[PATCH] ksm: madvise-rfc: really ugly fix for the oppss bug.

[Izik Eidus]

This patch is just so it can run without to crush with the madvise rfc patch.

True fix for this i think is adding another list for ksm inside the mm struct.
In the meanwhile i will try to think about other way how to fix this bug.

Hugh, i hope at least now you will be able to run it without it will crush to
you.

Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx>
---
 kernel/fork.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index e5ef58c..771b89a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -484,17 +484,18 @@ void mmput(struct mm_struct *mm)
 {
 	might_sleep();
 
+	spin_lock(&mmlist_lock);
 	if (atomic_dec_and_test(&mm->mm_users)) {
+		if (!list_empty(&mm->mmlist))
+			list_del(&mm->mmlist);
+		spin_unlock(&mmlist_lock);
 		exit_aio(mm);
 		exit_mmap(mm);
 		set_mm_exe_file(mm, NULL);
-		if (!list_empty(&mm->mmlist)) {
-			spin_lock(&mmlist_lock);
-			list_del(&mm->mmlist);
-			spin_unlock(&mmlist_lock);
-		}
 		put_swap_token(mm);
 		mmdrop(mm);
+	} else {
+		spin_unlock(&mmlist_lock);
 	}
 }
 EXPORT_SYMBOL_GPL(mmput);
-- 
1.5.6.5

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