[PATCH] ppc64: Fix 32bit largepage issue

The paca holds a shadow of the context struct, used for the real mode SLB
handler.  When we open up a new segment we have to sync up the paca copy
otherwise we will instantiate small page SLB entries until the next context
switch (at which point we resync the paca copy).
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/mm/hugetlbpage.c

@@ -264,6 +264,10 @@ static int open_low_hpage_segs(struct mm_struct *mm, u16 newsegs)
 				return -EBUSY;
 
 	mm->context.htlb_segs |= newsegs;
+
+	/* update the paca copy of the context struct */
+	get_paca()->context = mm->context;
+
 	/* the context change must make it to memory before the flush,
 	 * so that further SLB misses do the right thing. */
 	mb();