linux-kernel - [071/107] time: Change jiffies_to_clock

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Date:	Wed, 02 Nov 2011 15:14:37 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, hank <pyu@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: [071/107] time: Change jiffies_to_clock_t() argument type to unsigned long

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: hank <pyu@...hat.com>

commit cbbc719fccdb8cbd87350a05c0d33167c9b79365 upstream.

The parameter's origin type is long. On an i386 architecture, it can
easily be larger than 0x80000000, causing this function to convert it
to a sign-extended u64 type.

Change the type to unsigned long so we get the correct result.

Signed-off-by: hank <pyu@...hat.com>
Cc: John Stultz <john.stultz@...aro.org>
[ build fix ]
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 include/linux/jiffies.h |    2 +-
 kernel/time.c           |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -303,7 +303,7 @@ extern void jiffies_to_timespec(const un
 extern unsigned long timeval_to_jiffies(const struct timeval *value);
 extern void jiffies_to_timeval(const unsigned long jiffies,
 			       struct timeval *value);
-extern clock_t jiffies_to_clock_t(long x);
+extern clock_t jiffies_to_clock_t(unsigned long x);
 extern unsigned long clock_t_to_jiffies(unsigned long x);
 extern u64 jiffies_64_to_clock_t(u64 x);
 extern u64 nsec_to_clock_t(u64 x);
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -593,7 +593,7 @@ EXPORT_SYMBOL(jiffies_to_timeval);
 /*
  * Convert jiffies/jiffies_64 to clock_t and back.
  */
-clock_t jiffies_to_clock_t(long x)
+clock_t jiffies_to_clock_t(unsigned long x)
 {
 #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
 # if HZ < USER_HZ


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