The patch titled
xen-paravirt_ops: allocate and free vmalloc areas
has been removed from the -mm tree. Its filename was
xen-paravirt_ops-allocate-and-free-vmalloc-areas.patch
This patch was dropped because Zach's patches destroyed it all
------------------------------------------------------
Subject: xen-paravirt_ops: allocate and free vmalloc areas
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Allocate/destroy a 'vmalloc' VM area: alloc_vm_area and free_vm_area The alloc
function ensures that page tables are constructed for the region of kernel
virtual address space and mapped into init_mm.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Ian Pratt <ian.pratt@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Cc: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Cc: "Andi Kleen" <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/mm/fault.c | 43 ++++++++++++++++++++++++++++++++++++++
include/linux/vmalloc.h | 4 +++
2 files changed, 47 insertions(+)
diff -puN arch/i386/mm/fault.c~xen-paravirt_ops-allocate-and-free-vmalloc-areas arch/i386/mm/fault.c
--- a/arch/i386/mm/fault.c~xen-paravirt_ops-allocate-and-free-vmalloc-areas
+++ a/arch/i386/mm/fault.c
@@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
#include <asm/system.h>
#include <asm/desc.h>
@@ -639,3 +640,45 @@ void _vmalloc_sync_all(void)
start = address + PGDIR_SIZE;
}
}
+
+
+static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
+{
+ /* apply_to_page_range() does all the hard work. */
+ return 0;
+}
+
+struct vm_struct *alloc_vm_area(unsigned long size)
+{
+ struct vm_struct *area;
+
+ area = get_vm_area(size, VM_IOREMAP);
+ if (area == NULL)
+ return NULL;
+
+ /*
+ * This ensures that page tables are constructed for this region
+ * of kernel virtual address space and mapped into init_mm.
+ */
+ if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
+ area->size, f, NULL)) {
+ free_vm_area(area);
+ return NULL;
+ }
+
+ /* Make sure the pagetables are constructed in process kernel
+ mappings */
+ vmalloc_sync_all();
+
+ return area;
+}
+EXPORT_SYMBOL_GPL(alloc_vm_area);
+
+void free_vm_area(struct vm_struct *area)
+{
+ struct vm_struct *ret;
+ ret = remove_vm_area(area->addr);
+ BUG_ON(ret != area);
+ kfree(area);
+}
+EXPORT_SYMBOL_GPL(free_vm_area);
diff -puN include/linux/vmalloc.h~xen-paravirt_ops-allocate-and-free-vmalloc-areas include/linux/vmalloc.h
--- a/include/linux/vmalloc.h~xen-paravirt_ops-allocate-and-free-vmalloc-areas
+++ a/include/linux/vmalloc.h
@@ -68,6 +68,10 @@ extern int map_vm_area(struct vm_struct
struct page ***pages);
extern void unmap_vm_area(struct vm_struct *area);
+/* Allocate/destroy a 'vmalloc' VM area. */
+extern struct vm_struct *alloc_vm_area(unsigned long size);
+extern void free_vm_area(struct vm_struct *area);
+
/*
* Internals. Dont't use..
*/
_
Patches currently in -mm which might be from jeremy@xxxxxxxx are
xen-paravirt_ops-allocate-and-free-vmalloc-areas.patch
xen-paravirt_ops-add-nosegneg-capability-to-the-vsyscall-page-notes.patch
xen-paravirt_ops-add-xen-config-options.patch
xen-paravirt_ops-add-xen-interface-header-files.patch
xen-paravirt_ops-core-xen-implementation.patch
xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console.patch
xen-paravirt_ops-add-early-printk-support-via-hvc-console.patch
xen-paravirt_ops-add-xen-grant-table-support.patch
xen-paravirt_ops-add-the-xenbus-sysfs-and-virtual-device-hotplug-driver.patch
xen-paravirt_ops-add-xen-virtual-block-device-driver.patch
xen-paravirt_ops-add-the-xen-virtual-network-device-driver.patch
fixes-and-cleanups-for-earlyprintk-aka-boot-console.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
