Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6: (78 commits) [PARISC] Use symbolic last syscall in __NR_Linux_syscalls [PARISC] Add missing statfs64 and fstatfs64 syscalls Revert "[PARISC] Optimize TLB flush on SMP systems" [PARISC] Compat signal fixes for 64-bit parisc [PARISC] Reorder syscalls to match unistd.h Revert "[PATCH] make kernel/signal.c:kill_proc_info() static" [PARISC] fix sys_rt_sigqueueinfo [PARISC] fix section mismatch warnings in harmony sound driver [PARISC] do not export get_register/set_register [PARISC] add ENTRY()/ENDPROC() and simplify assembly of HP/UX emulation code [PARISC] convert to use CONFIG_64BIT instead of __LP64__ [PARISC] use CONFIG_64BIT instead of __LP64__ [PARISC] add ASM_EXCEPTIONTABLE_ENTRY() macro [PARISC] more ENTRY(), ENDPROC(), END() conversions [PARISC] fix ENTRY() and ENDPROC() for 64bit-parisc [PARISC] Fixes /proc/cpuinfo cache output on B160L [PARISC] implement standard ENTRY(), END() and ENDPROC() [PARISC] kill ENTRY_SYS_CPUS [PARISC] clean up debugging printks in smp.c [PARISC] factor syscall_restart code out of do_signal ... Fix conflict in include/linux/sched.h due to kill_proc_info() being made publicly available to PARISC again.
This commit is contained in:
Linus Torvalds
@ -22,6 +22,7 @@
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/profile.h>
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#include <linux/clocksource.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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@ -98,7 +99,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
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* cycles after the IT fires. But it's arbitrary how much time passes
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* before we call it "late". I've picked one second.
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*/
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if (ticks_elapsed > HZ) {
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if (unlikely(ticks_elapsed > HZ)) {
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/* Scenario 3: very long delay? bad in any case */
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printk (KERN_CRIT "timer_interrupt(CPU %d): delayed!"
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" cycles %lX rem %lX "
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@ -147,10 +148,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
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write_sequnlock(&xtime_lock);
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}
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/* check soft power switch status */
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if (cpu == 0 && !atomic_read(&power_tasklet.count))
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tasklet_schedule(&power_tasklet);
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return IRQ_HANDLED;
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}
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@ -172,121 +169,41 @@ unsigned long profile_pc(struct pt_regs *regs)
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EXPORT_SYMBOL(profile_pc);
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/*
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* Return the number of micro-seconds that elapsed since the last
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* update to wall time (aka xtime). The xtime_lock
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* must be at least read-locked when calling this routine.
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*/
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static inline unsigned long gettimeoffset (void)
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/* clock source code */
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static cycle_t read_cr16(void)
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{
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#ifndef CONFIG_SMP
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/*
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* FIXME: This won't work on smp because jiffies are updated by cpu 0.
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* Once parisc-linux learns the cr16 difference between processors,
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* this could be made to work.
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*/
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unsigned long now;
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unsigned long prev_tick;
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unsigned long next_tick;
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unsigned long elapsed_cycles;
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unsigned long usec;
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unsigned long cpuid = smp_processor_id();
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unsigned long cpt = clocktick;
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next_tick = cpu_data[cpuid].it_value;
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now = mfctl(16); /* Read the hardware interval timer. */
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prev_tick = next_tick - cpt;
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/* Assume Scenario 1: "now" is later than prev_tick. */
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elapsed_cycles = now - prev_tick;
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/* aproximate HZ with shifts. Intended math is "(elapsed/clocktick) > HZ" */
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#if HZ == 1000
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if (elapsed_cycles > (cpt << 10) )
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#elif HZ == 250
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if (elapsed_cycles > (cpt << 8) )
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#elif HZ == 100
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if (elapsed_cycles > (cpt << 7) )
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#else
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#warn WTF is HZ set to anyway?
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if (elapsed_cycles > (HZ * cpt) )
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#endif
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{
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/* Scenario 3: clock ticks are missing. */
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printk (KERN_CRIT "gettimeoffset(CPU %ld): missing %ld ticks!"
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" cycles %lX prev/now/next %lX/%lX/%lX clock %lX\n",
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cpuid, elapsed_cycles / cpt,
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elapsed_cycles, prev_tick, now, next_tick, cpt);
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}
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/* FIXME: Can we improve the precision? Not with PAGE0. */
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usec = (elapsed_cycles * 10000) / PAGE0->mem_10msec;
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return usec;
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#else
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return 0;
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#endif
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return get_cycles();
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}
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void
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do_gettimeofday (struct timeval *tv)
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static int cr16_update_callback(void);
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static struct clocksource clocksource_cr16 = {
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.name = "cr16",
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.rating = 300,
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.read = read_cr16,
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.mask = CLOCKSOURCE_MASK(BITS_PER_LONG),
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.mult = 0, /* to be set */
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.shift = 22,
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.update_callback = cr16_update_callback,
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.is_continuous = 1,
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};
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static int cr16_update_callback(void)
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{
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unsigned long flags, seq, usec, sec;
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int change = 0;
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/* Hold xtime_lock and adjust timeval. */
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do {
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seq = read_seqbegin_irqsave(&xtime_lock, flags);
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usec = gettimeoffset();
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sec = xtime.tv_sec;
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usec += (xtime.tv_nsec / 1000);
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} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
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/* Move adjusted usec's into sec's. */
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while (usec >= USEC_PER_SEC) {
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usec -= USEC_PER_SEC;
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++sec;
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/* since the cr16 cycle counters are not syncronized across CPUs,
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we'll check if we should switch to a safe clocksource: */
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if (clocksource_cr16.rating != 0 && num_online_cpus() > 1) {
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clocksource_cr16.rating = 0;
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clocksource_reselect();
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change = 1;
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}
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/* Return adjusted result. */
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tv->tv_sec = sec;
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tv->tv_usec = usec;
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return change;
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}
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EXPORT_SYMBOL(do_gettimeofday);
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int
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do_settimeofday (struct timespec *tv)
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{
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time_t wtm_sec, sec = tv->tv_sec;
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long wtm_nsec, nsec = tv->tv_nsec;
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if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
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return -EINVAL;
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write_seqlock_irq(&xtime_lock);
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{
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/*
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* This is revolting. We need to set "xtime"
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* correctly. However, the value in this location is
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* the value at the most recent update of wall time.
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* Discover what correction gettimeofday would have
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* done, and then undo it!
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*/
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nsec -= gettimeoffset() * 1000;
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wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
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wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
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set_normalized_timespec(&xtime, sec, nsec);
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set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
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ntp_clear();
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}
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write_sequnlock_irq(&xtime_lock);
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clock_was_set();
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return 0;
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}
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EXPORT_SYMBOL(do_settimeofday);
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void __init start_cpu_itimer(void)
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{
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@ -301,11 +218,18 @@ void __init start_cpu_itimer(void)
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void __init time_init(void)
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{
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static struct pdc_tod tod_data;
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unsigned long current_cr16_khz;
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clocktick = (100 * PAGE0->mem_10msec) / HZ;
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start_cpu_itimer(); /* get CPU 0 started */
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/* register at clocksource framework */
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current_cr16_khz = PAGE0->mem_10msec/10; /* kHz */
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clocksource_cr16.mult = clocksource_khz2mult(current_cr16_khz,
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clocksource_cr16.shift);
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clocksource_register(&clocksource_cr16);
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if (pdc_tod_read(&tod_data) == 0) {
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unsigned long flags;
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