[PATCH] ppc32: fix last_jiffy time comparison

This fixes a hang on ppc32.

The problem was that I was comparing a 32-bit quantity with a 64-bit
quantity, and consequently time wasn't advancing.  This makes us use a
64-bit quantity on all platforms, which ends up simplifying the code
since we can now get rid of the tb_last_stamp variable (which actually
fixes another bug that Ben H and I noticed while going carefully through
the code).

This works fine on my G4 tibook.  Let me know how it goes on your
machines.

Acked-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 18e59e4..a124499 100644 (file)
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -125,15 +125,8 @@ static long timezone_offset;
 unsigned long ppc_proc_freq;
 unsigned long ppc_tb_freq;
 
-u64 tb_last_jiffy __cacheline_aligned_in_smp;
-unsigned long tb_last_stamp;
-
-/*
- * Note that on ppc32 this only stores the bottom 32 bits of
- * the timebase value, but that's enough to tell when a jiffy
- * has passed.
- */
-DEFINE_PER_CPU(unsigned long, last_jiffy);
+static u64 tb_last_jiffy __cacheline_aligned_in_smp;
+static DEFINE_PER_CPU(u64, last_jiffy);
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 /*
@@ -458,7 +451,7 @@ void do_gettimeofday(struct timeval *tv)
                do {
                        seq = read_seqbegin_irqsave(&xtime_lock, flags);
                        sec = xtime.tv_sec;
-                       nsec = xtime.tv_nsec + tb_ticks_since(tb_last_stamp);
+                       nsec = xtime.tv_nsec + tb_ticks_since(tb_last_jiffy);
                } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
                usec = nsec / 1000;
                while (usec >= 1000000) {
@@ -700,7 +693,6 @@ void timer_interrupt(struct pt_regs * regs)
                tb_next_jiffy = tb_last_jiffy + tb_ticks_per_jiffy;
                if (per_cpu(last_jiffy, cpu) >= tb_next_jiffy) {
                        tb_last_jiffy = tb_next_jiffy;
-                       tb_last_stamp = per_cpu(last_jiffy, cpu);
                        do_timer(regs);
                        timer_recalc_offset(tb_last_jiffy);
                        timer_check_rtc();
@@ -749,7 +741,7 @@ void __init smp_space_timers(unsigned int max_cpus)
        int i;
        unsigned long half = tb_ticks_per_jiffy / 2;
        unsigned long offset = tb_ticks_per_jiffy / max_cpus;
-       unsigned long previous_tb = per_cpu(last_jiffy, boot_cpuid);
+       u64 previous_tb = per_cpu(last_jiffy, boot_cpuid);
 
        /* make sure tb > per_cpu(last_jiffy, cpu) for all cpus always */
        previous_tb -= tb_ticks_per_jiffy;
@@ -830,7 +822,7 @@ int do_settimeofday(struct timespec *tv)
         * and therefore the (jiffies - wall_jiffies) computation
         * has been removed.
         */
-       tb_delta = tb_ticks_since(tb_last_stamp);
+       tb_delta = tb_ticks_since(tb_last_jiffy);
        tb_delta = mulhdu(tb_delta, do_gtod.varp->tb_to_xs); /* in xsec */
        new_nsec -= SCALE_XSEC(tb_delta, 1000000000);
 
@@ -950,8 +942,7 @@ void __init time_init(void)
        if (__USE_RTC()) {
                /* 601 processor: dec counts down by 128 every 128ns */
                ppc_tb_freq = 1000000000;
-               tb_last_stamp = get_rtcl();
-               tb_last_jiffy = tb_last_stamp;
+               tb_last_jiffy = get_rtcl();
        } else {
                /* Normal PowerPC with timebase register */
                ppc_md.calibrate_decr();
@@ -959,7 +950,7 @@ void __init time_init(void)
                       ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
                printk(KERN_DEBUG "time_init: processor frequency   = %lu.%.6lu MHz\n",
                       ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
-               tb_last_stamp = tb_last_jiffy = get_tb();
+               tb_last_jiffy = get_tb();
        }
 
        tb_ticks_per_jiffy = ppc_tb_freq / HZ;
@@ -1036,7 +1027,7 @@ void __init time_init(void)
        do_gtod.varp = &do_gtod.vars[0];
        do_gtod.var_idx = 0;
        do_gtod.varp->tb_orig_stamp = tb_last_jiffy;
-       __get_cpu_var(last_jiffy) = tb_last_stamp;
+       __get_cpu_var(last_jiffy) = tb_last_jiffy;
        do_gtod.varp->stamp_xsec = (u64) xtime.tv_sec * XSEC_PER_SEC;
        do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
        do_gtod.varp->tb_to_xs = tb_to_xs;

diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index dcde441..5785ac4 100644 (file)
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -30,10 +30,6 @@ extern unsigned long tb_ticks_per_usec;
 extern unsigned long tb_ticks_per_sec;
 extern u64 tb_to_xs;
 extern unsigned      tb_to_us;
-extern unsigned long tb_last_stamp;
-extern u64 tb_last_jiffy;
-
-DECLARE_PER_CPU(unsigned long, last_jiffy);
 
 struct rtc_time;
 extern void to_tm(int tim, struct rtc_time * tm);