[patch] s390: get 4 level pgds working.

From: Martin Schwidefsky
Date: Thu Nov 11 2004 - 12:25:24 EST


[patch] s390: get 4 level pgds working.

From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

Replace mm->pgd with mm->pml4 in arch/s390 and add pte_read().

Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

diffstat:
arch/s390/kernel/process.c | 4 ++--
include/asm-s390/pgtable.h | 7 +++++++
2 files changed, 9 insertions(+), 2 deletions(-)

diff -urN linux-2.6/arch/s390/kernel/process.c linux-2.6-mm/arch/s390/kernel/process.c
--- linux-2.6/arch/s390/kernel/process.c 2004-11-11 15:59:51.000000000 +0100
+++ linux-2.6-mm/arch/s390/kernel/process.c 2004-11-11 15:44:19.000000000 +0100
@@ -261,14 +261,14 @@
save_fp_regs(&current->thread.fp_regs);
memcpy(&p->thread.fp_regs, &current->thread.fp_regs,
sizeof(s390_fp_regs));
- p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _SEGMENT_TABLE;
+ p->thread.user_seg = __pa((unsigned long) p->mm->pml4) | _SEGMENT_TABLE;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS)
p->thread.acrs[0] = regs->gprs[6];
#else /* CONFIG_ARCH_S390X */
/* Save the fpu registers to new thread structure. */
save_fp_regs(&p->thread.fp_regs);
- p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _REGION_TABLE;
+ p->thread.user_seg = __pa((unsigned long) p->mm->pml4) | _REGION_TABLE;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
if (test_thread_flag(TIF_31BIT)) {
diff -urN linux-2.6/include/asm-s390/pgtable.h linux-2.6-mm/include/asm-s390/pgtable.h
--- linux-2.6/include/asm-s390/pgtable.h 2004-11-11 16:00:42.000000000 +0100
+++ linux-2.6-mm/include/asm-s390/pgtable.h 2004-11-11 15:52:26.000000000 +0100
@@ -398,6 +398,13 @@
return (pte_val(pte) & _PAGE_RO) == 0;
}

+static inline int pte_read(pte_t pte)
+{
+ /* A present pte can always be used for reading.
+ */
+ return 1;
+}
+
extern inline int pte_dirty(pte_t pte)
{
/* A pte is neither clean nor dirty on s/390. The dirty bit
-
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