Merge master.kernel.org:/home/rmk/linux-2.6-i2c manually

[linux-2.6] / include / asm-ia64 / mmu_context.h

diff --git a/include/asm-ia64/mmu_context.h b/include/asm-ia64/mmu_context.h
index e3e5fededb04c4c63301afd1e309c1f022d749b0..8d6e72f7b08efce6251952c7e69241ce243f8e28 100644 (file)
--- a/include/asm-ia64/mmu_context.h
+++ b/include/asm-ia64/mmu_context.h
@@ -19,6 +19,7 @@
 
 #define ia64_rid(ctx,addr)     (((ctx) << 3) | (addr >> 61))
 
+# include <asm/page.h>
 # ifndef __ASSEMBLY__
 
 #include <linux/compiler.h>
@@ -55,34 +56,46 @@ static inline void
 delayed_tlb_flush (void)
 {
        extern void local_flush_tlb_all (void);
+       unsigned long flags;
 
        if (unlikely(__ia64_per_cpu_var(ia64_need_tlb_flush))) {
-               local_flush_tlb_all();
-               __ia64_per_cpu_var(ia64_need_tlb_flush) = 0;
+               spin_lock_irqsave(&ia64_ctx.lock, flags);
+               {
+                       if (__ia64_per_cpu_var(ia64_need_tlb_flush)) {
+                               local_flush_tlb_all();
+                               __ia64_per_cpu_var(ia64_need_tlb_flush) = 0;
+                       }
+               }
+               spin_unlock_irqrestore(&ia64_ctx.lock, flags);
        }
 }
 
-static inline mm_context_t
+static inline nv_mm_context_t
 get_mmu_context (struct mm_struct *mm)
 {
        unsigned long flags;
-       mm_context_t context = mm->context;
-
-       if (context)
-               return context;
-
-       spin_lock_irqsave(&ia64_ctx.lock, flags);
-       {
-               /* re-check, now that we've got the lock: */
-               context = mm->context;
-               if (context == 0) {
-                       cpus_clear(mm->cpu_vm_mask);
-                       if (ia64_ctx.next >= ia64_ctx.limit)
-                               wrap_mmu_context(mm);
-                       mm->context = context = ia64_ctx.next++;
+       nv_mm_context_t context = mm->context;
+
+       if (unlikely(!context)) {
+               spin_lock_irqsave(&ia64_ctx.lock, flags);
+               {
+                       /* re-check, now that we've got the lock: */
+                       context = mm->context;
+                       if (context == 0) {
+                               cpus_clear(mm->cpu_vm_mask);
+                               if (ia64_ctx.next >= ia64_ctx.limit)
+                                       wrap_mmu_context(mm);
+                               mm->context = context = ia64_ctx.next++;
+                       }
                }
+               spin_unlock_irqrestore(&ia64_ctx.lock, flags);
        }
-       spin_unlock_irqrestore(&ia64_ctx.lock, flags);
+       /*
+        * Ensure we're not starting to use "context" before any old
+        * uses of it are gone from our TLB.
+        */
+       delayed_tlb_flush();
+
        return context;
 }
 
@@ -104,13 +117,13 @@ destroy_context (struct mm_struct *mm)
 }
 
 static inline void
-reload_context (mm_context_t context)
+reload_context (nv_mm_context_t context)
 {
        unsigned long rid;
        unsigned long rid_incr = 0;
        unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
 
-       old_rr4 = ia64_get_rr(0x8000000000000000UL);
+       old_rr4 = ia64_get_rr(RGN_BASE(RGN_HPAGE));
        rid = context << 3;     /* make space for encoding the region number */
        rid_incr = 1 << 8;
 
@@ -122,6 +135,10 @@ reload_context (mm_context_t context)
        rr4 = rr0 + 4*rid_incr;
 #ifdef  CONFIG_HUGETLB_PAGE
        rr4 = (rr4 & (~(0xfcUL))) | (old_rr4 & 0xfc);
+
+#  if RGN_HPAGE != 4
+#    error "reload_context assumes RGN_HPAGE is 4"
+#  endif
 #endif
 
        ia64_set_rr(0x0000000000000000UL, rr0);
@@ -138,7 +155,7 @@ reload_context (mm_context_t context)
 static inline void
 activate_context (struct mm_struct *mm)
 {
-       mm_context_t context;
+       nv_mm_context_t context;
 
        do {
                context = get_mmu_context(mm);
@@ -157,8 +174,6 @@ activate_context (struct mm_struct *mm)
 static inline void
 activate_mm (struct mm_struct *prev, struct mm_struct *next)
 {
-       delayed_tlb_flush();
-
        /*
         * We may get interrupts here, but that's OK because interrupt handlers cannot
         * touch user-space.