The patch titled
Subject: thp: do not mark zero-page pmd write-protected explicitly
has been added to the -mm tree. Its filename is
thp-do-not-mark-zero-page-pmd-write-protected-explicitly.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-do-not-mark-zero-page-pmd-write-protected-explicitly.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-do-not-mark-zero-page-pmd-write-protected-explicitly.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/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp: do not mark zero-page pmd write-protected explicitly
Zero pages can be used only in anonymous mappings, which never have
writable vma->vm_page_prot: see protection_map in mm/mmap.c and __PX1X
definitions.
Let's drop redundant pmd_wrprotect() in set_huge_zero_page().
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 1 -
1 file changed, 1 deletion(-)
diff -puN mm/huge_memory.c~thp-do-not-mark-zero-page-pmd-write-protected-explicitly mm/huge_memory.c
--- a/mm/huge_memory.c~thp-do-not-mark-zero-page-pmd-write-protected-explicitly
+++ a/mm/huge_memory.c
@@ -789,7 +789,6 @@ static bool set_huge_zero_page(pgtable_t
if (!pmd_none(*pmd))
return false;
entry = mk_pmd(zero_page, vma->vm_page_prot);
- entry = pmd_wrprotect(entry);
entry = pmd_mkhuge(entry);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, haddr, pmd, entry);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-free-compound-page-with-correct-order.patch
mm-thp-fix-collapsing-of-hugepages-on-madvise.patch
mm-verify-compound-order-when-freeing-a-page.patch
thp-do-not-mark-zero-page-pmd-write-protected-explicitly.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
mm-replace-remap_file_pages-syscall-with-emulation.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
