ptdesc: remove ptdesc_to_virt()

This has the same effect as ptdesc_address() so convert the callers to use
that and delete the function. Add kernel-doc for ptdesc_address().

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Cc: Vishal Moola (Oracle) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/arm/mm/mmu.c

···
 
 	if (!ptdesc || !pagetable_pte_ctor(NULL, ptdesc))
 		BUG();
-	return ptdesc_to_virt(ptdesc);
+	return ptdesc_address(ptdesc);
 }
 
 static pte_t * __init arm_pte_alloc(pmd_t *pmd, unsigned long addr,

arch/s390/mm/pgalloc.c

···
 
 	if (!ptdesc)
 		return NULL;
-	table = ptdesc_to_virt(ptdesc);
+	table = ptdesc_address(ptdesc);
 	__arch_set_page_dat(table, 1UL << CRST_ALLOC_ORDER);
 	return table;
 }
···
 
 	ptdesc = pagetable_alloc(GFP_KERNEL, 0);
 	if (ptdesc) {
-		table = (u64 *)ptdesc_to_virt(ptdesc);
+		table = (u64 *)ptdesc_address(ptdesc);
 		__arch_set_page_dat(table, 1);
 		memset64(table, _PAGE_INVALID, PTRS_PER_PTE);
 		memset64(table + PTRS_PER_PTE, 0, PTRS_PER_PTE);
···
 		pagetable_free(ptdesc);
 		return NULL;
 	}
-	table = ptdesc_to_virt(ptdesc);
+	table = ptdesc_address(ptdesc);
 	__arch_set_page_dat(table, 1);
 	memset64((u64 *)table, _PAGE_INVALID, PTRS_PER_PTE);
 	memset64((u64 *)table + PTRS_PER_PTE, 0, PTRS_PER_PTE);

include/linux/mm.h

···
 	return page_ptdesc(virt_to_page(x));
 }
 
-static inline void *ptdesc_to_virt(const struct ptdesc *pt)
-{
-	return page_to_virt(ptdesc_page(pt));
-}
-
+/**
+ * ptdesc_address - Virtual address of page table.
+ * @pt: Page table descriptor.
+ *
+ * Return: The first byte of the page table described by @pt.
+ */
 static inline void *ptdesc_address(const struct ptdesc *pt)
 {
 	return folio_address(ptdesc_folio(pt));