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-rw-r--r--arch/um/include/os.h2
-rw-r--r--arch/um/kernel/process.c9
-rw-r--r--arch/um/os-Linux/signal.c9
-rw-r--r--arch/um/os-Linux/time.c27
4 files changed, 26 insertions, 21 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index e861c8adb44..12de1ea6837 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -250,7 +250,7 @@ extern void os_dump_core(void);
/* time.c */
#define BILLION (1000 * 1000 * 1000)
-extern void switch_timers(int to_real);
+extern int switch_timers(int to_real);
extern void idle_sleep(int secs);
extern int set_interval(int is_virtual);
extern void disable_timer(void);
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 8a6882dfba0..56d75afedbf 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -95,18 +95,11 @@ void *_switch_to(void *prev, void *next, void *last)
do {
current->thread.saved_task = NULL;
- /* XXX need to check runqueues[cpu].idle */
- if (current->pid == 0)
- switch_timers(0);
-
switch_threads(&from->thread.switch_buf,
&to->thread.switch_buf);
arch_switch_to(current->thread.prev_sched, current);
- if (current->pid == 0)
- switch_timers(1);
-
if (current->thread.saved_task)
show_regs(&(current->thread.regs));
next= current->thread.saved_task;
@@ -251,7 +244,9 @@ void default_idle(void)
if (need_resched())
schedule();
+ switch_timers(1);
idle_sleep(10);
+ switch_timers(0);
}
}
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 49c113b576b..1c5267ec13b 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -59,17 +59,11 @@ static void real_alarm_handler(int sig, struct sigcontext *sc)
{
struct uml_pt_regs regs;
- if (sig == SIGALRM)
- switch_timers(0);
-
if (sc != NULL)
copy_sc(&regs, sc);
regs.is_user = 0;
unblock_signals();
timer_handler(sig, &regs);
-
- if (sig == SIGALRM)
- switch_timers(1);
}
void alarm_handler(int sig, struct sigcontext *sc)
@@ -116,6 +110,7 @@ void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
void handle_signal(int sig, struct sigcontext *sc)
{
unsigned long pending = 1UL << sig;
+ int timer = switch_timers(0);
do {
int nested, bail;
@@ -152,6 +147,8 @@ void handle_signal(int sig, struct sigcontext *sc)
if (!nested)
pending = from_irq_stack(nested);
} while (pending);
+
+ switch_timers(timer);
}
extern void hard_handler(int sig);
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 5939653f99e..a16a0f484ed 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -12,6 +12,8 @@
#include "os.h"
#include "user.h"
+static int is_real_timer = 0;
+
int set_interval(int is_virtual)
{
int usec = 1000000/UM_HZ;
@@ -39,12 +41,14 @@ void disable_timer(void)
signal(SIGVTALRM, SIG_IGN);
}
-void switch_timers(int to_real)
+int switch_timers(int to_real)
{
struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
- struct itimerval enable = ((struct itimerval) { { 0, 1000000/UM_HZ },
- { 0, 1000000/UM_HZ }});
- int old, new;
+ struct itimerval enable;
+ int old, new, old_type = is_real_timer;
+
+ if(to_real == old_type)
+ return to_real;
if (to_real) {
old = ITIMER_VIRTUAL;
@@ -55,10 +59,19 @@ void switch_timers(int to_real)
new = ITIMER_VIRTUAL;
}
- if ((setitimer(old, &disable, NULL) < 0) ||
- (setitimer(new, &enable, NULL)))
- printk(UM_KERN_ERR "switch_timers - setitimer failed, "
+ if (setitimer(old, &disable, &enable) < 0)
+ printk(UM_KERN_ERR "switch_timers - setitimer disable failed, "
+ "errno = %d\n", errno);
+
+ if((enable.it_value.tv_sec == 0) && (enable.it_value.tv_usec == 0))
+ enable.it_value = enable.it_interval;
+
+ if (setitimer(new, &enable, NULL))
+ printk(UM_KERN_ERR "switch_timers - setitimer enable failed, "
"errno = %d\n", errno);
+
+ is_real_timer = to_real;
+ return old_type;
}
unsigned long long os_nsecs(void)