[PATCH 5.4 070/222] drm/i915: Add missing include file <linux/math64.h>

[Greg Kroah-Hartman]

From: YueHaibing <yuehaibing@xxxxxxxxxx>

commit ea38aa2ea5b0969776f0a47f174ce928a22be803 upstream.

Fix build error:
./drivers/gpu/drm/i915/selftests/i915_random.h: In function i915_prandom_u32_max_state:
./drivers/gpu/drm/i915/selftests/i915_random.h:48:23: error:
 implicit declaration of function mul_u32_u32; did you mean mul_u64_u32_div? [-Werror=implicit-function-declaration]
  return upper_32_bits(mul_u32_u32(prandom_u32_state(state), ep_ro));

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 7ce5b6850b47 ("drm/i915/selftests: Use mul_u32_u32() for 32b x 32b -> 64b result")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200107135014.36472-1-yuehaibing@xxxxxxxxxx
(cherry picked from commit 62bf5465b26d1f502430b9c654be7d16bf2e242d)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/selftests/i915_random.h |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/selftests/i915_random.h
+++ b/drivers/gpu/drm/i915/selftests/i915_random.h
@@ -25,6 +25,7 @@
 #ifndef __I915_SELFTESTS_RANDOM_H__
 #define __I915_SELFTESTS_RANDOM_H__
 
+#include <linux/math64.h>
 #include <linux/random.h>
 
 #include "../i915_selftest.h"