lkml.org 
[lkml]   [2014]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -mm 2/3] mm,numa: reorganize change_pmd_range
Date
From: Rik van Riel <riel@redhat.com>

Reorganize the order of ifs in change_pmd_range a little, in
preparation for the next patch.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Xing Gang <gang.xing@hp.com>
Tested-by: Chegu Vinod <chegu_vinod@hp.com>
---
mm/mprotect.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 769a67a..6006c05 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -118,6 +118,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
unsigned long this_pages;

next = pmd_addr_end(addr, end);
+ if (!pmd_trans_huge(*pmd) && pmd_none_or_clear_bad(pmd))
+ continue;
if (pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
split_huge_page_pmd(vma, addr, pmd);
@@ -133,10 +135,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
continue;
}
}
- /* fall through */
+ /* fall through, the trans huge pmd just split */
}
- if (pmd_none_or_clear_bad(pmd))
- continue;
+ VM_BUG_ON(pmd_trans_huge(*pmd));
this_pages = change_pte_range(vma, pmd, addr, next, newprot,
dirty_accountable, prot_numa);
pages += this_pages;
--
1.8.5.3


\
 
 \ /
  Last update: 2014-02-19 00:01    [W:0.072 / U:0.600 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site