linux-kernel - [PATCH] time: correct the prototype of ns_to_kernel_old_timeval and ns_to

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Date:   Tue, 12 Jul 2022 18:47:15 +0900
From:   Youngmin Nam <youngmin.nam@...sung.com>
To:     arnd@...db.de, jstultz@...gle.com, tglx@...utronix.de
Cc:     sboyd@...nel.org, linux-kernel@...r.kernel.org,
        youngmin.nam@...sung.com, chanho61.park@...sung.com,
        hajun.sung@...sung.com, hosung0.kim@...sung.com,
        d7271.choe@...sung.com
Subject: [PATCH] time: correct the prototype of ns_to_kernel_old_timeval and
 ns_to_timespec64

In ns_to_kernel_old_timeval() definition,
the function argument is defined with const identifier in kernel/time/time.c,
but the prototype in include/linux/time32.h looks different.

- The function is defined in kernel/time/time.c as below:
struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)

- The function is decalared in include/linux/time32.h as below:
extern struct __kernel_old_timeval ns_to_kernel_old_timeval(s64 nsec);

Because the variable of arithmethic types isn't modified in the calling scope,
there's no need to mark arguments as const.
And there is a review in Link[1] why it was omitted during review stage,
so they should be matched.

Likewise, we can remove the "const" keyword in both definition and declaration
of ns_to_timespec64() as it was metentined below Link[2] and Link[3].

Link[1]: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1637458.html
Link[2]: https://lore.kernel.org/all/20220531064346.51677-1-chanho61.park@samsung.com/T/
Link[3]: https://lore.kernel.org/lkml/CAK8P3a3nknJgEDESGdJH91jMj6R_xydFqWASd8r5BbesdvMBgA@mail.gmail.com
Fixes: a84d1169164b ("y2038: Introduce struct __kernel_old_timeval")
Signed-off-by: Youngmin Nam <youngmin.nam@...sung.com>
---
 include/linux/time64.h | 2 +-
 kernel/time/time.c     | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/time64.h b/include/linux/time64.h
index 81b9686a2079..ee021da0966e 100644
--- a/include/linux/time64.h
+++ b/include/linux/time64.h
@@ -142,7 +142,7 @@ static inline s64 timespec64_to_ns(const struct timespec64 *ts)
  *
  * Returns the timespec64 representation of the nsec parameter.
  */
-extern struct timespec64 ns_to_timespec64(const s64 nsec);
+extern struct timespec64 ns_to_timespec64(s64 nsec);
 
 /**
  * timespec64_add_ns - Adds nanoseconds to a timespec64
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 29923b20e0e4..526257b3727c 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -449,7 +449,7 @@ time64_t mktime64(const unsigned int year0, const unsigned int mon0,
 }
 EXPORT_SYMBOL(mktime64);
 
-struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
+struct __kernel_old_timeval ns_to_kernel_old_timeval(s64 nsec)
 {
 	struct timespec64 ts = ns_to_timespec64(nsec);
 	struct __kernel_old_timeval tv;
@@ -503,7 +503,7 @@ EXPORT_SYMBOL(set_normalized_timespec64);
  *
  * Returns the timespec64 representation of the nsec parameter.
  */
-struct timespec64 ns_to_timespec64(const s64 nsec)
+struct timespec64 ns_to_timespec64(s64 nsec)
 {
 	struct timespec64 ts = { 0, 0 };
 	s32 rem;
-- 
2.34.0