powerpc/vdso: don't clear PG_reserved

The VDSO is part of the kernel image and therefore the struct pages are
marked as reserved during boot.

As we install a special mapping, the actual struct pages will never be
exposed to MM via the page tables.  We can therefore leave the pages
marked as reserved.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Acked-by: Michael Ellerman <[email protected]>		[powerpc]
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 7725a971473670080f27c299181e5c5e228c6c37..a31b6234fcd7c87d3aa456d3deabc5584a1d2a0f 100644 (file)
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -798,7 +798,6 @@ static int __init vdso_init(void)
        BUG_ON(vdso32_pagelist == NULL);
        for (i = 0; i < vdso32_pages; i++) {
                struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
-               ClearPageReserved(pg);
                get_page(pg);
                vdso32_pagelist[i] = pg;
        }
@@ -812,7 +811,6 @@ static int __init vdso_init(void)
        BUG_ON(vdso64_pagelist == NULL);
        for (i = 0; i < vdso64_pages; i++) {
                struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
-               ClearPageReserved(pg);
                get_page(pg);
                vdso64_pagelist[i] = pg;
        }