[PATCH -queue] MIPS: fix HIGHMEM build error

[Yoichi Yuasa <yuasa@linux-mips.org>]

arch/mips/mm/highmem.c: In function 'kmap_init':
arch/mips/mm/highmem.c:130: error: 'init_mm' undeclared (first use in this 
function)
arch/mips/mm/highmem.c:130: error: (Each undeclared identifier is reported only 
once
arch/mips/mm/highmem.c:130: error: for each function it appears in.)

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
---
 arch/mips/mm/highmem.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index e274fda..127d732 100644
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -1,5 +1,6 @@
 #include <linux/module.h>
 #include <linux/highmem.h>
+#include <linux/sched.h>
 #include <linux/smp.h>
 #include <asm/fixmap.h>
 #include <asm/tlbflush.h>
-- 
1.7.0