[kernel] refresh 2.6.27 patches based on -rc9

[openwrt.git] / target / linux / ar71xx / patches-2.6.27 / 902-mips_clocksource_init_war.patch

diff --git a/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch b/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
index bdf0d0f..564321c 100644 (file)
--- a/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
+++ b/target/linux/ar71xx/patches-2.6.27/902-mips_clocksource_init_war.patch
@@ -1,10 +1,9 @@
 --- a/arch/mips/kernel/cevt-r4k.c
 +++ b/arch/mips/kernel/cevt-r4k.c
-@@ -13,6 +13,22 @@
- #include <asm/smtc_ipi.h>
- #include <asm/time.h>
+@@ -15,6 +15,22 @@
+ #include <asm/cevt-r4k.h>
  
-+/*
+ /*
 + * Compare interrupt can be routed and latched outside the core,
 + * so a single execution hazard barrier may not be enough to give
 + * it time to clear as seen in the Cause register.  4 time the
@@ -20,46 +19,38 @@
 +              irq_disable_hazard(); \
 +      } while (0)
 +
- static int mips_next_event(unsigned long delta,
-                            struct clock_event_device *evt)
- {
-@@ -28,6 +44,7 @@
++/*
+  * The SMTC Kernel for the 34K, 1004K, et. al. replaces several
+  * of these routines with SMTC-specific variants.
+  */
+@@ -30,6 +46,7 @@
        cnt = read_c0_count();
        cnt += delta;
        write_c0_compare(cnt);
 +      compare_change_hazard();
        res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0;
- #ifdef CONFIG_MIPS_MT_SMTC
-       evpe(vpflags);
-@@ -187,7 +204,7 @@
-        */
-       if (c0_compare_int_pending()) {
-               write_c0_compare(read_c0_count());
--              irq_disable_hazard();
-+              compare_change_hazard();
-               if (c0_compare_int_pending())
-                       return 0;
-       }
-@@ -196,7 +213,7 @@
-               cnt = read_c0_count();
-               cnt += delta;
-               write_c0_compare(cnt);
--              irq_disable_hazard();
-+              compare_change_hazard();
-               if ((int)(read_c0_count() - cnt) < 0)
-                   break;
-               /* increase delta if the timer was already expired */
-@@ -205,11 +222,12 @@
-       while ((int)(read_c0_count() - cnt) <= 0)
-               ;       /* Wait for expiry  */
- 
-+      compare_change_hazard();
-       if (!c0_compare_int_pending())
-               return 0;
- 
-       write_c0_compare(read_c0_count());
--      irq_disable_hazard();
-+      compare_change_hazard();
-       if (c0_compare_int_pending())
-               return 0;
+       return res;
+ }
+@@ -99,22 +116,6 @@
+       return (read_c0_cause() >> cp0_compare_irq) & 0x100;
+ }
  
+-/*
+- * Compare interrupt can be routed and latched outside the core,
+- * so a single execution hazard barrier may not be enough to give
+- * it time to clear as seen in the Cause register.  4 time the
+- * pipeline depth seems reasonably conservative, and empirically
+- * works better in configurations with high CPU/bus clock ratios.
+- */
+-
+-#define compare_change_hazard() \
+-      do { \
+-              irq_disable_hazard(); \
+-              irq_disable_hazard(); \
+-              irq_disable_hazard(); \
+-              irq_disable_hazard(); \
+-      } while (0)
+-
+ int c0_compare_int_usable(void)
+ {
+       unsigned int delta;