[PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Yang Yingliang]

Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
powerpc64-linux-gnu-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
 arch/powerpc/platforms/pseries/lpar.c  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
index 0ba30b8b935b..a8e292cd88f0 100644
--- a/arch/powerpc/mm/book3s64/mmu_context.c
+++ b/arch/powerpc/mm/book3s64/mmu_context.c
@@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
 
 static int radix__init_new_context(struct mm_struct *mm)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
 	unsigned long rts_field;
 	int index, max_id;
 
@@ -177,6 +178,9 @@ static int radix__init_new_context(struct mm_struct *mm)
 	mm->context.hash_context = NULL;
 
 	return index;
+#else
+	return -ENOTSUPP;
+#endif
 }
 
 int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index baf24eacd268..e454e218dbba 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
 
 void radix_init_pseries(void)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
 	pr_info("Using radix MMU under hypervisor\n");
 
 	pseries_lpar_register_process_table(__pa(process_tb),
 						0, PRTB_SIZE_SHIFT - 12);
+#endif
 }
 
 #ifdef CONFIG_PPC_SMLPAR
-- 
2.25.1

[PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Yang Yingliang]

Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
powerpc64-linux-gnu-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
 arch/powerpc/platforms/pseries/lpar.c  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
index 0ba30b8b935b..a8e292cd88f0 100644
--- a/arch/powerpc/mm/book3s64/mmu_context.c
+++ b/arch/powerpc/mm/book3s64/mmu_context.c
@@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
 
 static int radix__init_new_context(struct mm_struct *mm)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
 	unsigned long rts_field;
 	int index, max_id;
 
@@ -177,6 +178,9 @@ static int radix__init_new_context(struct mm_struct *mm)
 	mm->context.hash_context = NULL;
 
 	return index;
+#else
+	return -ENOTSUPP;
+#endif
 }
 
 int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index baf24eacd268..e454e218dbba 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
 
 void radix_init_pseries(void)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
 	pr_info("Using radix MMU under hypervisor\n");
 
 	pseries_lpar_register_process_table(__pa(process_tb),
 						0, PRTB_SIZE_SHIFT - 12);
+#endif
 }
 
 #ifdef CONFIG_PPC_SMLPAR
-- 
2.25.1

Re: [PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Christophe Leroy]

Le 05/09/2020 à 13:25, Yang Yingliang a écrit :
> Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
> powerpc64-linux-gnu-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
>   arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++

In your commit log, you are just mentionning 
arch/powerpc/platforms/pseries/lpar.o, which is right.

You shouldn't need to modify arch/powerpc/mm/book3s64/mmu_context.c at 
all, see below.

>   arch/powerpc/platforms/pseries/lpar.c  | 2 ++
>   2 files changed, 6 insertions(+)
> 
> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
> index 0ba30b8b935b..a8e292cd88f0 100644
> --- a/arch/powerpc/mm/book3s64/mmu_context.c
> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
> @@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
>   
>   static int radix__init_new_context(struct mm_struct *mm)
>   {
> +#ifdef CONFIG_PPC_RADIX_MMU

This shouldn't be required. radix__init_new_context() is only called 
when radix_enabled() returns true.
As it is a static function, when it is not called it gets optimised 
away, so you will never get an undefined reference to `mmu_pid_bits` there.

>   	unsigned long rts_field;
>   	int index, max_id;
>   
> @@ -177,6 +178,9 @@ static int radix__init_new_context(struct mm_struct *mm)
>   	mm->context.hash_context = NULL;
>   
>   	return index;
> +#else
> +	return -ENOTSUPP;
> +#endif
>   }
>   
>   int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
> diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
> index baf24eacd268..e454e218dbba 100644
> --- a/arch/powerpc/platforms/pseries/lpar.c
> +++ b/arch/powerpc/platforms/pseries/lpar.c
> @@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
>   
>   void radix_init_pseries(void)
>   {
> +#ifdef CONFIG_PPC_RADIX_MMU

This function is only called from 
/arch/powerpc/mm/book3s64/radix_pgtable.c which is only built when 
CONFIG_PPC_RADIX_MMU is selected.

So the entire function should be encloded in the #ifdef.

>   	pr_info("Using radix MMU under hypervisor\n");
>   
>   	pseries_lpar_register_process_table(__pa(process_tb),
>   						0, PRTB_SIZE_SHIFT - 12);
> +#endif
>   }
>   
>   #ifdef CONFIG_PPC_SMLPAR
> 

Christophe

Re: [PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Christophe Leroy]

Le 05/09/2020 à 13:25, Yang Yingliang a écrit :
> Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
> powerpc64-linux-gnu-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference to `mmu_pid_bits'
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> ---
>   arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++

In your commit log, you are just mentionning 
arch/powerpc/platforms/pseries/lpar.o, which is right.

You shouldn't need to modify arch/powerpc/mm/book3s64/mmu_context.c at 
all, see below.

>   arch/powerpc/platforms/pseries/lpar.c  | 2 ++
>   2 files changed, 6 insertions(+)
> 
> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
> index 0ba30b8b935b..a8e292cd88f0 100644
> --- a/arch/powerpc/mm/book3s64/mmu_context.c
> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
> @@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
>   
>   static int radix__init_new_context(struct mm_struct *mm)
>   {
> +#ifdef CONFIG_PPC_RADIX_MMU

This shouldn't be required. radix__init_new_context() is only called 
when radix_enabled() returns true.
As it is a static function, when it is not called it gets optimised 
away, so you will never get an undefined reference to `mmu_pid_bits` there.

>   	unsigned long rts_field;
>   	int index, max_id;
>   
> @@ -177,6 +178,9 @@ static int radix__init_new_context(struct mm_struct *mm)
>   	mm->context.hash_context = NULL;
>   
>   	return index;
> +#else
> +	return -ENOTSUPP;
> +#endif
>   }
>   
>   int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
> diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
> index baf24eacd268..e454e218dbba 100644
> --- a/arch/powerpc/platforms/pseries/lpar.c
> +++ b/arch/powerpc/platforms/pseries/lpar.c
> @@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
>   
>   void radix_init_pseries(void)
>   {
> +#ifdef CONFIG_PPC_RADIX_MMU

This function is only called from 
/arch/powerpc/mm/book3s64/radix_pgtable.c which is only built when 
CONFIG_PPC_RADIX_MMU is selected.

So the entire function should be encloded in the #ifdef.

>   	pr_info("Using radix MMU under hypervisor\n");
>   
>   	pseries_lpar_register_process_table(__pa(process_tb),
>   						0, PRTB_SIZE_SHIFT - 12);
> +#endif
>   }
>   
>   #ifdef CONFIG_PPC_SMLPAR
> 

Christophe

Re: [PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Yang Yingliang]

On 2020/9/6 14:50, Christophe Leroy wrote:
>
>
> Le 05/09/2020 à 13:25, Yang Yingliang a écrit :
>> Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
>> powerpc64-linux-gnu-ld: 
>> arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference 
>> to `mmu_pid_bits'
>>
>> Reported-by: Hulk Robot <hulkci@huawei.com>
>> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
>> ---
>>   arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
>
> In your commit log, you are just mentionning 
> arch/powerpc/platforms/pseries/lpar.o, which is right.
>
> You shouldn't need to modify arch/powerpc/mm/book3s64/mmu_context.c at 
> all, see below.
>
>>   arch/powerpc/platforms/pseries/lpar.c  | 2 ++
>>   2 files changed, 6 insertions(+)
>>
>> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c 
>> b/arch/powerpc/mm/book3s64/mmu_context.c
>> index 0ba30b8b935b..a8e292cd88f0 100644
>> --- a/arch/powerpc/mm/book3s64/mmu_context.c
>> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
>> @@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
>>     static int radix__init_new_context(struct mm_struct *mm)
>>   {
>> +#ifdef CONFIG_PPC_RADIX_MMU
>
> This shouldn't be required. radix__init_new_context() is only called 
> when radix_enabled() returns true.
> As it is a static function, when it is not called it gets optimised 
> away, so you will never get an undefined reference to `mmu_pid_bits` 
> there.
powerpc64-linux-gnu-ld: 
arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x0): undefined reference 
to `mmu_pid_bits'
powerpc64-linux-gnu-ld: 
arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x8): undefined reference 
to `mmu_base_pid'


mmu_context.c is always compiled, it uses mmu_pid_bits and mmu_base_pid.

>
>>       unsigned long rts_field;
>>       int index, max_id;
>>   @@ -177,6 +178,9 @@ static int radix__init_new_context(struct 
>> mm_struct *mm)
>>       mm->context.hash_context = NULL;
>>         return index;
>> +#else
>> +    return -ENOTSUPP;
>> +#endif
>>   }
>>     int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
>> diff --git a/arch/powerpc/platforms/pseries/lpar.c 
>> b/arch/powerpc/platforms/pseries/lpar.c
>> index baf24eacd268..e454e218dbba 100644
>> --- a/arch/powerpc/platforms/pseries/lpar.c
>> +++ b/arch/powerpc/platforms/pseries/lpar.c
>> @@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
>>     void radix_init_pseries(void)
>>   {
>> +#ifdef CONFIG_PPC_RADIX_MMU
>
> This function is only called from 
> /arch/powerpc/mm/book3s64/radix_pgtable.c which is only built when 
> CONFIG_PPC_RADIX_MMU is selected.
>
> So the entire function should be encloded in the #ifdef.
OK, I will send a v2 later.
>
>>       pr_info("Using radix MMU under hypervisor\n");
>>         pseries_lpar_register_process_table(__pa(process_tb),
>>                           0, PRTB_SIZE_SHIFT - 12);
>> +#endif
>>   }
>>     #ifdef CONFIG_PPC_SMLPAR
>>
>
> Christophe
> .

Re: [PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Christophe Leroy]

Le 07/09/2020 à 03:51, Yang Yingliang a écrit :
> 
> On 2020/9/6 14:50, Christophe Leroy wrote:
>>
>>
>> Le 05/09/2020 à 13:25, Yang Yingliang a écrit :
>>> Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
>>> powerpc64-linux-gnu-ld: 
>>> arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference 
>>> to `mmu_pid_bits'
>>>
>>> Reported-by: Hulk Robot <hulkci@huawei.com>
>>> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
>>> ---
>>>   arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
>>
>> In your commit log, you are just mentionning 
>> arch/powerpc/platforms/pseries/lpar.o, which is right.
>>
>> You shouldn't need to modify arch/powerpc/mm/book3s64/mmu_context.c at 
>> all, see below.
>>
>>>   arch/powerpc/platforms/pseries/lpar.c  | 2 ++
>>>   2 files changed, 6 insertions(+)
>>>
>>> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c 
>>> b/arch/powerpc/mm/book3s64/mmu_context.c
>>> index 0ba30b8b935b..a8e292cd88f0 100644
>>> --- a/arch/powerpc/mm/book3s64/mmu_context.c
>>> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
>>> @@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
>>>     static int radix__init_new_context(struct mm_struct *mm)
>>>   {
>>> +#ifdef CONFIG_PPC_RADIX_MMU
>>
>> This shouldn't be required. radix__init_new_context() is only called 
>> when radix_enabled() returns true.
>> As it is a static function, when it is not called it gets optimised 
>> away, so you will never get an undefined reference to `mmu_pid_bits` 
>> there.
> powerpc64-linux-gnu-ld: 
> arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x0): undefined reference 
> to `mmu_pid_bits'
> powerpc64-linux-gnu-ld: 
> arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x8): undefined reference 
> to `mmu_base_pid'
> 
> 
> mmu_context.c is always compiled, it uses mmu_pid_bits and mmu_base_pid.

Yes, mmu_context.c is always compiled, but as I explained, 
radix__init_new_context() is defined as 'static' so it is optimised out 
when radix_enabled() returns false because there is no caller in that case.

I just made the test with ppc64_defconfig + CONFIG_PPC_RADIX_MMU=n (GCC 8.1)

The only failure I got was on lpar.c, which I fixed by enclosing the 
entire radix_init_pseries() in an #ifdef.

Once this is fixed, the build is OK, without any modification to 
mmu_context.c

powerpc64-linux-objdump -x arch/powerpc/mm/book3s64/mmu_context.o shows 
only the following objects in the .toc:

RELOCATION RECORDS FOR [.toc]:
OFFSET           TYPE              VALUE
0000000000000000 R_PPC64_ADDR64    kmalloc_caches
0000000000000008 R_PPC64_ADDR64    vmemmap
0000000000000010 R_PPC64_ADDR64    __pmd_frag_nr
0000000000000018 R_PPC64_ADDR64    __pmd_frag_size_shift

mmu_pid_bits and mmu_base_pid are not part of the undefined objetcs:

0000000000000000         *UND*	0000000000000000 vmemmap
0000000000000000         *UND*	0000000000000000 .mm_iommu_init
0000000000000000         *UND*	0000000000000000 __pmd_frag_nr
0000000000000000         *UND*	0000000000000000 .ida_alloc_range
0000000000000000         *UND*	0000000000000000 .slb_setup_new_exec
0000000000000000         *UND*	0000000000000000 mmu_feature_keys
0000000000000000         *UND*	0000000000000000 .memset
0000000000000000         *UND*	0000000000000000 .memcpy
0000000000000000         *UND*	0000000000000000 .slice_init_new_context_exec
0000000000000000         *UND*	0000000000000000 ._mcount
0000000000000000         *UND*	0000000000000000 .__free_pages
0000000000000000         *UND*	0000000000000000 __pmd_frag_size_shift
0000000000000000         *UND*	0000000000000000 .slice_setup_new_exec
0000000000000000         *UND*	0000000000000000 .ida_free
0000000000000000         *UND*	0000000000000000 .pte_frag_destroy
0000000000000000         *UND*	0000000000000000 .kfree
0000000000000000         *UND*	0000000000000000 .pkey_mm_init
0000000000000000         *UND*	0000000000000000 .kmem_cache_alloc_trace
0000000000000000         *UND*	0000000000000000 .__warn_printk
0000000000000000         *UND*	0000000000000000 _mcount
0000000000000000         *UND*	0000000000000000 kmalloc_caches

Christophe

Re: [PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Christophe Leroy]

Le 07/09/2020 à 03:51, Yang Yingliang a écrit :
> 
> On 2020/9/6 14:50, Christophe Leroy wrote:
>>
>>
>> Le 05/09/2020 à 13:25, Yang Yingliang a écrit :
>>> Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
>>> powerpc64-linux-gnu-ld: 
>>> arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): undefined reference 
>>> to `mmu_pid_bits'
>>>
>>> Reported-by: Hulk Robot <hulkci@huawei.com>
>>> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
>>> ---
>>>   arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
>>
>> In your commit log, you are just mentionning 
>> arch/powerpc/platforms/pseries/lpar.o, which is right.
>>
>> You shouldn't need to modify arch/powerpc/mm/book3s64/mmu_context.c at 
>> all, see below.
>>
>>>   arch/powerpc/platforms/pseries/lpar.c  | 2 ++
>>>   2 files changed, 6 insertions(+)
>>>
>>> diff --git a/arch/powerpc/mm/book3s64/mmu_context.c 
>>> b/arch/powerpc/mm/book3s64/mmu_context.c
>>> index 0ba30b8b935b..a8e292cd88f0 100644
>>> --- a/arch/powerpc/mm/book3s64/mmu_context.c
>>> +++ b/arch/powerpc/mm/book3s64/mmu_context.c
>>> @@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
>>>     static int radix__init_new_context(struct mm_struct *mm)
>>>   {
>>> +#ifdef CONFIG_PPC_RADIX_MMU
>>
>> This shouldn't be required. radix__init_new_context() is only called 
>> when radix_enabled() returns true.
>> As it is a static function, when it is not called it gets optimised 
>> away, so you will never get an undefined reference to `mmu_pid_bits` 
>> there.
> powerpc64-linux-gnu-ld: 
> arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x0): undefined reference 
> to `mmu_pid_bits'
> powerpc64-linux-gnu-ld: 
> arch/powerpc/mm/book3s64/mmu_context.o:(.toc+0x8): undefined reference 
> to `mmu_base_pid'
> 
> 
> mmu_context.c is always compiled, it uses mmu_pid_bits and mmu_base_pid.

Yes, mmu_context.c is always compiled, but as I explained, 
radix__init_new_context() is defined as 'static' so it is optimised out 
when radix_enabled() returns false because there is no caller in that case.

I just made the test with ppc64_defconfig + CONFIG_PPC_RADIX_MMU=n (GCC 8.1)

The only failure I got was on lpar.c, which I fixed by enclosing the 
entire radix_init_pseries() in an #ifdef.

Once this is fixed, the build is OK, without any modification to 
mmu_context.c

powerpc64-linux-objdump -x arch/powerpc/mm/book3s64/mmu_context.o shows 
only the following objects in the .toc:

RELOCATION RECORDS FOR [.toc]:
OFFSET           TYPE              VALUE
0000000000000000 R_PPC64_ADDR64    kmalloc_caches
0000000000000008 R_PPC64_ADDR64    vmemmap
0000000000000010 R_PPC64_ADDR64    __pmd_frag_nr
0000000000000018 R_PPC64_ADDR64    __pmd_frag_size_shift

mmu_pid_bits and mmu_base_pid are not part of the undefined objetcs:

0000000000000000         *UND*	0000000000000000 vmemmap
0000000000000000         *UND*	0000000000000000 .mm_iommu_init
0000000000000000         *UND*	0000000000000000 __pmd_frag_nr
0000000000000000         *UND*	0000000000000000 .ida_alloc_range
0000000000000000         *UND*	0000000000000000 .slb_setup_new_exec
0000000000000000         *UND*	0000000000000000 mmu_feature_keys
0000000000000000         *UND*	0000000000000000 .memset
0000000000000000         *UND*	0000000000000000 .memcpy
0000000000000000         *UND*	0000000000000000 .slice_init_new_context_exec
0000000000000000         *UND*	0000000000000000 ._mcount
0000000000000000         *UND*	0000000000000000 .__free_pages
0000000000000000         *UND*	0000000000000000 __pmd_frag_size_shift
0000000000000000         *UND*	0000000000000000 .slice_setup_new_exec
0000000000000000         *UND*	0000000000000000 .ida_free
0000000000000000         *UND*	0000000000000000 .pte_frag_destroy
0000000000000000         *UND*	0000000000000000 .kfree
0000000000000000         *UND*	0000000000000000 .pkey_mm_init
0000000000000000         *UND*	0000000000000000 .kmem_cache_alloc_trace
0000000000000000         *UND*	0000000000000000 .__warn_printk
0000000000000000         *UND*	0000000000000000 _mcount
0000000000000000         *UND*	0000000000000000 kmalloc_caches

Christophe