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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/parisc/include/asm/pgalloc.h
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@@ -10,148 +10,65 @@
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 #include <asm/cache.h>
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-/* Allocate the top level pgd (page directory)
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- *
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- * Here (for 64 bit kernels) we implement a Hybrid L2/L3 scheme: we
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- * allocate the first pmd adjacent to the pgd.  This means that we can
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- * subtract a constant offset to get to it.  The pmd and pgd sizes are
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- * arranged so that a single pmd covers 4GB (giving a full 64-bit
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- * process access to 8TB) so our lookups are effectively L2 for the
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- * first 4GB of the kernel (i.e. for all ILP32 processes and all the
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- * kernel for machines with under 4GB of memory) */
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+#define __HAVE_ARCH_PMD_ALLOC_ONE
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+#define __HAVE_ARCH_PMD_FREE
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+#define __HAVE_ARCH_PGD_FREE
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+#include <asm-generic/pgalloc.h>
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+
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+/* Allocate the top level pgd (page directory) */
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 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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 {
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-	pgd_t *pgd = (pgd_t *)__get_free_pages(GFP_KERNEL,
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-					       PGD_ALLOC_ORDER);
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-	pgd_t *actual_pgd = pgd;
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+	pgd_t *pgd;
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-	if (likely(pgd != NULL)) {
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-		memset(pgd, 0, PAGE_SIZE<<PGD_ALLOC_ORDER);
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-#if CONFIG_PGTABLE_LEVELS == 3
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-		actual_pgd += PTRS_PER_PGD;
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-		/* Populate first pmd with allocated memory.  We mark it
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-		 * with PxD_FLAG_ATTACHED as a signal to the system that this
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-		 * pmd entry may not be cleared. */
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-		__pgd_val_set(*actual_pgd, (PxD_FLAG_PRESENT | 
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-				        PxD_FLAG_VALID | 
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-					PxD_FLAG_ATTACHED) 
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-			+ (__u32)(__pa((unsigned long)pgd) >> PxD_VALUE_SHIFT));
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-		/* The first pmd entry also is marked with PxD_FLAG_ATTACHED as
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-		 * a signal that this pmd may not be freed */
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-		__pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
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-#endif
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-	}
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-	return actual_pgd;
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+	pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
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+	if (unlikely(pgd == NULL))
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+		return NULL;
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+
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+	memset(pgd, 0, PAGE_SIZE << PGD_ORDER);
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+
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+	return pgd;
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 }
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 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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 {
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-#if CONFIG_PGTABLE_LEVELS == 3
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-	pgd -= PTRS_PER_PGD;
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-#endif
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-	free_pages((unsigned long)pgd, PGD_ALLOC_ORDER);
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+	free_pages((unsigned long)pgd, PGD_ORDER);
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 }
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 #if CONFIG_PGTABLE_LEVELS == 3
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 /* Three Level Page Table Support for pmd's */
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40
 
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-static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
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+static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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 {
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-	__pgd_val_set(*pgd, (PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
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-		        (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT));
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+	set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
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+			(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
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 }
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 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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 {
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-	pmd_t *pmd = (pmd_t *)__get_free_pages(GFP_KERNEL, PMD_ORDER);
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-	if (pmd)
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-		memset(pmd, 0, PAGE_SIZE<<PMD_ORDER);
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+	pmd_t *pmd;
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+
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+	pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_ORDER);
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+	if (likely(pmd))
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+		memset ((void *)pmd, 0, PAGE_SIZE << PMD_ORDER);
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 	return pmd;
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 }
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 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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 {
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-	if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED) {
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-		/*
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-		 * This is the permanent pmd attached to the pgd;
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-		 * cannot free it.
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-		 * Increment the counter to compensate for the decrement
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-		 * done by generic mm code.
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-		 */
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-		mm_inc_nr_pmds(mm);
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-		return;
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-	}
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 	free_pages((unsigned long)pmd, PMD_ORDER);
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 }
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-
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-#else
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-
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-/* Two Level Page Table Support for pmd's */
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-
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-/*
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- * allocating and freeing a pmd is trivial: the 1-entry pmd is
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- * inside the pgd, so has no extra memory associated with it.
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- */
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-
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-#define pmd_alloc_one(mm, addr)		({ BUG(); ((pmd_t *)2); })
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-#define pmd_free(mm, x)			do { } while (0)
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-#define pgd_populate(mm, pmd, pte)	BUG()
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-
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 #endif
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 static inline void
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 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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 {
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-#if CONFIG_PGTABLE_LEVELS == 3
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-	/* preserve the gateway marker if this is the beginning of
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-	 * the permanent pmd */
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-	if(pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
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-		__pmd_val_set(*pmd, (PxD_FLAG_PRESENT |
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-				 PxD_FLAG_VALID |
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-				 PxD_FLAG_ATTACHED) 
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-			+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT));
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-	else
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-#endif
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-		__pmd_val_set(*pmd, (PxD_FLAG_PRESENT | PxD_FLAG_VALID) 
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-			+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT));
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+	set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
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+		+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
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 }
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 #define pmd_populate(mm, pmd, pte_page) \
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 	pmd_populate_kernel(mm, pmd, page_address(pte_page))
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 #define pmd_pgtable(pmd) pmd_page(pmd)
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-
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-static inline pgtable_t
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-pte_alloc_one(struct mm_struct *mm, unsigned long address)
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-{
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-	struct page *page = alloc_page(GFP_KERNEL|__GFP_ZERO);
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-	if (!page)
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-		return NULL;
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-	if (!pgtable_page_ctor(page)) {
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-		__free_page(page);
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-		return NULL;
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-	}
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-	return page;
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-}
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-
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-static inline pte_t *
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-pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
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-{
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-	pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
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-	return pte;
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-}
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-
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-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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-{
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-	free_page((unsigned long)pte);
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-}
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-
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-static inline void pte_free(struct mm_struct *mm, struct page *pte)
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-{
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-	pgtable_page_dtor(pte);
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-	pte_free_kernel(mm, page_address(pte));
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-}
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-
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-#define check_pgt_cache()	do { } while (0)
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 #endif