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>

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 8f85c5e..aa0486d 100644 (file)
--- 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 ffc8ed4..2cc6173 100644 (file)
--- 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 4a9291d..691320c 100644 (file)
--- 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 1b8a25f..8c6b1a6 100644 (file)
--- 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 706325f..c17fd54 100644 (file)
--- 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];