powerpc: Remove unused paca->pgdir field

The pgdir field in the paca was a leftover from the dynamic VSIDs
patch, and is not used in the current kernel code.  This removes it.

Signed-off-by: Paul Mackerras <paulus@samba.org>

5 files changed, 0 insertions, 25 deletions

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 8f85c5e8a55a..aa0486d552a3 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -122,9 +122,6 @@ int main(void)
         DEFINE(PACASLBCACHE, offsetof(struct paca_struct, slb_cache));
         DEFINE(PACASLBCACHEPTR, offsetof(struct paca_struct, slb_cache_ptr));
         DEFINE(PACACONTEXTID, offsetof(struct paca_struct, context.id));
-#ifdef CONFIG_PPC_64K_PAGES
-        DEFINE(PACAPGDIR, offsetof(struct paca_struct, pgdir));
-#endif
 #ifdef CONFIG_HUGETLB_PAGE
         DEFINE(PACALOWHTLBAREAS, offsetof(struct paca_struct, context.low_htlb_areas));
         DEFINE(PACAHIGHHTLBAREAS, offsetof(struct paca_struct, context.high_htlb_areas));
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index ffc8ed4de62d..2cc61736feee 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -122,9 +122,6 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
 
         get_paca()->slb_cache_ptr = 0;
         get_paca()->context = mm->context;
-#ifdef CONFIG_PPC_64K_PAGES
-        get_paca()->pgdir = mm->pgd;
-#endif /* CONFIG_PPC_64K_PAGES */
 
         /*
          * preload some userspace segments into the SLB.
diff --git a/arch/powerpc/mm/stab.c b/arch/powerpc/mm/stab.c
index 4a9291d9fef8..691320c90b78 100644
--- a/arch/powerpc/mm/stab.c
+++ b/arch/powerpc/mm/stab.c
@@ -200,10 +200,6 @@ void switch_stab(struct task_struct *tsk, struct mm_struct *mm)
 
         __get_cpu_var(stab_cache_ptr) = 0;
 
-#ifdef CONFIG_PPC_64K_PAGES
-        get_paca()->pgdir = mm->pgd;
-#endif /* CONFIG_PPC_64K_PAGES */
-
         /* Now preload some entries for the new task */
         if (test_tsk_thread_flag(tsk, TIF_32BIT))
                 unmapped_base = TASK_UNMAPPED_BASE_USER32;
diff --git a/include/asm-powerpc/mmu_context.h b/include/asm-powerpc/mmu_context.h
index 1b8a25fd48f3..8c6b1a6d944f 100644
--- a/include/asm-powerpc/mmu_context.h
+++ b/include/asm-powerpc/mmu_context.h
@@ -20,16 +20,9 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-/*
- * Getting into a kernel thread, there is no valid user segment, mark
- * paca->pgdir NULL so that SLB miss on user addresses will fault
- */
 static inline void enter_lazy_tlb(struct mm_struct *mm,
                                   struct task_struct *tsk)
 {
-#ifdef CONFIG_PPC_64K_PAGES
-        get_paca()->pgdir = NULL;
-#endif /* CONFIG_PPC_64K_PAGES */
 }
 
 #define NO_CONTEXT      0
@@ -52,13 +45,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
                 cpu_set(smp_processor_id(), next->cpu_vm_mask);
 
         /* No need to flush userspace segments if the mm doesnt change */
-#ifdef CONFIG_PPC_64K_PAGES
-        if (prev == next && get_paca()->pgdir == next->pgd)
-                return;
-#else
         if (prev == next)
                 return;
-#endif /* CONFIG_PPC_64K_PAGES */
 
 #ifdef CONFIG_ALTIVEC
         if (cpu_has_feature(CPU_FTR_ALTIVEC))
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index 706325f99a84..c17fd54d995b 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -79,9 +79,6 @@ struct paca_struct {
         u64 exmc[10];           /* used for machine checks */
         u64 exslb[10];          /* used for SLB/segment table misses
                                  * on the linear mapping */
-#ifdef CONFIG_PPC_64K_PAGES
-        pgd_t *pgdir;
-#endif /* CONFIG_PPC_64K_PAGES */
 
         mm_context_t context;
         u16 slb_cache[SLB_CACHE_ENTRIES];