Re: [PATCH 2/9] mm: make hw_pte_t visible to generic PTE interfaces

[Muhammad Usama Anjum <usama.anjum@arm.com>]

On 11/08/2026 11:15 am, Anshuman Khandual wrote:
> On Thu, Aug 06, 2026 at 09:38:40AM +0100, Muhammad Usama Anjum wrote:
>> Later conversions use hw_pte_t in page-table checking, generic page-table
>> helpers, and vmalloc interfaces. Include linux/pgtable_types.h from the
>> headers that declare those interfaces before changing their types.
>>
>> For vmalloc.h, replace the direct asm/page.h include with
>> linux/pgtable_types.h. The latter includes asm/page.h, so pgprot_t remains
>> available. It also provides either the default alias or the opted-in
>> hw_pte_t wrapper.
> 
> Stand-alone header file updates are not ideal. Why cannot these changes be
> folded in, where hw_pte_t gets used first time ever in the above mentioned
> places.
That's correct. This patch should be merged with the 3/9 patch. But that patch
is already too much big as it was generated with the help of Coccinelle. So I
kept it separate.

Do you still think we should merge it as its a special case?

> 
>>
>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@arm.com>
>> ---
>> Changes since RFC v1:
>> - Clarify that the header provides both generic hw_pte_t definitions.
>> ---
>>  include/linux/page_table_check.h | 2 ++
>>  include/linux/pgtable.h          | 1 +
>>  include/linux/vmalloc.h          | 2 +-
>>  3 files changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
>> index 12268a32e8be1..12ee6d16ad339 100644
>> --- a/include/linux/page_table_check.h
>> +++ b/include/linux/page_table_check.h
>> @@ -7,6 +7,8 @@
>>  #ifndef __LINUX_PAGE_TABLE_CHECK_H
>>  #define __LINUX_PAGE_TABLE_CHECK_H
>>  
>> +#include <linux/pgtable_types.h>
>> +
>>  #ifdef CONFIG_PAGE_TABLE_CHECK
>>  #include <linux/jump_label.h>
>>  
>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
>> index 8c093c119e5a8..cf595608cc4c4 100644
>> --- a/include/linux/pgtable.h
>> +++ b/include/linux/pgtable.h
>> @@ -4,6 +4,7 @@
>>  
>>  #include <linux/pfn.h>
>>  #include <asm/pgtable.h>
>> +#include <linux/pgtable_types.h>
>>  
>>  #define PMD_ORDER	(PMD_SHIFT - PAGE_SHIFT)
>>  #define PUD_ORDER	(PUD_SHIFT - PAGE_SHIFT)
>> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
>> index aed121d729b01..b068e6ade4207 100644
>> --- a/include/linux/vmalloc.h
>> +++ b/include/linux/vmalloc.h
>> @@ -8,7 +8,7 @@
>>  #include <linux/init.h>
>>  #include <linux/list.h>
>>  #include <linux/llist.h>
>> -#include <asm/page.h>		/* pgprot_t */
>> +#include <linux/pgtable_types.h>	/* pgprot_t, hw_pte_t */
>>  #include <linux/rbtree.h>
>>  #include <linux/overflow.h>
>>  
>> -- 
>> 2.47.3
>>

-- 
Thanks,
Usama