[PATCH v5 5/8] x86/mm: Use pagetable_free()

Lu Baolu posted 8 patches 1 week, 6 days ago
[PATCH v5 5/8] x86/mm: Use pagetable_free()
Posted by Lu Baolu 1 week, 6 days ago
The kernel's memory management subsystem provides a dedicated interface,
pagetable_free(), for freeing page table pages. Updates two call sites to
use pagetable_free() instead of the lower-level __free_page() or
free_pages(). This improves code consistency and clarity, and ensures the
correct freeing mechanism is used.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 arch/x86/mm/init_64.c        | 2 +-
 arch/x86/mm/pat/set_memory.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b9426fce5f3e..3d9a5e4ccaa4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1031,7 +1031,7 @@ static void __meminit free_pagetable(struct page *page, int order)
 		free_reserved_pages(page, nr_pages);
 #endif
 	} else {
-		free_pages((unsigned long)page_address(page), order);
+		pagetable_free(page_ptdesc(page));
 	}
 }
 
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index 8834c76f91c9..8b78a8855024 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -438,7 +438,7 @@ static void cpa_collapse_large_pages(struct cpa_data *cpa)
 
 	list_for_each_entry_safe(ptdesc, tmp, &pgtables, pt_list) {
 		list_del(&ptdesc->pt_list);
-		__free_page(ptdesc_page(ptdesc));
+		pagetable_free(ptdesc);
 	}
 }
 
-- 
2.43.0
Re: [PATCH v5 5/8] x86/mm: Use pagetable_free()
Posted by Jason Gunthorpe 1 week ago
On Fri, Sep 19, 2025 at 01:40:03PM +0800, Lu Baolu wrote:
> The kernel's memory management subsystem provides a dedicated interface,
> pagetable_free(), for freeing page table pages. Updates two call sites to
> use pagetable_free() instead of the lower-level __free_page() or
> free_pages(). This improves code consistency and clarity, and ensures the
> correct freeing mechanism is used.
> 
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
>  arch/x86/mm/init_64.c        | 2 +-
>  arch/x86/mm/pat/set_memory.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason