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select: switch select() and poll() over to hrtimers

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With lots of help, input and cleanups from Thomas Gleixner

This patch switches select() and poll() over to hrtimers.

The core of the patch is replacing the "s64 timeout" with a
"struct timespec end_time" in all the plumbing.

But most of the diffstat comes from using the just introduced helpers:
	poll_select_set_timeout
	poll_select_copy_remaining
	timespec_add_safe
which make manipulating the timespec easier and less error-prone.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arjan van de Ven 2008-08-31 08:26:40 -07:00
parent be5dad20a5
commit 8ff3e8e85f
3 changed files with 111 additions and 294 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

136
fs/compat.c
View File

@ -1568,7 +1568,8 @@ int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
int compat_core_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
struct timespec *end_time)
{
fd_set_bits fds;
void *bits;
@ -1615,7 +1616,7 @@ int compat_core_sys_select(int n, compat_ulong_t __user *inp,
zero_fd_set(n, fds.res_out);
zero_fd_set(n, fds.res_ex);
ret = do_select(n, &fds, timeout);
ret = do_select(n, &fds, end_time);
if (ret < 0)
goto out;
@ -1641,7 +1642,7 @@ asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
struct compat_timeval __user *tvp)
{
s64 timeout = -1;
struct timespec end_time, *to = NULL;
struct compat_timeval tv;
int ret;
@ -1649,43 +1650,14 @@ asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
if (copy_from_user(&tv, tvp, sizeof(tv)))
return -EFAULT;
if (tv.tv_sec < 0 || tv.tv_usec < 0)
to = &end_time;
if (poll_select_set_timeout(to, tv.tv_sec,
tv.tv_usec * NSEC_PER_USEC))
return -EINVAL;
/* Cast to u64 to make GCC stop complaining */
if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
timeout = -1; /* infinite */
else {
timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ);
timeout += tv.tv_sec * HZ;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
if (tvp) {
struct compat_timeval rtv;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
rtv.tv_sec = timeout;
if (compat_timeval_compare(&rtv, &tv) >= 0)
rtv = tv;
if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND)
ret = -EINTR;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, to);
ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
return ret;
}
@ -1698,15 +1670,16 @@ asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
{
compat_sigset_t ss32;
sigset_t ksigmask, sigsaved;
s64 timeout = MAX_SCHEDULE_TIMEOUT;
struct compat_timespec ts;
struct timespec end_time, *to = NULL;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
if (ts.tv_sec < 0 || ts.tv_nsec < 0)
to = &end_time;
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
return -EINVAL;
}
@ -1721,51 +1694,8 @@ asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
do {
if (tsp) {
if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
timeout += ts.tv_sec * (unsigned long)HZ;
ts.tv_sec = 0;
ts.tv_nsec = 0;
} else {
ts.tv_sec -= MAX_SELECT_SECONDS;
timeout = MAX_SELECT_SECONDS * HZ;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
} while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
if (tsp) {
struct compat_timespec rts;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
rts.tv_sec = timeout / HZ;
rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
if (rts.tv_nsec >= NSEC_PER_SEC) {
rts.tv_sec++;
rts.tv_nsec -= NSEC_PER_SEC;
}
if (compat_timespec_compare(&rts, &ts) >= 0)
rts = ts;
if (copy_to_user(tsp, &rts, sizeof(rts))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND)
ret = -EINTR;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, to);
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
if (ret == -ERESTARTNOHAND) {
/*
@ -1810,18 +1740,16 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
compat_sigset_t ss32;
sigset_t ksigmask, sigsaved;
struct compat_timespec ts;
s64 timeout = -1;
struct timespec end_time, *to = NULL;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
/* We assume that ts.tv_sec is always lower than
the number of seconds that can be expressed in
an s64. Otherwise the compiler bitches at us */
timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ);
timeout += ts.tv_sec * HZ;
to = &end_time;
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
return -EINVAL;
}
if (sigmask) {
@ -1835,7 +1763,7 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = do_sys_poll(ufds, nfds, &timeout);
ret = do_sys_poll(ufds, nfds, to);
/* We can restart this syscall, usually */
if (ret == -EINTR) {
@ -1853,31 +1781,7 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
if (tsp && timeout >= 0) {
struct compat_timespec rts;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
/* Yes, we know it's actually an s64, but it's also positive. */
rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1000;
rts.tv_sec = timeout;
if (compat_timespec_compare(&rts, &ts) >= 0)
rts = ts;
if (copy_to_user(tsp, &rts, sizeof(rts))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND && timeout >= 0)
ret = -EINTR;
}
}
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
return ret;
}

263
fs/select.c
View File

@ -24,6 +24,7 @@
#include <linux/fdtable.h>
#include <linux/fs.h>
#include <linux/rcupdate.h>
#include <linux/hrtimer.h>
#include <asm/uaccess.h>
@ -203,8 +204,6 @@ sticky:
return ret;
}
#define FDS_IN(fds, n) (fds->in + n)
#define FDS_OUT(fds, n) (fds->out + n)
#define FDS_EX(fds, n) (fds->ex + n)
@ -257,11 +256,12 @@ get_max:
#define POLLOUT_SET (POLLWRBAND | POLLWRNORM | POLLOUT | POLLERR)
#define POLLEX_SET (POLLPRI)
int do_select(int n, fd_set_bits *fds, s64 *timeout)
int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
{
ktime_t expire, *to = NULL;
struct poll_wqueues table;
poll_table *wait;
int retval, i;
int retval, i, timed_out = 0;
rcu_read_lock();
retval = max_select_fd(n, fds);
@ -273,12 +273,14 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
poll_initwait(&table);
wait = &table.pt;
if (!*timeout)
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) {
wait = NULL;
timed_out = 1;
}
retval = 0;
for (;;) {
unsigned long *rinp, *routp, *rexp, *inp, *outp, *exp;
long __timeout;
set_current_state(TASK_INTERRUPTIBLE);
@ -334,27 +336,25 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
cond_resched();
}
wait = NULL;
if (retval || !*timeout || signal_pending(current))
if (retval || timed_out || signal_pending(current))
break;
if (table.error) {
retval = table.error;
break;
}
if (*timeout < 0) {
/* Wait indefinitely */
__timeout = MAX_SCHEDULE_TIMEOUT;
} else if (unlikely(*timeout >= (s64)MAX_SCHEDULE_TIMEOUT - 1)) {
/* Wait for longer than MAX_SCHEDULE_TIMEOUT. Do it in a loop */
__timeout = MAX_SCHEDULE_TIMEOUT - 1;
*timeout -= __timeout;
} else {
__timeout = *timeout;
*timeout = 0;
/*
* If this is the first loop and we have a timeout
* given, then we convert to ktime_t and set the to
* pointer to the expiry value.
*/
if (end_time && !to) {
expire = timespec_to_ktime(*end_time);
to = &expire;
}
__timeout = schedule_timeout(__timeout);
if (*timeout >= 0)
*timeout += __timeout;
if (!schedule_hrtimeout(to, HRTIMER_MODE_ABS))
timed_out = 1;
}
__set_current_state(TASK_RUNNING);
@ -375,7 +375,7 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
fd_set __user *exp, s64 *timeout)
fd_set __user *exp, struct timespec *end_time)
{
fd_set_bits fds;
void *bits;
@ -426,7 +426,7 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
zero_fd_set(n, fds.res_out);
zero_fd_set(n, fds.res_ex);
ret = do_select(n, &fds, timeout);
ret = do_select(n, &fds, end_time);
if (ret < 0)
goto out;
@ -452,7 +452,7 @@ out_nofds:
asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
fd_set __user *exp, struct timeval __user *tvp)
{
s64 timeout = -1;
struct timespec end_time, *to = NULL;
struct timeval tv;
int ret;
@ -460,43 +460,14 @@ asmlinkage long sys_select(int n, fd_set __user *inp, fd_set __user *outp,
if (copy_from_user(&tv, tvp, sizeof(tv)))
return -EFAULT;
if (tv.tv_sec < 0 || tv.tv_usec < 0)
to = &end_time;
if (poll_select_set_timeout(to, tv.tv_sec,
tv.tv_usec * NSEC_PER_USEC))
return -EINVAL;
/* Cast to u64 to make GCC stop complaining */
if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
timeout = -1; /* infinite */
else {
timeout = DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC/HZ);
timeout += tv.tv_sec * HZ;
}
}
ret = core_sys_select(n, inp, outp, exp, &timeout);
if (tvp) {
struct timeval rtv;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
rtv.tv_sec = timeout;
if (timeval_compare(&rtv, &tv) >= 0)
rtv = tv;
if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND)
ret = -EINTR;
}
}
ret = core_sys_select(n, inp, outp, exp, to);
ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
return ret;
}
@ -506,25 +477,17 @@ asmlinkage long sys_pselect7(int n, fd_set __user *inp, fd_set __user *outp,
fd_set __user *exp, struct timespec __user *tsp,
const sigset_t __user *sigmask, size_t sigsetsize)
{
s64 timeout = MAX_SCHEDULE_TIMEOUT;
sigset_t ksigmask, sigsaved;
struct timespec ts;
struct timespec ts, end_time, *to = NULL;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
if (ts.tv_sec < 0 || ts.tv_nsec < 0)
to = &end_time;
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
return -EINVAL;
/* Cast to u64 to make GCC stop complaining */
if ((u64)ts.tv_sec >= (u64)MAX_INT64_SECONDS)
timeout = -1; /* infinite */
else {
timeout = DIV_ROUND_UP(ts.tv_nsec, NSEC_PER_SEC/HZ);
timeout += ts.tv_sec * HZ;
}
}
if (sigmask) {
@ -538,32 +501,8 @@ asmlinkage long sys_pselect7(int n, fd_set __user *inp, fd_set __user *outp,
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = core_sys_select(n, inp, outp, exp, &timeout);
if (tsp) {
struct timespec rts;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1000;
rts.tv_sec = timeout;
if (timespec_compare(&rts, &ts) >= 0)
rts = ts;
if (copy_to_user(tsp, &rts, sizeof(rts))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND)
ret = -EINTR;
}
}
ret = core_sys_select(n, inp, outp, exp, &end_time);
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
if (ret == -ERESTARTNOHAND) {
/*
@ -649,18 +588,20 @@ static inline unsigned int do_pollfd(struct pollfd *pollfd, poll_table *pwait)
}
static int do_poll(unsigned int nfds, struct poll_list *list,
struct poll_wqueues *wait, s64 *timeout)
struct poll_wqueues *wait, struct timespec *end_time)
{
int count = 0;
poll_table* pt = &wait->pt;
ktime_t expire, *to = NULL;
int timed_out = 0, count = 0;
/* Optimise the no-wait case */
if (!(*timeout))
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) {
pt = NULL;
timed_out = 1;
}
for (;;) {
struct poll_list *walk;
long __timeout;
set_current_state(TASK_INTERRUPTIBLE);
for (walk = list; walk != NULL; walk = walk->next) {
@ -692,27 +633,21 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
if (signal_pending(current))
count = -EINTR;
}
if (count || !*timeout)
if (count || timed_out)
break;
if (*timeout < 0) {
/* Wait indefinitely */
__timeout = MAX_SCHEDULE_TIMEOUT;
} else if (unlikely(*timeout >= (s64)MAX_SCHEDULE_TIMEOUT-1)) {
/*
* Wait for longer than MAX_SCHEDULE_TIMEOUT. Do it in
* a loop
*/
__timeout = MAX_SCHEDULE_TIMEOUT - 1;
*timeout -= __timeout;
} else {
__timeout = *timeout;
*timeout = 0;
/*
* If this is the first loop and we have a timeout
* given, then we convert to ktime_t and set the to
* pointer to the expiry value.
*/
if (end_time && !to) {
expire = timespec_to_ktime(*end_time);
to = &expire;
}
__timeout = schedule_timeout(__timeout);
if (*timeout >= 0)
*timeout += __timeout;
if (!schedule_hrtimeout(to, HRTIMER_MODE_ABS))
timed_out = 1;
}
__set_current_state(TASK_RUNNING);
return count;
@ -721,7 +656,8 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
#define N_STACK_PPS ((sizeof(stack_pps) - sizeof(struct poll_list)) / \
sizeof(struct pollfd))
int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
struct timespec *end_time)
{
struct poll_wqueues table;
int err = -EFAULT, fdcount, len, size;
@ -761,7 +697,7 @@ int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
}
poll_initwait(&table);
fdcount = do_poll(nfds, head, &table, timeout);
fdcount = do_poll(nfds, head, &table, end_time);
poll_freewait(&table);
for (walk = head; walk; walk = walk->next) {
@ -787,16 +723,21 @@ out_fds:
static long do_restart_poll(struct restart_block *restart_block)
{
struct pollfd __user *ufds = (struct pollfd __user*)restart_block->arg0;
int nfds = restart_block->arg1;
s64 timeout = ((s64)restart_block->arg3<<32) | (s64)restart_block->arg2;
struct pollfd __user *ufds = restart_block->poll.ufds;
int nfds = restart_block->poll.nfds;
struct timespec *to = NULL, end_time;
int ret;
ret = do_sys_poll(ufds, nfds, &timeout);
if (restart_block->poll.has_timeout) {
end_time.tv_sec = restart_block->poll.tv_sec;
end_time.tv_nsec = restart_block->poll.tv_nsec;
to = &end_time;
}
ret = do_sys_poll(ufds, nfds, to);
if (ret == -EINTR) {
restart_block->fn = do_restart_poll;
restart_block->arg2 = timeout & 0xFFFFFFFF;
restart_block->arg3 = (u64)timeout >> 32;
ret = -ERESTART_RESTARTBLOCK;
}
return ret;
@ -805,31 +746,32 @@ static long do_restart_poll(struct restart_block *restart_block)
asmlinkage long sys_poll(struct pollfd __user *ufds, unsigned int nfds,
long timeout_msecs)
{
s64 timeout_jiffies;
struct timespec end_time, *to = NULL;
int ret;
if (timeout_msecs > 0) {
#if HZ > 1000
/* We can only overflow if HZ > 1000 */
if (timeout_msecs / 1000 > (s64)0x7fffffffffffffffULL / (s64)HZ)
timeout_jiffies = -1;
else
#endif
timeout_jiffies = msecs_to_jiffies(timeout_msecs) + 1;
} else {
/* Infinite (< 0) or no (0) timeout */
timeout_jiffies = timeout_msecs;
if (timeout_msecs >= 0) {
to = &end_time;
poll_select_set_timeout(to, timeout_msecs / MSEC_PER_SEC,
NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC));
}
ret = do_sys_poll(ufds, nfds, &timeout_jiffies);
ret = do_sys_poll(ufds, nfds, to);
if (ret == -EINTR) {
struct restart_block *restart_block;
restart_block = &current_thread_info()->restart_block;
restart_block->fn = do_restart_poll;
restart_block->arg0 = (unsigned long)ufds;
restart_block->arg1 = nfds;
restart_block->arg2 = timeout_jiffies & 0xFFFFFFFF;
restart_block->arg3 = (u64)timeout_jiffies >> 32;
restart_block->poll.ufds = ufds;
restart_block->poll.nfds = nfds;
if (timeout_msecs >= 0) {
restart_block->poll.tv_sec = end_time.tv_sec;
restart_block->poll.tv_nsec = end_time.tv_nsec;
restart_block->poll.has_timeout = 1;
} else
restart_block->poll.has_timeout = 0;
ret = -ERESTART_RESTARTBLOCK;
}
return ret;
@ -841,21 +783,16 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
size_t sigsetsize)
{
sigset_t ksigmask, sigsaved;
struct timespec ts;
s64 timeout = -1;
struct timespec ts, end_time, *to = NULL;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
/* Cast to u64 to make GCC stop complaining */
if ((u64)ts.tv_sec >= (u64)MAX_INT64_SECONDS)
timeout = -1; /* infinite */
else {
timeout = DIV_ROUND_UP(ts.tv_nsec, NSEC_PER_SEC/HZ);
timeout += ts.tv_sec * HZ;
}
to = &end_time;
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
return -EINVAL;
}
if (sigmask) {
@ -869,7 +806,7 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = do_sys_poll(ufds, nfds, &timeout);
ret = do_sys_poll(ufds, nfds, to);
/* We can restart this syscall, usually */
if (ret == -EINTR) {
@ -887,31 +824,7 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
if (tsp && timeout >= 0) {
struct timespec rts;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
/* Yes, we know it's actually an s64, but it's also positive. */
rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1000;
rts.tv_sec = timeout;
if (timespec_compare(&rts, &ts) >= 0)
rts = ts;
if (copy_to_user(tsp, &rts, sizeof(rts))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND && timeout >= 0)
ret = -EINTR;
}
}
ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
return ret;
}

6
include/linux/poll.h
View File

@ -114,11 +114,11 @@ void zero_fd_set(unsigned long nr, unsigned long *fdset)
#define MAX_INT64_SECONDS (((s64)(~((u64)0)>>1)/HZ)-1)
extern int do_select(int n, fd_set_bits *fds, s64 *timeout);
extern int do_select(int n, fd_set_bits *fds, struct timespec *end_time);
extern int do_sys_poll(struct pollfd __user * ufds, unsigned int nfds,
s64 *timeout);
struct timespec *end_time);
extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
fd_set __user *exp, s64 *timeout);
fd_set __user *exp, struct timespec *end_time);
extern int poll_select_set_timeout(struct timespec *to, long sec, long nsec);