf4afc53b77a Convert 'alloc_obj' family to use the new default
>>> GFP_KERNEL argument
>>> 69050f8d6d07 treewide: Replace kmalloc with kmalloc_obj for non-scalar
>>> types
>>>
>>
>> Can you try following change:
>>
>> diff --git a/arch/powerpc/kvm/e500_mmu.c b/arch/powerpc/kvm/e500_mmu.c
>> index 48580c85f23b..75ed1496ead5 100644
>> --- a/arch/powerpc/kvm/e500_mmu.c
>> +++ b/arch/powerpc/kvm/e500_mmu.c
>> @@ -920,12 +920,12 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500
>> *vcpu_e500)
>>   	vcpu_e500->gtlb_offset[0] = 0;
>>   	vcpu_e500->gtlb_offset[1] = KVM_E500_TLB0_SIZE;
>>
>> -	vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_ref,
>> +	vcpu_e500->gtlb_priv[0] = kzalloc_objs(struct tlbe_priv,
>>   					       vcpu_e500->gtlb_params[0].entries);
>>   	if (!vcpu_e500->gtlb_priv[0])
>>   		goto free_vcpu;
>>
>> -	vcpu_e500->gtlb_priv[1] = kzalloc_objs(struct tlbe_ref,
>> +	vcpu_e500->gtlb_priv[1] = kzalloc_objs(struct tlbe_priv,
>>   					       vcpu_e500->gtlb_params[1].entries);
>>   	if (!vcpu_e500->gtlb_priv[1])
>>   		goto free_vcpu;
> 
> That looks like the correct fix to me. The old type was the correct size,
> but was just the wrong type. Sorry I missed it when doing my tree-wide
> multi-arch builds! What build target (or Kconfig) was needed to reach
> this code?

I used ppc64e_defconfig + CONFIG_VIRTUALIZATION=y
+ CONFIG_KVM_E500MC=y


> 
> Fixes: 69050f8d6d07 ("treewide: Replace kmalloc with kmalloc_obj for non-scalar types")
> Reviewed-by: Kees Cook <kees at kernel.org>
> 
> Thanks!
>