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Date:	Thu,  6 Mar 2014 18:56:36 +0100
From:	Frederic Weisbecker <>
To:	LKML <>
Cc:	Frederic Weisbecker <>,
	Ingo Molnar <>,
	Marcelo Tosatti <>,
	Peter Zijlstra <>,
	Thomas Gleixner <>
Subject: [PATCH 1/6] cputime: Fix nsecs_to_cputime() return type cast

Even though nsec based cputime_t maps to u64, nsecs_to_cputime() must
return a cputime_t value. We want to enforce this kind of cast in order
to track down buggy manipulations of cputime_t such as direct access
of its values under wrong assumptions on its backend type (nsecs,
jiffies, etc...) by core code.

Cc: Ingo Molnar <>
Cc: Marcelo Tosatti <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Frederic Weisbecker <>
 include/asm-generic/cputime_nsecs.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/cputime_nsecs.h b/include/asm-generic/cputime_nsecs.h
index 2c9e62c..768294f 100644
--- a/include/asm-generic/cputime_nsecs.h
+++ b/include/asm-generic/cputime_nsecs.h
@@ -44,7 +44,8 @@ typedef u64 __nocast cputime64_t;
  * Convert cputime <-> nanoseconds
-#define nsecs_to_cputime(__nsecs)	((__force u64)(__nsecs))
+#define nsecs_to_cputime(__nsecs)	\
+	(__force cputime_t)(__nsecs)

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