[PATCH] alpha: fix build failures

[Sudip Mukherjee]

The build of alpha allmodconfig is giving error:
arch/alpha/include/asm/mmu_context.h: In function 'ev5_switch_mm':
arch/alpha/include/asm/mmu_context.h:160:2: error:
	implicit declaration of function 'task_thread_info';
	did you mean 'init_thread_info'? [-Werror=implicit-function-declaration]

The file 'mmu_context.h' needed an extra header file.

Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---

The build log of next-20170915 is at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/275726322

 arch/alpha/include/asm/mmu_context.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/alpha/include/asm/mmu_context.h b/arch/alpha/include/asm/mmu_context.h
index 384bd47..45c020a 100644
--- a/arch/alpha/include/asm/mmu_context.h
+++ b/arch/alpha/include/asm/mmu_context.h
@@ -8,6 +8,7 @@
  */
 
 #include <linux/mm_types.h>
+#include <linux/sched.h>
 
 #include <asm/machvec.h>
 #include <asm/compiler.h>
-- 
2.7.4

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