[PATCH 1/X] uprobes: write_opcode: the new page needs PG_uptodate

[Oleg Nesterov]

write_opcode()->__replace_page() installs the new anonymous page,
this new_page is PageSwapBacked() and it can be swapped out.

However it forgets to do SetPageUptodate(), fix write_opcode().

For example, this is needed if do_swap_page() finds that orginial
page in the the swap cache (and doesn't try to read it back), in
this case it returns VM_FAULT_SIGBUS.
---
 kernel/uprobes.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index 3928bcc..52b20c8 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -200,6 +200,8 @@ static int write_opcode(struct task_struct *tsk, struct uprobe * uprobe,
 		goto put_out;
 	}
 
+	__SetPageUptodate(new_page);
+
 	/*
 	 * lock page will serialize against do_wp_page()'s
 	 * PageAnon() handling
-- 
1.5.5.1


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