Make constants in kernel/timeconst.h fixed 64 bits

Force constants in kernel/timeconst.h (except shift counts) to be 64 bits,
using U64_C() constructor macros, and eliminate constants that cannot
be represented at all in 64 bits.  This avoids warnings with some gcc
versions.

Drop generating 64-bit constants, since we have no real hope of
getting a full set (operation on 64-bit values requires a 128-bit
intermediate result, which gcc only supports on 64-bit platforms, and
only with libgcc support on some.)  Note that the use of these
constants does not depend on if we are on a 32- or 64-bit architecture.

This resolves Bugzilla 10153.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/time.c b/kernel/time.c
index cbe0d5a222ff..6a08660b4fac 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -246,7 +246,7 @@ unsigned int inline jiffies_to_msecs(const unsigned long j)
         return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
 #else
 # if BITS_PER_LONG == 32
-        return ((u64)HZ_TO_MSEC_MUL32 * j) >> HZ_TO_MSEC_SHR32;
+        return (HZ_TO_MSEC_MUL32 * j) >> HZ_TO_MSEC_SHR32;
 # else
         return (j * HZ_TO_MSEC_NUM) / HZ_TO_MSEC_DEN;
 # endif
@@ -262,7 +262,7 @@ unsigned int inline jiffies_to_usecs(const unsigned long j)
         return (j + (HZ / USEC_PER_SEC) - 1)/(HZ / USEC_PER_SEC);
 #else
 # if BITS_PER_LONG == 32
-        return ((u64)HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
+        return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
 # else
         return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
 # endif
@@ -476,7 +476,7 @@ unsigned long msecs_to_jiffies(const unsigned int m)
         if (HZ > MSEC_PER_SEC && m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
                 return MAX_JIFFY_OFFSET;
 
-        return ((u64)MSEC_TO_HZ_MUL32 * m + MSEC_TO_HZ_ADJ32)
+        return (MSEC_TO_HZ_MUL32 * m + MSEC_TO_HZ_ADJ32)
                 >> MSEC_TO_HZ_SHR32;
 #endif
 }
@@ -491,7 +491,7 @@ unsigned long usecs_to_jiffies(const unsigned int u)
 #elif HZ > USEC_PER_SEC && !(HZ % USEC_PER_SEC)
         return u * (HZ / USEC_PER_SEC);
 #else
-        return ((u64)USEC_TO_HZ_MUL32 * u + USEC_TO_HZ_ADJ32)
+        return (USEC_TO_HZ_MUL32 * u + USEC_TO_HZ_ADJ32)
                 >> USEC_TO_HZ_SHR32;
 #endif
 }