X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-parisc%2Ftlbflush.h;h=825994a90e2db1f42f80b6ce53f11fae9c51cc11;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=eb27b78930e811460eb4ae0be49f4b5c9abffabf;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/include/asm-parisc/tlbflush.h b/include/asm-parisc/tlbflush.h
index eb27b7893..825994a90 100644
--- a/include/asm-parisc/tlbflush.h
+++ b/include/asm-parisc/tlbflush.h
@@ -7,7 +7,22 @@
 #include <linux/mm.h>
 #include <asm/mmu_context.h>
 
+
+/* This is for the serialisation of PxTLB broadcasts.  At least on the
+ * N class systems, only one PxTLB inter processor broadcast can be
+ * active at any one time on the Merced bus.  This tlb purge
+ * synchronisation is fairly lightweight and harmless so we activate
+ * it on all SMP systems not just the N class.  We also need to have
+ * preemption disabled on uniprocessor machines, and spin_lock does that
+ * nicely.
+ */
+extern spinlock_t pa_tlb_lock;
+
+#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
+#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
+
 extern void flush_tlb_all(void);
+extern void flush_tlb_all_local(void *);
 
 /*
  * flush_tlb_mm()
@@ -64,29 +79,25 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
 {
 	unsigned long npages;
 
-	
 	npages = ((end - (start & PAGE_MASK)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
-	if (npages >= 512)  /* XXX arbitrary, should be tuned */
+	if (npages >= 512)  /* 2MB of space: arbitrary, should be tuned */
 		flush_tlb_all();
 	else {
-
 		mtsp(vma->vm_mm->context,1);
+		purge_tlb_start();
 		if (split_tlb) {
-			purge_tlb_start();
 			while (npages--) {
 				pdtlb(start);
 				pitlb(start);
 				start += PAGE_SIZE;
 			}
-			purge_tlb_end();
 		} else {
-			purge_tlb_start();
 			while (npages--) {
 				pdtlb(start);
 				start += PAGE_SIZE;
 			}
-			purge_tlb_end();
 		}
+		purge_tlb_end();
 	}
 }