powerpc: add context.vdso_base for 32-bit too

This adds a vdso_base element to the mm_context_t for 32-bit compiles
(both for ARCH=powerpc and ARCH=ppc).  This fixes the compile errors
that have been reported in arch/powerpc/kernel/signal_32.c.
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/mmu_context_32.c

@@ -30,7 +30,7 @@
 #include <asm/mmu_context.h>
 #include <asm/tlbflush.h>
 
-mm_context_t next_mmu_context;
+unsigned long next_mmu_context;
 unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
 #ifdef FEW_CONTEXTS
 atomic_t nr_free_contexts;

arch/powerpc/mm/ppc_mmu_32.c

@@ -190,7 +190,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 		return;
 	pmd = pmd_offset(pgd_offset(mm, ea), ea);
 	if (!pmd_none(*pmd))
-		add_hash_page(mm->context, ea, pmd_val(*pmd));
+		add_hash_page(mm->context.id, ea, pmd_val(*pmd));
 }
 
 /*

arch/powerpc/mm/tlb_32.c

@@ -42,7 +42,7 @@ void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
 
 	if (Hash != 0) {
 		ptephys = __pa(ptep) & PAGE_MASK;
-		flush_hash_pages(mm->context, addr, ptephys, 1);
+		flush_hash_pages(mm->context.id, addr, ptephys, 1);
 	}
 }
 
@@ -102,7 +102,7 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
 	pmd_t *pmd;
 	unsigned long pmd_end;
 	int count;
-	unsigned int ctx = mm->context;
+	unsigned int ctx = mm->context.id;
 
 	if (Hash == 0) {
 		_tlbia();
@@ -172,7 +172,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
 	mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
 	pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
 	if (!pmd_none(*pmd))
-		flush_hash_pages(mm->context, vmaddr, pmd_val(*pmd), 1);
+		flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
 	FINISH_FLUSH;
 }
 

arch/powerpc/platforms/powermac/cpufreq_32.c

@@ -314,7 +314,7 @@ static int pmu_set_cpu_speed(int low_speed)
  		_set_L3CR(save_l3cr);
 
 	/* Restore userland MMU context */
-	set_context(current->active_mm->context, current->active_mm->pgd);
+	set_context(current->active_mm->context.id, current->active_mm->pgd);
 
 #ifdef DEBUG_FREQ
 	printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));

arch/powerpc/platforms/powermac/setup.c

@@ -458,7 +458,7 @@ static int pmac_pm_finish(suspend_state_t state)
 	printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);
 
 	/* Restore userland MMU context */
-	set_context(current->active_mm->context, current->active_mm->pgd);
+	set_context(current->active_mm->context.id, current->active_mm->pgd);
 
 	return 0;
 }

arch/ppc/mm/mmu_context.c

@@ -30,7 +30,7 @@
 #include <asm/mmu_context.h>
 #include <asm/tlbflush.h>
 
-mm_context_t next_mmu_context;
+unsigned long next_mmu_context;
 unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
 #ifdef FEW_CONTEXTS
 atomic_t nr_free_contexts;

drivers/macintosh/via-pmu.c

@@ -2268,7 +2268,7 @@ static int powerbook_sleep_grackle(void)
  		_set_L2CR(save_l2cr);
 	
 	/* Restore userland MMU context */
-	set_context(current->active_mm->context, current->active_mm->pgd);
+	set_context(current->active_mm->context.id, current->active_mm->pgd);
 
 	/* Power things up */
 	pmu_unlock();
@@ -2366,7 +2366,7 @@ powerbook_sleep_Core99(void)
  		_set_L3CR(save_l3cr);
 	
 	/* Restore userland MMU context */
-	set_context(current->active_mm->context, current->active_mm->pgd);
+	set_context(current->active_mm->context.id, current->active_mm->pgd);
 
 	/* Tell PMU we are ready */
 	pmu_unlock();

include/asm-ppc/mmu.h

@@ -24,8 +24,10 @@ extern phys_addr_t fixup_bigphys_addr(phys_addr_t, phys_addr_t);
 #define PHYS_FMT	"%16Lx"
 #endif
 
-/* Default "unsigned long" context */
-typedef unsigned long mm_context_t;
+typedef struct {
+	unsigned long id;
+	unsigned long vdso_base;
+} mm_context_t;
 
 /* Hardware Page Table Entry */
 typedef struct _PTE {

include/asm-ppc/mmu_context.h

@@ -71,7 +71,7 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 #else
 
 /* PPC 6xx, 7xx CPUs */
-#define NO_CONTEXT      	((mm_context_t) -1)
+#define NO_CONTEXT      	((unsigned long) -1)
 #define LAST_CONTEXT    	32767
 #define FIRST_CONTEXT    	1
 #endif
@@ -86,7 +86,7 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
  * can be used for debugging on all processors (if you happen to have
  * an Abatron).
  */
-extern void set_context(mm_context_t context, pgd_t *pgd);
+extern void set_context(unsigned long contextid, pgd_t *pgd);
 
 /*
  * Bitmap of contexts in use.
@@ -99,7 +99,7 @@ extern unsigned long context_map[];
  * Its use is an optimization only, we can't rely on this context
  * number to be free, but it usually will be.
  */
-extern mm_context_t next_mmu_context;
+extern unsigned long next_mmu_context;
 
 /*
  * If we don't have sufficient contexts to give one to every task
@@ -118,9 +118,9 @@ extern void steal_context(void);
  */
 static inline void get_mmu_context(struct mm_struct *mm)
 {
-	mm_context_t ctx;
+	unsigned long ctx;
 
-	if (mm->context != NO_CONTEXT)
+	if (mm->context.id != NO_CONTEXT)
 		return;
 #ifdef FEW_CONTEXTS
 	while (atomic_dec_if_positive(&nr_free_contexts) < 0)
@@ -133,7 +133,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
 			ctx = 0;
 	}
 	next_mmu_context = (ctx + 1) & LAST_CONTEXT;
-	mm->context = ctx;
+	mm->context.id = ctx;
 #ifdef FEW_CONTEXTS
 	context_mm[ctx] = mm;
 #endif
@@ -142,7 +142,12 @@ static inline void get_mmu_context(struct mm_struct *mm)
 /*
  * Set up the context for a new address space.
  */
-#define init_new_context(tsk,mm)	(((mm)->context = NO_CONTEXT), 0)
+static inline int init_new_context(struct task_struct *t, struct mm_struct *mm)
+{
+	mm->context.id = NO_CONTEXT;
+	mm->context.vdso_base = 0;
+	return 0;
+}
 
 /*
  * We're finished using the context for an address space.
@@ -150,9 +155,9 @@ static inline void get_mmu_context(struct mm_struct *mm)
 static inline void destroy_context(struct mm_struct *mm)
 {
 	preempt_disable();
-	if (mm->context != NO_CONTEXT) {
-		clear_bit(mm->context, context_map);
-		mm->context = NO_CONTEXT;
+	if (mm->context.id != NO_CONTEXT) {
+		clear_bit(mm->context.id, context_map);
+		mm->context.id = NO_CONTEXT;
 #ifdef FEW_CONTEXTS
 		atomic_inc(&nr_free_contexts);
 #endif
@@ -180,7 +185,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 
 	/* Setup new userspace context */
 	get_mmu_context(next);
-	set_context(next->context, next->pgd);
+	set_context(next->context.id, next->pgd);
 }
 
 #define deactivate_mm(tsk,mm)	do { } while (0)

include/asm-ppc/pgtable.h

@@ -663,7 +663,7 @@ static inline int __ptep_test_and_clear_young(unsigned int context, unsigned lon
 	return (old & _PAGE_ACCESSED) != 0;
 }
 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
-	__ptep_test_and_clear_young((__vma)->vm_mm->context, __addr, __ptep)
+	__ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep)
 
 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma,