linux-kernel - [PATCH] ktime: provide typesafe ktime_to

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Message-Id: <20180711181641.10369-1-edumazet@google.com>
Date:   Wed, 11 Jul 2018 11:16:41 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] ktime: provide typesafe ktime_to_ns()

Using ktime_to_ns() is nice to help backports to stable kernels.

Having a typesafe function instead of a macro avoid stupid typos
and waste of time tracking these typos.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Willem de Bruijn <willemb@...gle.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
---
 include/linux/ktime.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 5b9fddbaac4166b11121f75a3f3b4db7af1aac4c..b2bb44f87f5a3edb6ee6f179c83fcde42a363fe5 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -93,8 +93,11 @@ static inline ktime_t timeval_to_ktime(struct timeval tv)
 /* Map the ktime_t to timeval conversion to ns_to_timeval function */
 #define ktime_to_timeval(kt)		ns_to_timeval((kt))
 
-/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
-#define ktime_to_ns(kt)			(kt)
+/* Convert ktime_t to nanoseconds */
+static inline s64 ktime_to_ns(const ktime_t kt)
+{
+	return kt;
+}
 
 /**
  * ktime_compare - Compares two ktime_t variables for less, greater or equal
-- 
2.18.0.203.gfac676dfb9-goog