uml: fix page table data sizes

Get the sizes of various pieces of data right when using three-level
page tables.  pgd and pmd entries remain at 32 bits in a 32-bit
compilation because page tables will remain in low memory.  So,
PGDIR_SHIFT, the PTRS_PER_* values, set_pud, set_pmd are conditional
on 64BIT.

More use of phys_t is made when there are physical memory addresses
floating around.

ObCheckpatchViolationJustification - the new typedef is an alternate
definition of pmd_t, which I can't really live without.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 24 insertions, 5 deletions

diff --git a/include/asm-um/page.h b/include/asm-um/page.h
index 4b424c7..fe2374d 100644
--- a/include/asm-um/page.h
+++ b/include/asm-um/page.h
@@ -30,7 +30,7 @@ struct page;
 #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
 
 typedef struct { unsigned long pte_low, pte_high; } pte_t;
-typedef struct { unsigned long long pmd; } pmd_t;
+typedef struct { unsigned long pmd; } pmd_t;
 typedef struct { unsigned long pgd; } pgd_t;
 #define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
 
@@ -106,8 +106,8 @@ extern unsigned long uml_physmem;
 #define __pa(virt) to_phys((void *) (unsigned long) (virt))
 #define __va(phys) to_virt((unsigned long) (phys))
 
-#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
-#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
+#define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
+#define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
 
 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
diff --git a/include/asm-um/pgtable-3level.h b/include/asm-um/pgtable-3level.h
index e0b6c16..48f8f5d 100644
--- a/include/asm-um/pgtable-3level.h
+++ b/include/asm-um/pgtable-3level.h
@@ -11,7 +11,11 @@
 
 /* PGDIR_SHIFT determines what a third-level page table entry can map */
 
+#ifdef CONFIG_64BIT
 #define PGDIR_SHIFT	30
+#else
+#define PGDIR_SHIFT	31
+#endif
 #define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
@@ -28,9 +32,15 @@
  */
 
 #define PTRS_PER_PTE 512
+#ifdef CONFIG_64BIT
 #define PTRS_PER_PMD 512
-#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
 #define PTRS_PER_PGD 512
+#else
+#define PTRS_PER_PMD 1024
+#define PTRS_PER_PGD 1024
+#endif
+
+#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
 #define FIRST_USER_ADDRESS	0
 
 #define pte_ERROR(e) \
@@ -49,7 +59,12 @@
 #define pud_populate(mm, pud, pmd) \
 	set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))
 
+#ifdef CONFIG_64BIT
 #define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))
+#else
+#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
+#endif
+
 static inline int pgd_newpage(pgd_t pgd)
 {
 	return(pgd_val(pgd) & _PAGE_NEWPAGE);
@@ -57,7 +72,11 @@ static inline int pgd_newpage(pgd_t pgd)
 
 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
 
+#ifdef CONFIG_64BIT
 #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
+#else
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#endif
 
 struct mm_struct;
 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h
index bec4840..62ab94a 100644
--- a/include/asm-um/pgtable.h
+++ b/include/asm-um/pgtable.h
@@ -262,7 +262,7 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
 
 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
 #define __virt_to_page(virt) phys_to_page(__pa(virt))
-#define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
+#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
 #define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
 
 #define mk_pte(page, pgprot) \