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[PATCH] uml: timer cleanups 

set_interval returns an error instead of panicing if setitimer fails.  Some of
its callers now check the return.

enable_timer is largely tt-mode-specific, so it is marked as such, and the
only skas-mode caller is made to call set-interval instead.

user_time_init was a no-value-added wrapper around set_interval, so it is
gone.

Since set_interval is now called from kernel code, callers no longer pass
ITIMER_* to it.  Instead, they pass a flag which is converted into ITIMER_REAL
or ITIMER_VIRTUAL.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-09-25 23:33:05 -07:00 committed by Linus Torvalds
parent 4b84c69b5f
commit 537ae946e8
4 changed files with 22 additions and 13 deletions
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4
arch/um/include/os.h
View File

@ -276,9 +276,11 @@ extern int setjmp_wrapper(void (*proc)(void *, void *), ...);
extern void switch_timers(int to_real);
extern void idle_sleep(int secs);
extern int set_interval(int is_virtual);
#ifdef CONFIG_MODE_TT
extern void enable_timer(void);
#endif
extern void disable_timer(void);
extern void user_time_init(void);
extern void uml_idle_timer(void);
extern unsigned long long os_nsecs(void);

7
arch/um/kernel/time.c
View File

@ -113,12 +113,15 @@ static void register_timer(void)
err = request_irq(TIMER_IRQ, um_timer, IRQF_DISABLED, "timer", NULL);
if(err != 0)
printk(KERN_ERR "timer_init : request_irq failed - "
printk(KERN_ERR "register_timer : request_irq failed - "
"errno = %d\n", -err);
timer_irq_inited = 1;
user_time_init();
err = set_interval(1);
if(err != 0)
printk(KERN_ERR "register_timer : set_interval failed - "
"errno = %d\n", -err);
}
extern void (*late_time_init)(void);

6
arch/um/os-Linux/skas/process.c
View File

@ -155,11 +155,15 @@ extern int __syscall_stub_start;
static int userspace_tramp(void *stack)
{
void *addr;
int err;
ptrace(PTRACE_TRACEME, 0, 0, 0);
init_new_thread_signals();
enable_timer();
err = set_interval(1);
if(err)
panic("userspace_tramp - setting timer failed, errno = %d\n",
err);
if(!proc_mm){
/* This has a pte, but it can't be mapped in with the usual

18
arch/um/os-Linux/time.c
View File

@ -17,20 +17,25 @@
#include "kern_constants.h"
#include "os.h"
static void set_interval(int timer_type)
int set_interval(int is_virtual)
{
int usec = 1000000/hz();
int timer_type = is_virtual ? ITIMER_VIRTUAL : ITIMER_REAL;
struct itimerval interval = ((struct itimerval) { { 0, usec },
{ 0, usec } });
if(setitimer(timer_type, &interval, NULL) == -1)
panic("setitimer failed - errno = %d\n", errno);
return -errno;
return 0;
}
#ifdef CONFIG_MODE_TT
void enable_timer(void)
{
set_interval(ITIMER_VIRTUAL);
set_interval(1);
}
#endif
void disable_timer(void)
{
@ -74,7 +79,7 @@ void uml_idle_timer(void)
set_handler(SIGALRM, (__sighandler_t) alarm_handler,
SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
set_interval(ITIMER_REAL);
set_interval(0);
}
#endif
@ -94,8 +99,3 @@ void idle_sleep(int secs)
ts.tv_nsec = 0;
nanosleep(&ts, NULL);
}
void user_time_init(void)
{
set_interval(ITIMER_VIRTUAL);
}