The parameter's origin type is long. On an i386 architecture, it can

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.

[akpm@linux-foundation.org: build fix]
Signed-off-by: hank <pyu@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>