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Subject[PATCH 11/11] UML - Use *SEC_PER_*SEC constants
There are various uses of powers of 1000, plus the odd BILLION
constant in the time code. However, there are perfectly good definitions of
*SEC_PER_*SEC in linux/time.h which can be used instaed.

These are replaced directly in kernel code. Userspace code imports
those constants as UM_*SEC_PER_*SEC and uses these.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
---
arch/um/include/common-offsets.h | 4 ++++
arch/um/include/os.h | 2 --
arch/um/kernel/time.c | 9 +++++----
arch/um/os-Linux/skas/process.c | 12 +++++++-----
arch/um/os-Linux/time.c | 16 ++++++++--------
5 files changed, 24 insertions(+), 19 deletions(-)
Index: linux-2.6.20/arch/um/kernel/time.c
===================================================================
--- linux-2.6.20.orig/arch/um/kernel/time.c 2007-09-19 12:25:07.000000000 -0400
+++ linux-2.6.20/arch/um/kernel/time.c 2007-09-19 12:25:08.000000000 -0400
@@ -17,7 +17,7 @@
*/
unsigned long long sched_clock(void)
{
- return (unsigned long long)jiffies_64 * (1000000000 / HZ);
+ return (unsigned long long)jiffies_64 * (NSEC_PER_SEC / HZ);
}

void timer_handler(int sig, struct uml_pt_regs *regs)
@@ -119,8 +119,9 @@ void __init time_init(void)
timer_init();

nsecs = os_nsecs();
- set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
- -nsecs % BILLION);
- set_normalized_timespec(&xtime, nsecs / BILLION, nsecs % BILLION);
+ set_normalized_timespec(&wall_to_monotonic, -nsecs / NSEC_PER_SEC,
+ -nsecs % NSEC_PER_SEC);
+ set_normalized_timespec(&xtime, nsecs / NSEC_PER_SEC,
+ nsecs % NSEC_PER_SEC);
late_time_init = setup_itimer;
}
Index: linux-2.6.20/arch/um/os-Linux/time.c
===================================================================
--- linux-2.6.20.orig/arch/um/os-Linux/time.c 2007-09-19 12:25:08.000000000 -0400
+++ linux-2.6.20/arch/um/os-Linux/time.c 2007-09-19 12:25:08.000000000 -0400
@@ -14,7 +14,7 @@

int set_interval(void)
{
- int usec = 1000000/UM_HZ;
+ int usec = UM_USEC_PER_SEC / UM_HZ;
struct itimerval interval = ((struct itimerval) { { 0, usec },
{ 0, usec } });

@@ -26,11 +26,11 @@ int set_interval(void)

int timer_one_shot(int ticks)
{
- unsigned long usec = ticks * 1000000 / UM_HZ;
- unsigned long sec = usec / 1000000;
+ unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ;
+ unsigned long sec = usec / UM_USEC_PER_SEC;
struct itimerval interval;

- usec %= 1000000;
+ usec %= UM_USEC_PER_SEC;
interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });

if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
@@ -47,8 +47,8 @@ static inline unsigned long long tv_to_n
* return.
*/

- return ((unsigned long long) tv->tv_sec) * BILLION +
- tv->tv_usec * 1000;
+ return ((unsigned long long) tv->tv_sec) * UM_NSEC_PER_SEC +
+ tv->tv_usec * UM_NSEC_PER_USEC;
}

unsigned long long disable_timer(void)
@@ -74,8 +74,8 @@ extern void alarm_handler(int sig, struc

void idle_sleep(unsigned long long nsecs)
{
- struct timespec ts = { .tv_sec = nsecs / BILLION,
- .tv_nsec = nsecs % BILLION };
+ struct timespec ts = { .tv_sec = nsecs / UM_NSEC_PER_SEC,
+ .tv_nsec = nsecs % UM_NSEC_PER_SEC };

if (nanosleep(&ts, &ts) == 0)
alarm_handler(SIGVTALRM, NULL);
Index: linux-2.6.20/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.20.orig/arch/um/os-Linux/skas/process.c 2007-09-19 12:25:08.000000000 -0400
+++ linux-2.6.20/arch/um/os-Linux/skas/process.c 2007-09-19 12:25:08.000000000 -0400
@@ -294,8 +294,8 @@ void userspace(struct uml_pt_regs *regs)

if (getitimer(ITIMER_VIRTUAL, &timer))
printk("Failed to get itimer, errno = %d\n", errno);
- nsecs = timer.it_value.tv_sec * BILLION +
- timer.it_value.tv_usec * 1000;
+ nsecs = timer.it_value.tv_sec * UM_NSEC_PER_SEC +
+ timer.it_value.tv_usec * UM_NSEC_PER_USEC;
nsecs += os_nsecs();

while (1) {
@@ -347,8 +347,10 @@ void userspace(struct uml_pt_regs *regs)
block_signals();
(*sig_info[sig])(sig, regs);
unblock_signals();
- nsecs = timer.it_value.tv_sec * BILLION +
- timer.it_value.tv_usec * 1000;
+ nsecs = timer.it_value.tv_sec *
+ UM_NSEC_PER_SEC +
+ timer.it_value.tv_usec *
+ UM_NSEC_PER_USEC;
nsecs += os_nsecs();
break;
case SIGIO:
@@ -395,7 +397,7 @@ __initcall(init_thread_regs);

int copy_context_skas0(unsigned long new_stack, int pid)
{
- struct timeval tv = { .tv_sec = 0, .tv_usec = 1000000 / UM_HZ };
+ struct timeval tv = { .tv_sec = 0, .tv_usec = UM_USEC_PER_SEC / UM_HZ };
int err;
unsigned long current_stack = current_stub_stack();
struct stub_data *data = (struct stub_data *) current_stack;
Index: linux-2.6.20/arch/um/include/common-offsets.h
===================================================================
--- linux-2.6.20.orig/arch/um/include/common-offsets.h 2007-09-19 12:25:05.000000000 -0400
+++ linux-2.6.20/arch/um/include/common-offsets.h 2007-09-19 12:25:08.000000000 -0400
@@ -34,3 +34,7 @@ DEFINE(crypto_tfm_ctx_offset, offsetof(s
DEFINE(UM_THREAD_SIZE, THREAD_SIZE);

DEFINE(UM_HZ, HZ);
+
+DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
Index: linux-2.6.20/arch/um/include/os.h
===================================================================
--- linux-2.6.20.orig/arch/um/include/os.h 2007-09-19 12:25:08.000000000 -0400
+++ linux-2.6.20/arch/um/include/os.h 2007-09-19 12:25:08.000000000 -0400
@@ -249,8 +249,6 @@ extern int setjmp_wrapper(void (*proc)(v
extern void os_dump_core(void);

/* time.c */
-#define BILLION (1000 * 1000 * 1000)
-
extern void idle_sleep(unsigned long long nsecs);
extern int set_interval(void);
extern int timer_one_shot(int ticks);
-
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