Merge branch 'alpha-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88...

* 'alpha-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha-2.6:
  alpha: simplify and optimize sched_find_first_bit
  alpha: invoke oom-killer from page fault
  Convert alpha to use clocksources instead of arch_gettimeoffset

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b719398..24efdfe 100644 (file)
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -51,10 +51,6 @@ config GENERIC_TIME
        bool
        default y
 
-config ARCH_USES_GETTIMEOFFSET
-       bool
-       default y
-
 config GENERIC_CMOS_UPDATE
         def_bool y
 

diff --git a/arch/alpha/include/asm/bitops.h b/arch/alpha/include/asm/bitops.h
index 296da1d..1dce24b 100644 (file)
--- a/arch/alpha/include/asm/bitops.h
+++ b/arch/alpha/include/asm/bitops.h
@@ -438,22 +438,20 @@ static inline unsigned int __arch_hweight8(unsigned int w)
 
 /*
  * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
- * bits is set.
+ * way of searching a 100-bit bitmap.  It's guaranteed that at least
+ * one of the 100 bits is cleared.
  */
 static inline unsigned long
-sched_find_first_bit(unsigned long b[3])
+sched_find_first_bit(const unsigned long b[2])
 {
-       unsigned long b0 = b[0], b1 = b[1], b2 = b[2];
-       unsigned long ofs;
+       unsigned long b0, b1, ofs, tmp;
 
-       ofs = (b1 ? 64 : 128);
-       b1 = (b1 ? b1 : b2);
-       ofs = (b0 ? 0 : ofs);
-       b0 = (b0 ? b0 : b1);
+       b0 = b[0];
+       b1 = b[1];
+       ofs = (b0 ? 0 : 64);
+       tmp = (b0 ? b0 : b1);
 
-       return __ffs(b0) + ofs;
+       return __ffs(tmp) + ofs;
 }
 
 #include <asm-generic/bitops/ext2-non-atomic.h>

diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c
index 5465e93..1efbed8 100644 (file)
--- a/arch/alpha/kernel/time.c
+++ b/arch/alpha/kernel/time.c
@@ -51,6 +51,7 @@
 #include <linux/mc146818rtc.h>
 #include <linux/time.h>
 #include <linux/timex.h>
+#include <linux/clocksource.h>
 
 #include "proto.h"
 #include "irq_impl.h"
@@ -332,6 +333,34 @@ rpcc_after_update_in_progress(void)
        return rpcc();
 }
 
+#ifndef CONFIG_SMP
+/* Until and unless we figure out how to get cpu cycle counters
+   in sync and keep them there, we can't use the rpcc.  */
+static cycle_t read_rpcc(struct clocksource *cs)
+{
+       cycle_t ret = (cycle_t)rpcc();
+       return ret;
+}
+
+static struct clocksource clocksource_rpcc = {
+       .name                   = "rpcc",
+       .rating                 = 300,
+       .read                   = read_rpcc,
+       .mask                   = CLOCKSOURCE_MASK(32),
+       .flags                  = CLOCK_SOURCE_IS_CONTINUOUS
+};
+
+static inline void register_rpcc_clocksource(long cycle_freq)
+{
+       clocksource_calc_mult_shift(&clocksource_rpcc, cycle_freq, 4);
+       clocksource_register(&clocksource_rpcc);
+}
+#else /* !CONFIG_SMP */
+static inline void register_rpcc_clocksource(long cycle_freq)
+{
+}
+#endif /* !CONFIG_SMP */
+
 void __init
 time_init(void)
 {
@@ -385,6 +414,8 @@ time_init(void)
                __you_loose();
        }
 
+       register_rpcc_clocksource(cycle_freq);
+
        state.last_time = cc1;
        state.scaled_ticks_per_cycle
                = ((unsigned long) HZ << FIX_SHIFT) / cycle_freq;
@@ -394,44 +425,6 @@ time_init(void)
        alpha_mv.init_rtc();
 }
 
-/*
- * Use the cycle counter to estimate an displacement from the last time
- * tick.  Unfortunately the Alpha designers made only the low 32-bits of
- * the cycle counter active, so we overflow on 8.2 seconds on a 500MHz
- * part.  So we can't do the "find absolute time in terms of cycles" thing
- * that the other ports do.
- */
-u32 arch_gettimeoffset(void)
-{
-#ifdef CONFIG_SMP
-       /* Until and unless we figure out how to get cpu cycle counters
-          in sync and keep them there, we can't use the rpcc tricks.  */
-       return 0;
-#else
-       unsigned long delta_cycles, delta_usec, partial_tick;
-
-       delta_cycles = rpcc() - state.last_time;
-       partial_tick = state.partial_tick;
-       /*
-        * usec = cycles * ticks_per_cycle * 2**48 * 1e6 / (2**48 * ticks)
-        *      = cycles * (s_t_p_c) * 1e6 / (2**48 * ticks)
-        *      = cycles * (s_t_p_c) * 15625 / (2**42 * ticks)
-        *
-        * which, given a 600MHz cycle and a 1024Hz tick, has a
-        * dynamic range of about 1.7e17, which is less than the
-        * 1.8e19 in an unsigned long, so we are safe from overflow.
-        *
-        * Round, but with .5 up always, since .5 to even is harder
-        * with no clear gain.
-        */
-
-       delta_usec = (delta_cycles * state.scaled_ticks_per_cycle 
-                     + partial_tick) * 15625;
-       delta_usec = ((delta_usec / ((1UL << (FIX_SHIFT-6-1)) * HZ)) + 1) / 2;
-       return delta_usec * 1000;
-#endif
-}
-
 /*
  * In order to set the CMOS clock precisely, set_rtc_mmss has to be
  * called 500 ms after the second nowtime has started, because when

diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index 00a31de..fadd5f8 100644 (file)
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -142,7 +142,6 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
                        goto bad_area;
        }
 
- survive:
        /* If for any reason at all we couldn't handle the fault,
           make sure we exit gracefully rather than endlessly redo
           the fault.  */
@@ -188,16 +187,10 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
        /* We ran out of memory, or some other thing happened to us that
           made us unable to handle the page fault gracefully.  */
  out_of_memory:
-       if (is_global_init(current)) {
-               yield();
-               down_read(&mm->mmap_sem);
-               goto survive;
-       }
-       printk(KERN_ALERT "VM: killing process %s(%d)\n",
-              current->comm, task_pid_nr(current));
        if (!user_mode(regs))
                goto no_context;
-       do_group_exit(SIGKILL);
+       pagefault_out_of_memory();
+       return;
 
  do_sigbus:
        /* Send a sigbus, regardless of whether we were in kernel