The patch titled
Subject: s390/vdso: don't clear PG_reserved
has been added to the -mm tree. Its filename is
s390-vdso-dont-clear-pg_reserved.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/s390-vdso-dont-clear-pg_reserved.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/s390-vdso-dont-clear-pg_reserved.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: s390/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/20190114125903.24845-3-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Suggested-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/vdso.c | 2 --
1 file changed, 2 deletions(-)
--- a/arch/s390/kernel/vdso.c~s390-vdso-dont-clear-pg_reserved
+++ a/arch/s390/kernel/vdso.c
@@ -291,7 +291,6 @@ static int __init vdso_init(void)
BUG_ON(vdso32_pagelist == NULL);
for (i = 0; i < vdso32_pages - 1; i++) {
struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
- ClearPageReserved(pg);
get_page(pg);
vdso32_pagelist[i] = pg;
}
@@ -309,7 +308,6 @@ static int __init vdso_init(void)
BUG_ON(vdso64_pagelist == NULL);
for (i = 0; i < vdso64_pages - 1; i++) {
struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
- ClearPageReserved(pg);
get_page(pg);
vdso64_pagelist[i] = pg;
}
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-balloon-update-comment-about-isolation-migration-compaction.patch
mm-convert-pg_balloon-to-pg_offline.patch
kexec-export-pg_offline-to-vmcoreinfo.patch
xen-balloon-mark-inflated-pages-pg_offline.patch
hv_balloon-mark-inflated-pages-pg_offline.patch
vmw_balloon-mark-inflated-pages-pg_offline.patch
vmw_balloon-mark-inflated-pages-pg_offline-v2.patch
pm-hibernate-use-pfn_to_online_page.patch
pm-hibernate-exclude-all-pageoffline-pages.patch
pm-hibernate-exclude-all-pageoffline-pages-v2.patch
agp-efficeon-no-need-to-set-pg_reserved-on-gatt-tables.patch
s390-vdso-dont-clear-pg_reserved.patch
powerpc-vdso-dont-clear-pg_reserved.patch
riscv-vdso-dont-clear-pg_reserved.patch
m68k-mm-use-__clearpagereserved.patch
arm64-kexec-no-need-to-clearpagereserved.patch
arm64-kdump-no-need-to-mark-crashkernel-pages-manually-pg_reserved.patch
ia64-perfmon-dont-mark-buffer-pages-as-pg_reserved.patch
mm-better-document-pg_reserved.patch
