The patch titled
Subject: mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix
has been added to the -mm tree. Its filename is
mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix
add comment
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/mm/page_alloc.c~mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix
+++ a/mm/page_alloc.c
@@ -1179,7 +1179,13 @@ static __always_inline bool free_pages_p
kernel_init_free_pages(page, 1 << order);
kernel_poison_pages(page, 1 << order, 0);
+ /*
+ * arch_free_page() can make the page's contents inaccessible. s390
+ * does this. So nothing which can access the page's contents should
+ * happen after this.
+ */
arch_free_page(page, order);
+
if (debug_pagealloc_enabled())
kernel_map_pages(page, 1 << order, 0);
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
ocfs2-clear-zero-in-unaligned-direct-io-checkpatch-fixes.patch
fs-ocfs2-fix-possible-null-pointer-dereferences-in-ocfs2_xa_prepare_entry-fix.patch
mm-page_alloc-fix-a-crash-in-free_pages_prepare-fix.patch
mm.patch
mm-slb-guarantee-natural-alignment-for-kmallocpower-of-two-fix.patch
mm-oom-avoid-printk-iteration-under-rcu-fix.patch
linux-next-git-rejects.patch
diff-sucks.patch
drivers-tty-serial-sh-scic-suppress-warning.patch
kernel-forkc-export-kernel_thread-to-modules.patch
