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Subject[PATCH 5/8] 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>
---
arch/um/kernel/mem.c | 17 +++++++++--------
include/asm-um/page.h | 6 +++---
include/asm-um/pgtable-3level.h | 21 ++++++++++++++++++++-
include/asm-um/pgtable.h | 2 +-
4 files changed, 33 insertions(+), 13 deletions(-)
Index: linux-2.6.22/include/asm-um/page.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/page.h 2007-11-16 15:16:54.000000000 -0500
+++ linux-2.6.22/include/asm-um/page.h 2007-11-16 15:35:38.000000000 -0500
@@ -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))

@@ -108,8 +108,8 @@ 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)))
Index: linux-2.6.22/include/asm-um/pgtable-3level.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/pgtable-3level.h 2007-11-16 15:16:54.000000000 -0500
+++ linux-2.6.22/include/asm-um/pgtable-3level.h 2007-11-16 15:35:38.000000000 -0500
@@ -12,7 +12,11 @@

/* 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))

@@ -29,9 +33,15 @@
*/

#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) \
@@ -50,7 +60,12 @@
#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);
@@ -58,7 +73,11 @@ 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);
Index: linux-2.6.22/include/asm-um/pgtable.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/pgtable.h 2007-11-16 15:16:54.000000000 -0500
+++ linux-2.6.22/include/asm-um/pgtable.h 2007-11-16 15:35:38.000000000 -0500
@@ -262,7 +262,7 @@ static inline void set_pte(pte_t *pteptr

#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) \
Index: linux-2.6.22/arch/um/kernel/mem.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/mem.c 2007-11-16 15:33:46.000000000 -0500
+++ linux-2.6.22/arch/um/kernel/mem.c 2007-11-16 15:38:05.000000000 -0500
@@ -132,7 +132,7 @@ static void __init fixrange_init(unsigne
if (pud_none(*pud))
one_md_table_init(pud);
pmd = pmd_offset(pud, vaddr);
- for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
+ for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
one_page_table_init(pmd);
vaddr += PMD_SIZE;
}
@@ -191,22 +191,23 @@ static void __init fixaddr_user_init( vo
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
- unsigned long paddr, vaddr = FIXADDR_USER_START;
+ phys_t p;
+ unsigned long v, vaddr = FIXADDR_USER_START;

- if ( ! size )
+ if (!size)
return;

fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
- paddr = (unsigned long)alloc_bootmem_low_pages( size);
- memcpy( (void *)paddr, (void *)FIXADDR_USER_START, size);
- paddr = __pa(paddr);
+ v = (unsigned long) alloc_bootmem_low_pages(size);
+ memcpy((void *) v , (void *) FIXADDR_USER_START, size);
+ p = __pa(v);
for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
- paddr += PAGE_SIZE) {
+ p += PAGE_SIZE) {
pgd = swapper_pg_dir + pgd_index(vaddr);
pud = pud_offset(pgd, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
- pte_set_val( (*pte), paddr, PAGE_READONLY);
+ pte_set_val(*pte, p, PAGE_READONLY);
}
#endif
}
-
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