Commit 01894295 authored by Dave Hansen's avatar Dave Hansen Committed by Andrew Morton
Browse files

mm: introduce pure page table freeing function 

The pages used for ptdescs are currently freed back to the allocator in a
single location.  They will shortly be freed from a second location.

Create a simple helper that just frees them back to the allocator.

Link: https://lkml.kernel.org/r/20251022082635.2462433-6-baolu.lu@linux.intel.com


Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Acked-by: default avatarMike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robin Murohy <robin.murphy@arm.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Cc: Vasant Hegde <vasant.hegde@amd.com>
Cc: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Yi Lai <yi1.lai@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 412d0003

include/linux/mm.h

+8 −3
Original line number Diff line number Diff line
@@ -3046,6 +3046,13 @@ static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int orde 
}

#define pagetable_alloc(...)	alloc_hooks(pagetable_alloc_noprof(__VA_ARGS__))



static inline void __pagetable_free(struct ptdesc *pt)

{

	struct page *page = ptdesc_page(pt);



	__free_pages(page, compound_order(page));

}



/**

 * pagetable_free - Free pagetables

 * @pt:	The page table descriptor
@@ -3055,12 +3062,10 @@ static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int orde 
 */

static inline void pagetable_free(struct ptdesc *pt)

{

	struct page *page = ptdesc_page(pt);



	if (ptdesc_test_kernel(pt))

		ptdesc_clear_kernel(pt);



	__free_pages(page, compound_order(page));

	__pagetable_free(pt);

}



#if defined(CONFIG_SPLIT_PTE_PTLOCKS)