We can now safely iterate over all pages in a folio, so no need for the
pfn_to_page().

Also, as we already force the refcount in __init_single_page() to 1,
we can just set the refcount to 0 and avoid page_ref_freeze() +
VM_BUG_ON. Likely, in the future, we would just want to tell
__init_single_page() to which value to initialize the refcount.

Further, adjust the comments to highlight that we are dealing with an
open-coded prep_compound_page() variant, and add another comment explaining
why we really need the __init_single_page() only on the tail pages.

Note that the current code was likely problematic, but we never ran into
it: prep_compound_tail() would have been called with an offset that might
exceed a memory section, and prep_compound_tail() would have simply
added that offset to the page pointer -- which would not have done the
right thing on sparsemem without vmemmap.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 mm/hugetlb.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4a97e4f14c0dc..1f42186a85ea4 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
 {
 	enum zone_type zone = zone_idx(folio_zone(folio));
 	int nid = folio_nid(folio);
+	struct page *page = folio_page(folio, start_page_number);
 	unsigned long head_pfn = folio_pfn(folio);
 	unsigned long pfn, end_pfn = head_pfn + end_page_number;
-	int ret;
-
-	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
-		struct page *page = pfn_to_page(pfn);
 
+	/*
+	 * We mark all tail pages with memblock_reserved_mark_noinit(),
+	 * so these pages are completely uninitialized.
+	 */
+	for (pfn = head_pfn + start_page_number; pfn < end_pfn; page++, pfn++) {
 		__init_single_page(page, pfn, zone, nid);
 		prep_compound_tail((struct page *)folio, pfn - head_pfn);
-		ret = page_ref_freeze(page, 1);
-		VM_BUG_ON(!ret);
+		set_page_count(page, 0);
 	}
 }
 
@@ -3257,12 +3258,15 @@ static void __init hugetlb_folio_init_vmemmap(struct folio *folio,
 {
 	int ret;
 
-	/* Prepare folio head */
+	/*
+	 * This is an open-coded prep_compound_page() whereby we avoid
+	 * walking pages twice by initializing/preparing+freezing them in the
+	 * same go.
+	 */
 	__folio_clear_reserved(folio);
 	__folio_set_head(folio);
 	ret = folio_ref_freeze(folio, 1);
 	VM_BUG_ON(!ret);
-	/* Initialize the necessary tail struct pages */
 	hugetlb_folio_init_tail_vmemmap(folio, 1, nr_pages);
 	prep_compound_head((struct page *)folio, huge_page_order(h));
 }
-- 
2.50.1

* David Hildenbrand <david@redhat.com> [250827 18:06]:
> We can now safely iterate over all pages in a folio, so no need for the
> pfn_to_page().
> 
> Also, as we already force the refcount in __init_single_page() to 1,
> we can just set the refcount to 0 and avoid page_ref_freeze() +
> VM_BUG_ON. Likely, in the future, we would just want to tell
> __init_single_page() to which value to initialize the refcount.
> 
> Further, adjust the comments to highlight that we are dealing with an
> open-coded prep_compound_page() variant, and add another comment explaining
> why we really need the __init_single_page() only on the tail pages.
> 
> Note that the current code was likely problematic, but we never ran into
> it: prep_compound_tail() would have been called with an offset that might
> exceed a memory section, and prep_compound_tail() would have simply
> added that offset to the page pointer -- which would not have done the
> right thing on sparsemem without vmemmap.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>

Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>

> ---
>  mm/hugetlb.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 4a97e4f14c0dc..1f42186a85ea4 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
>  {
>  	enum zone_type zone = zone_idx(folio_zone(folio));
>  	int nid = folio_nid(folio);
> +	struct page *page = folio_page(folio, start_page_number);
>  	unsigned long head_pfn = folio_pfn(folio);
>  	unsigned long pfn, end_pfn = head_pfn + end_page_number;
> -	int ret;
> -
> -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
> -		struct page *page = pfn_to_page(pfn);
>  
> +	/*
> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
> +	 * so these pages are completely uninitialized.
> +	 */
> +	for (pfn = head_pfn + start_page_number; pfn < end_pfn; page++, pfn++) {
>  		__init_single_page(page, pfn, zone, nid);
>  		prep_compound_tail((struct page *)folio, pfn - head_pfn);
> -		ret = page_ref_freeze(page, 1);
> -		VM_BUG_ON(!ret);
> +		set_page_count(page, 0);
>  	}
>  }
>  
> @@ -3257,12 +3258,15 @@ static void __init hugetlb_folio_init_vmemmap(struct folio *folio,
>  {
>  	int ret;
>  
> -	/* Prepare folio head */
> +	/*
> +	 * This is an open-coded prep_compound_page() whereby we avoid
> +	 * walking pages twice by initializing/preparing+freezing them in the
> +	 * same go.
> +	 */
>  	__folio_clear_reserved(folio);
>  	__folio_set_head(folio);
>  	ret = folio_ref_freeze(folio, 1);
>  	VM_BUG_ON(!ret);
> -	/* Initialize the necessary tail struct pages */
>  	hugetlb_folio_init_tail_vmemmap(folio, 1, nr_pages);
>  	prep_compound_head((struct page *)folio, huge_page_order(h));
>  }
> -- 
> 2.50.1
>

On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
> We can now safely iterate over all pages in a folio, so no need for the
> pfn_to_page().
>
> Also, as we already force the refcount in __init_single_page() to 1,

Mega huge nit (ignore if you want), but maybe worth saying 'via
init_page_count()'.

> we can just set the refcount to 0 and avoid page_ref_freeze() +
> VM_BUG_ON. Likely, in the future, we would just want to tell
> __init_single_page() to which value to initialize the refcount.

Right yes :)

>
> Further, adjust the comments to highlight that we are dealing with an
> open-coded prep_compound_page() variant, and add another comment explaining
> why we really need the __init_single_page() only on the tail pages.

Ah nice another 'anchor' to grep for!

>
> Note that the current code was likely problematic, but we never ran into
> it: prep_compound_tail() would have been called with an offset that might
> exceed a memory section, and prep_compound_tail() would have simply
> added that offset to the page pointer -- which would not have done the
> right thing on sparsemem without vmemmap.
>
> Signed-off-by: David Hildenbrand <david@redhat.com>

LGTM, so:

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>

> ---
>  mm/hugetlb.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 4a97e4f14c0dc..1f42186a85ea4 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
>  {
>  	enum zone_type zone = zone_idx(folio_zone(folio));
>  	int nid = folio_nid(folio);
> +	struct page *page = folio_page(folio, start_page_number);
>  	unsigned long head_pfn = folio_pfn(folio);
>  	unsigned long pfn, end_pfn = head_pfn + end_page_number;
> -	int ret;
> -
> -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
> -		struct page *page = pfn_to_page(pfn);
>
> +	/*
> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
> +	 * so these pages are completely uninitialized.
> +	 */
> +	for (pfn = head_pfn + start_page_number; pfn < end_pfn; page++, pfn++) {
>  		__init_single_page(page, pfn, zone, nid);
>  		prep_compound_tail((struct page *)folio, pfn - head_pfn);
> -		ret = page_ref_freeze(page, 1);
> -		VM_BUG_ON(!ret);
> +		set_page_count(page, 0);
>  	}
>  }
>
> @@ -3257,12 +3258,15 @@ static void __init hugetlb_folio_init_vmemmap(struct folio *folio,
>  {
>  	int ret;
>
> -	/* Prepare folio head */
> +	/*
> +	 * This is an open-coded prep_compound_page() whereby we avoid
> +	 * walking pages twice by initializing/preparing+freezing them in the
> +	 * same go.
> +	 */
>  	__folio_clear_reserved(folio);
>  	__folio_set_head(folio);
>  	ret = folio_ref_freeze(folio, 1);
>  	VM_BUG_ON(!ret);
> -	/* Initialize the necessary tail struct pages */
>  	hugetlb_folio_init_tail_vmemmap(folio, 1, nr_pages);
>  	prep_compound_head((struct page *)folio, huge_page_order(h));
>  }
> --
> 2.50.1
>

On 28.08.25 17:37, Lorenzo Stoakes wrote:
> On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
>> We can now safely iterate over all pages in a folio, so no need for the
>> pfn_to_page().
>>
>> Also, as we already force the refcount in __init_single_page() to 1,
> 
> Mega huge nit (ignore if you want), but maybe worth saying 'via
> init_page_count()'.

Will add, thanks!

-- 
Cheers

David / dhildenb

On Fri, Aug 29, 2025 at 01:59:19PM +0200, David Hildenbrand wrote:
> On 28.08.25 17:37, Lorenzo Stoakes wrote:
> > On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
> > > We can now safely iterate over all pages in a folio, so no need for the
> > > pfn_to_page().
> > >
> > > Also, as we already force the refcount in __init_single_page() to 1,
> >
> > Mega huge nit (ignore if you want), but maybe worth saying 'via
> > init_page_count()'.
>
> Will add, thanks!

Thanks!

>
> --
> Cheers
>
> David / dhildenb
>
>

On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
> We can now safely iterate over all pages in a folio, so no need for the
> pfn_to_page().
> 
> Also, as we already force the refcount in __init_single_page() to 1,
> we can just set the refcount to 0 and avoid page_ref_freeze() +
> VM_BUG_ON. Likely, in the future, we would just want to tell
> __init_single_page() to which value to initialize the refcount.
> 
> Further, adjust the comments to highlight that we are dealing with an
> open-coded prep_compound_page() variant, and add another comment explaining
> why we really need the __init_single_page() only on the tail pages.
> 
> Note that the current code was likely problematic, but we never ran into
> it: prep_compound_tail() would have been called with an offset that might
> exceed a memory section, and prep_compound_tail() would have simply
> added that offset to the page pointer -- which would not have done the
> right thing on sparsemem without vmemmap.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  mm/hugetlb.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 4a97e4f14c0dc..1f42186a85ea4 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
>  {
>  	enum zone_type zone = zone_idx(folio_zone(folio));
>  	int nid = folio_nid(folio);
> +	struct page *page = folio_page(folio, start_page_number);
>  	unsigned long head_pfn = folio_pfn(folio);
>  	unsigned long pfn, end_pfn = head_pfn + end_page_number;
> -	int ret;
> -
> -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
> -		struct page *page = pfn_to_page(pfn);
>  
> +	/*
> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
> +	 * so these pages are completely uninitialized.

                             ^ not? ;-)

> +	 */
> +	for (pfn = head_pfn + start_page_number; pfn < end_pfn; page++, pfn++) {
>  		__init_single_page(page, pfn, zone, nid);
>  		prep_compound_tail((struct page *)folio, pfn - head_pfn);
> -		ret = page_ref_freeze(page, 1);
> -		VM_BUG_ON(!ret);
> +		set_page_count(page, 0);
>  	}
>  }
>  
> @@ -3257,12 +3258,15 @@ static void __init hugetlb_folio_init_vmemmap(struct folio *folio,
>  {
>  	int ret;
>  
> -	/* Prepare folio head */
> +	/*
> +	 * This is an open-coded prep_compound_page() whereby we avoid
> +	 * walking pages twice by initializing/preparing+freezing them in the
> +	 * same go.
> +	 */
>  	__folio_clear_reserved(folio);
>  	__folio_set_head(folio);
>  	ret = folio_ref_freeze(folio, 1);
>  	VM_BUG_ON(!ret);
> -	/* Initialize the necessary tail struct pages */
>  	hugetlb_folio_init_tail_vmemmap(folio, 1, nr_pages);
>  	prep_compound_head((struct page *)folio, huge_page_order(h));
>  }
> -- 
> 2.50.1
> 

-- 
Sincerely yours,
Mike.

On 28.08.25 09:21, Mike Rapoport wrote:
> On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
>> We can now safely iterate over all pages in a folio, so no need for the
>> pfn_to_page().
>>
>> Also, as we already force the refcount in __init_single_page() to 1,
>> we can just set the refcount to 0 and avoid page_ref_freeze() +
>> VM_BUG_ON. Likely, in the future, we would just want to tell
>> __init_single_page() to which value to initialize the refcount.
>>
>> Further, adjust the comments to highlight that we are dealing with an
>> open-coded prep_compound_page() variant, and add another comment explaining
>> why we really need the __init_single_page() only on the tail pages.
>>
>> Note that the current code was likely problematic, but we never ran into
>> it: prep_compound_tail() would have been called with an offset that might
>> exceed a memory section, and prep_compound_tail() would have simply
>> added that offset to the page pointer -- which would not have done the
>> right thing on sparsemem without vmemmap.
>>
>> Signed-off-by: David Hildenbrand <david@redhat.com>
>> ---
>>   mm/hugetlb.c | 20 ++++++++++++--------
>>   1 file changed, 12 insertions(+), 8 deletions(-)
>>
>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
>> index 4a97e4f14c0dc..1f42186a85ea4 100644
>> --- a/mm/hugetlb.c
>> +++ b/mm/hugetlb.c
>> @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
>>   {
>>   	enum zone_type zone = zone_idx(folio_zone(folio));
>>   	int nid = folio_nid(folio);
>> +	struct page *page = folio_page(folio, start_page_number);
>>   	unsigned long head_pfn = folio_pfn(folio);
>>   	unsigned long pfn, end_pfn = head_pfn + end_page_number;
>> -	int ret;
>> -
>> -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
>> -		struct page *page = pfn_to_page(pfn);
>>   
>> +	/*
>> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
>> +	 * so these pages are completely uninitialized.
> 
>                               ^ not? ;-)

Can you elaborate?

-- 
Cheers

David / dhildenb

On Thu, Aug 28, 2025 at 09:44:27AM +0200, David Hildenbrand wrote:
> On 28.08.25 09:21, Mike Rapoport wrote:
> > On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
> > > We can now safely iterate over all pages in a folio, so no need for the
> > > pfn_to_page().
> > > 
> > > Also, as we already force the refcount in __init_single_page() to 1,
> > > we can just set the refcount to 0 and avoid page_ref_freeze() +
> > > VM_BUG_ON. Likely, in the future, we would just want to tell
> > > __init_single_page() to which value to initialize the refcount.
> > > 
> > > Further, adjust the comments to highlight that we are dealing with an
> > > open-coded prep_compound_page() variant, and add another comment explaining
> > > why we really need the __init_single_page() only on the tail pages.
> > > 
> > > Note that the current code was likely problematic, but we never ran into
> > > it: prep_compound_tail() would have been called with an offset that might
> > > exceed a memory section, and prep_compound_tail() would have simply
> > > added that offset to the page pointer -- which would not have done the
> > > right thing on sparsemem without vmemmap.
> > > 
> > > Signed-off-by: David Hildenbrand <david@redhat.com>
> > > ---
> > >   mm/hugetlb.c | 20 ++++++++++++--------
> > >   1 file changed, 12 insertions(+), 8 deletions(-)
> > > 
> > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > > index 4a97e4f14c0dc..1f42186a85ea4 100644
> > > --- a/mm/hugetlb.c
> > > +++ b/mm/hugetlb.c
> > > @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
> > >   {
> > >   	enum zone_type zone = zone_idx(folio_zone(folio));
> > >   	int nid = folio_nid(folio);
> > > +	struct page *page = folio_page(folio, start_page_number);
> > >   	unsigned long head_pfn = folio_pfn(folio);
> > >   	unsigned long pfn, end_pfn = head_pfn + end_page_number;
> > > -	int ret;
> > > -
> > > -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
> > > -		struct page *page = pfn_to_page(pfn);
> > > +	/*
> > > +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
> > > +	 * so these pages are completely uninitialized.
> > 
> >                               ^ not? ;-)
> 
> Can you elaborate?

Oh, sorry, I misread "uninitialized".
Still, I'd phrase it as 

	/*
	 * We marked all tail pages with memblock_reserved_mark_noinit(),
	 * so we must initialize them here.
	 */

> -- 
> Cheers
> 
> David / dhildenb
> 

-- 
Sincerely yours,
Mike.

On 28.08.25 10:06, Mike Rapoport wrote:
> On Thu, Aug 28, 2025 at 09:44:27AM +0200, David Hildenbrand wrote:
>> On 28.08.25 09:21, Mike Rapoport wrote:
>>> On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
>>>> We can now safely iterate over all pages in a folio, so no need for the
>>>> pfn_to_page().
>>>>
>>>> Also, as we already force the refcount in __init_single_page() to 1,
>>>> we can just set the refcount to 0 and avoid page_ref_freeze() +
>>>> VM_BUG_ON. Likely, in the future, we would just want to tell
>>>> __init_single_page() to which value to initialize the refcount.
>>>>
>>>> Further, adjust the comments to highlight that we are dealing with an
>>>> open-coded prep_compound_page() variant, and add another comment explaining
>>>> why we really need the __init_single_page() only on the tail pages.
>>>>
>>>> Note that the current code was likely problematic, but we never ran into
>>>> it: prep_compound_tail() would have been called with an offset that might
>>>> exceed a memory section, and prep_compound_tail() would have simply
>>>> added that offset to the page pointer -- which would not have done the
>>>> right thing on sparsemem without vmemmap.
>>>>
>>>> Signed-off-by: David Hildenbrand <david@redhat.com>
>>>> ---
>>>>    mm/hugetlb.c | 20 ++++++++++++--------
>>>>    1 file changed, 12 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
>>>> index 4a97e4f14c0dc..1f42186a85ea4 100644
>>>> --- a/mm/hugetlb.c
>>>> +++ b/mm/hugetlb.c
>>>> @@ -3237,17 +3237,18 @@ static void __init hugetlb_folio_init_tail_vmemmap(struct folio *folio,
>>>>    {
>>>>    	enum zone_type zone = zone_idx(folio_zone(folio));
>>>>    	int nid = folio_nid(folio);
>>>> +	struct page *page = folio_page(folio, start_page_number);
>>>>    	unsigned long head_pfn = folio_pfn(folio);
>>>>    	unsigned long pfn, end_pfn = head_pfn + end_page_number;
>>>> -	int ret;
>>>> -
>>>> -	for (pfn = head_pfn + start_page_number; pfn < end_pfn; pfn++) {
>>>> -		struct page *page = pfn_to_page(pfn);
>>>> +	/*
>>>> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
>>>> +	 * so these pages are completely uninitialized.
>>>
>>>                                ^ not? ;-)
>>
>> Can you elaborate?
> 
> Oh, sorry, I misread "uninitialized".
> Still, I'd phrase it as
> 
> 	/*
> 	 * We marked all tail pages with memblock_reserved_mark_noinit(),
> 	 * so we must initialize them here.
> 	 */

I prefer what I currently have, but thanks for the review.

-- 
Cheers

David / dhildenb

On Thu, Aug 28, 2025 at 10:18:23AM +0200, David Hildenbrand wrote:
> On 28.08.25 10:06, Mike Rapoport wrote:
> > On Thu, Aug 28, 2025 at 09:44:27AM +0200, David Hildenbrand wrote:
> > > On 28.08.25 09:21, Mike Rapoport wrote:
> > > > On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
> > > > > +	/*
> > > > > +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
> > > > > +	 * so these pages are completely uninitialized.
> > > > 
> > > >                                ^ not? ;-)
> > > 
> > > Can you elaborate?
> > 
> > Oh, sorry, I misread "uninitialized".
> > Still, I'd phrase it as
> > 
> > 	/*
> > 	 * We marked all tail pages with memblock_reserved_mark_noinit(),
> > 	 * so we must initialize them here.
> > 	 */
> 
> I prefer what I currently have, but thanks for the review.

No strong feelings, feel free to add

Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

-- 
Sincerely yours,
Mike.

On 28.08.25 10:37, Mike Rapoport wrote:
> On Thu, Aug 28, 2025 at 10:18:23AM +0200, David Hildenbrand wrote:
>> On 28.08.25 10:06, Mike Rapoport wrote:
>>> On Thu, Aug 28, 2025 at 09:44:27AM +0200, David Hildenbrand wrote:
>>>> On 28.08.25 09:21, Mike Rapoport wrote:
>>>>> On Thu, Aug 28, 2025 at 12:01:17AM +0200, David Hildenbrand wrote:
>>>>>> +	/*
>>>>>> +	 * We mark all tail pages with memblock_reserved_mark_noinit(),
>>>>>> +	 * so these pages are completely uninitialized.
>>>>>
>>>>>                                 ^ not? ;-)
>>>>
>>>> Can you elaborate?
>>>
>>> Oh, sorry, I misread "uninitialized".
>>> Still, I'd phrase it as
>>>
>>> 	/*
>>> 	 * We marked all tail pages with memblock_reserved_mark_noinit(),
>>> 	 * so we must initialize them here.
>>> 	 */
>>
>> I prefer what I currently have, but thanks for the review.
> 
> No strong feelings, feel free to add
> 
> Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> 

I now have

"As we marked all tail pages with memblock_reserved_mark_noinit(), we 
must initialize them ourselves here."

-- 
Cheers

David / dhildenb