From 2d17f907755b3aa9fe882831e72630bf4d69224d Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Fri, 9 May 2008 23:31:42 +0000
Subject: [PATCH] Add a stub for pmap_align_superpage() on machines that don't
 (yet) implement pmap-level support for superpages.

---
 sys/arm/arm/pmap.c                  | 10 ++++++++++
 sys/ia64/ia64/pmap.c                | 10 ++++++++++
 sys/mips/mips/pmap.c                | 10 ++++++++++
 sys/powerpc/powerpc/pmap_dispatch.c | 10 ++++++++++
 sys/sparc64/sparc64/pmap.c          | 10 ++++++++++
 sys/sun4v/sun4v/pmap.c              | 10 ++++++++++
 6 files changed, 60 insertions(+)

diff --git a/sys/arm/arm/pmap.c b/sys/arm/arm/pmap.c
index 9d2247c74cb1..992fb584e434 100644
--- a/sys/arm/arm/pmap.c
+++ b/sys/arm/arm/pmap.c
@@ -4355,6 +4355,16 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
 	return(addr);
 }
 
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
+
 
 /*
  * Map a set of physical memory pages into the kernel virtual
diff --git a/sys/ia64/ia64/pmap.c b/sys/ia64/ia64/pmap.c
index cac6d47b8432..68218f60b5b9 100644
--- a/sys/ia64/ia64/pmap.c
+++ b/sys/ia64/ia64/pmap.c
@@ -2266,6 +2266,16 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
 	return addr;
 }
 
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
+
 #include "opt_ddb.h"
 
 #ifdef DDB
diff --git a/sys/mips/mips/pmap.c b/sys/mips/mips/pmap.c
index 03cba24b5b23..a55167cbd22e 100644
--- a/sys/mips/mips/pmap.c
+++ b/sys/mips/mips/pmap.c
@@ -2851,6 +2851,16 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
 	return addr;
 }
 
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
+
 int pmap_pid_dump(int pid);
 
 int
diff --git a/sys/powerpc/powerpc/pmap_dispatch.c b/sys/powerpc/powerpc/pmap_dispatch.c
index eab6689e130c..6b79622c3a1f 100644
--- a/sys/powerpc/powerpc/pmap_dispatch.c
+++ b/sys/powerpc/powerpc/pmap_dispatch.c
@@ -303,6 +303,16 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
 	return (MMU_ADDR_HINT(mmu_obj, obj, addr, size));
 }
 
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
+
 
 
 /*
diff --git a/sys/sparc64/sparc64/pmap.c b/sys/sparc64/sparc64/pmap.c
index ad4d249ee286..a0a622dd50bf 100644
--- a/sys/sparc64/sparc64/pmap.c
+++ b/sys/sparc64/sparc64/pmap.c
@@ -1984,3 +1984,13 @@ pmap_addr_hint(vm_object_t object, vm_offset_t va, vm_size_t size)
 
 	return (va);
 }
+
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
diff --git a/sys/sun4v/sun4v/pmap.c b/sys/sun4v/sun4v/pmap.c
index 1b743744179e..3fe21dda3a03 100644
--- a/sys/sun4v/sun4v/pmap.c
+++ b/sys/sun4v/sun4v/pmap.c
@@ -430,6 +430,16 @@ pmap_addr_hint(vm_object_t object, vm_offset_t va, vm_size_t size)
 	return (va);
 }
 
+/*
+ *	Increase the starting virtual address of the given mapping if a
+ *	different alignment might result in more superpage mappings.
+ */
+void
+pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
+    vm_offset_t *addr, vm_size_t size)
+{
+}
+
 /*
  * Bootstrap the system enough to run with virtual memory.
  */