m68k: mm: add calls to pagetable_pmd_[cd]tor

get_pointer_table() and free_pointer_table() already special-case
TABLE_PTE to call pagetable_pte_[cd]tor.  Let's do the same at PMD level
to improve accounting further.  TABLE_PGD and TABLE_PMD are currently
defined to the same value, so we first need to separate them.  That also
implies separating ptable_list for PMD/PGD levels.

Link: https://lkml.kernel.org/r/20250103184415.2744423-4-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 15 insertions, 8 deletions

diff --git a/arch/m68k/include/asm/motorola_pgalloc.h b/arch/m68k/include/asm/motorola_pgalloc.h
index 74a817d9387f..5abe7da8ac5a 100644
--- a/arch/m68k/include/asm/motorola_pgalloc.h
+++ b/arch/m68k/include/asm/motorola_pgalloc.h
@@ -9,9 +9,9 @@ extern void mmu_page_ctor(void *page);
 extern void mmu_page_dtor(void *page);
 
 enum m68k_table_types {
-	TABLE_PGD = 0,
-	TABLE_PMD = 0, /* same size as PGD */
-	TABLE_PTE = 1,
+	TABLE_PGD,
+	TABLE_PMD,
+	TABLE_PTE,
 };
 
 extern void init_pointer_table(void *table, int type);
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 81715cece70c..12de00df53c4 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -97,17 +97,19 @@ void mmu_page_dtor(void *page)
 
 typedef struct list_head ptable_desc;
 
-static struct list_head ptable_list[2] = {
+static struct list_head ptable_list[3] = {
 	LIST_HEAD_INIT(ptable_list[0]),
 	LIST_HEAD_INIT(ptable_list[1]),
+	LIST_HEAD_INIT(ptable_list[2]),
 };
 
 #define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page((void *)(page))->lru))
 #define PD_PAGE(ptable) (list_entry(ptable, struct page, lru))
 #define PD_MARKBITS(dp) (*(unsigned int *)&PD_PAGE(dp)->index)
 
-static const int ptable_shift[2] = {
-	7+2, /* PGD, PMD */
+static const int ptable_shift[3] = {
+	7+2, /* PGD */
+	7+2, /* PMD */
 	6+2, /* PTE */
 };
 
@@ -156,12 +158,17 @@ void *get_pointer_table(int type)
 		if (!(page = (void *)get_zeroed_page(GFP_KERNEL)))
 			return NULL;
 
-		if (type == TABLE_PTE) {
+		switch (type) {
+		case TABLE_PTE:
 			/*
 			 * m68k doesn't have SPLIT_PTE_PTLOCKS for not having
 			 * SMP.
 			 */
 			pagetable_pte_ctor(virt_to_ptdesc(page));
+			break;
+		case TABLE_PMD:
+			pagetable_pmd_ctor(virt_to_ptdesc(page));
+			break;
 		}
 
 		mmu_page_ctor(page);
@@ -200,7 +207,7 @@ int free_pointer_table(void *table, int type)
 		/* all tables in page are free, free page */
 		list_del(dp);
 		mmu_page_dtor((void *)page);
-		if (type == TABLE_PTE)
+		if (type == TABLE_PTE || type == TABLE_PMD)
 			pagetable_dtor(virt_to_ptdesc((void *)page));
 		free_page (page);
 		return 1;