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authorblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2010-11-03 19:02:27 +0000
committerblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2010-11-03 19:02:27 +0000
commit0a2b2965cd687a2be744552b09f4f5cf2fde4c0f (patch)
tree9166127f79cbe0b37ab9b278968529b8ddfef738 /target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch
parentf0efddfaa0c34142a6abbe8ae3de2181f608d710 (diff)
[ifxmips]:
* bump kernel to 2.6.35.8 * merge arcadyn mach files * fixes ar9 * adds hack for tapi drivers git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23836 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch')
-rw-r--r--target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch33
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch b/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch
new file mode 100644
index 0000000000..81eabc6dcd
--- /dev/null
+++ b/target/linux/ifxmips/patches/010-mips_clocksource_init_war.patch
@@ -0,0 +1,33 @@
+--- a/arch/mips/kernel/cevt-r4k.c
++++ b/arch/mips/kernel/cevt-r4k.c
+@@ -22,6 +22,22 @@
+
+ #ifndef CONFIG_MIPS_MT_SMTC
+
++/*
++ * 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)
++
+ static int mips_next_event(unsigned long delta,
+ struct clock_event_device *evt)
+ {
+@@ -31,6 +47,7 @@ static int mips_next_event(unsigned long
+ cnt = read_c0_count();
+ cnt += delta;
+ write_c0_compare(cnt);
++ compare_change_hazard();
+ res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0;
+ return res;
+ }