From: Jérôme Glisse <jgli...@redhat.com>
Using set_pte_at_notify() trigger useless calls to change_pte() so just
use set_pte_at() instead. The reason is that set_pte_at_notify() should
only be use when going from either a read and write pte to read only pte
with same pfn, or from read only to read and write with a different pfn.
The set_pte_at_notify() was use because __replace_page() code came from
the mm/ksm.c code in which the above rules are valid.
Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Peter Xu <pet...@redhat.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Matthew Wilcox <mawil...@microsoft.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Radim Krčmář <rkrc...@redhat.com>
Cc: Michal Hocko <mho...@kernel.org>
Cc: k...@vger.kernel.org
---
kernel/events/uprobes.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 87e76a1dc758..a4807b1edd7f 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -207,8 +207,7 @@ static int __replace_page(struct vm_area_struct *vma,
unsigned long addr,
flush_cache_page(vma, addr, pte_pfn(*pvmw.pte));
ptep_clear_flush_notify(vma, addr, pvmw.pte);
- set_pte_at_notify(mm, addr, pvmw.pte,
- mk_pte(new_page, vma->vm_page_prot));
+ set_pte_at(mm, addr, pvmw.pte, mk_pte(new_page, vma->vm_page_prot));
page_remove_rmap(old_page, false);
if (!page_mapped(old_page))
--
2.17.1
