Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6

[powerpc.git] / include / asm-generic / pgtable.h

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 9d774d0..00c2343 100644 (file)
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -182,6 +182,19 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #define arch_leave_lazy_mmu_mode()     do {} while (0)
 #endif
 
+/*
+ * A facility to provide batching of the reload of page tables with the
+ * actual context switch code for paravirtualized guests.  By convention,
+ * only one of the lazy modes (CPU, MMU) should be active at any given
+ * time, entry should never be nested, and entry and exits should always
+ * be paired.  This is for sanity of maintaining and reasoning about the
+ * kernel code.
+ */
+#ifndef __HAVE_ARCH_ENTER_LAZY_CPU_MODE
+#define arch_enter_lazy_cpu_mode()     do {} while (0)
+#define arch_leave_lazy_cpu_mode()     do {} while (0)
+#endif
+
 /*
  * When walking page tables, get the address of the next boundary,
  * or the end address of the range if that comes earlier.  Although no