s390/vdso: get rid of vdso_fault

Implement vdso mapping similar to arm64 and powerpc.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index a7eed8b..86e7a39 100644 (file)
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -20,7 +20,6 @@
 
 extern char vdso64_start[], vdso64_end[];
 static unsigned int vdso_pages;
-static struct page **vdso_pagelist;
 
 static union {
        struct vdso_data        data[CS_BASES];
@@ -41,17 +40,6 @@ static int __init vdso_setup(char *str)
 }
 __setup("vdso=", vdso_setup);
 
-static vm_fault_t vdso_fault(const struct vm_special_mapping *sm,
-                     struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-       if (vmf->pgoff >= vdso_pages)
-               return VM_FAULT_SIGBUS;
-
-       vmf->page = vdso_pagelist[vmf->pgoff];
-       get_page(vmf->page);
-       return 0;
-}
-
 static int vdso_mremap(const struct vm_special_mapping *sm,
                       struct vm_area_struct *vma)
 {
@@ -59,9 +47,8 @@ static int vdso_mremap(const struct vm_special_mapping *sm,
        return 0;
 }
 
-static const struct vm_special_mapping vdso_mapping = {
+static struct vm_special_mapping vdso_mapping = {
        .name = "[vdso]",
-       .fault = vdso_fault,
        .mremap = vdso_mremap,
 };
 
@@ -113,24 +100,20 @@ out:
 
 static int __init vdso_init(void)
 {
+       struct page **pages;
        int i;
 
        vdso_pages = ((vdso64_end - vdso64_start) >> PAGE_SHIFT) + 1;
-       /* Make sure pages are in the correct state */
-       vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
-                               GFP_KERNEL);
-       if (!vdso_pagelist) {
+       pages = kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL);
+       if (!pages) {
                vdso_enabled = 0;
                return -ENOMEM;
        }
-       for (i = 0; i < vdso_pages - 1; i++) {
-               struct page *pg = virt_to_page(vdso64_start + i * PAGE_SIZE);
-               get_page(pg);
-               vdso_pagelist[i] = pg;
-       }
-       vdso_pagelist[vdso_pages - 1] = virt_to_page(vdso_data);
-       vdso_pagelist[vdso_pages] = NULL;
-       get_page(virt_to_page(vdso_data));
+       for (i = 0; i < vdso_pages - 1; i++)
+               pages[i] = virt_to_page(vdso64_start + i * PAGE_SIZE);
+       pages[vdso_pages - 1] = virt_to_page(vdso_data);
+       pages[vdso_pages] = NULL;
+       vdso_mapping.pages = pages;
        return 0;
 }
 arch_initcall(vdso_init);