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author | Hauke Mehrtens <hauke@hauke-m.de> | 2012-05-13 15:10:40 +0000 |
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committer | Hauke Mehrtens <hauke@hauke-m.de> | 2012-05-13 15:10:40 +0000 |
commit | abd74f86b459f4ac684de4a0f1bf6552d14b105a (patch) | |
tree | 5e6a8d954a21071671d2dc346bc97c6bb0d8ec3c /target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch | |
parent | 2803206c500fd09cbcb926e9cba7b19b5ae0d9f2 (diff) | |
download | master-31e0f0ae-abd74f86b459f4ac684de4a0f1bf6552d14b105a.tar.gz master-31e0f0ae-abd74f86b459f4ac684de4a0f1bf6552d14b105a.tar.bz2 master-31e0f0ae-abd74f86b459f4ac684de4a0f1bf6552d14b105a.zip |
amazon: update amazon target to kernel 3.3
This is just compile tested, my device is currently not working.
SVN-Revision: 31706
Diffstat (limited to 'target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch')
-rw-r--r-- | target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch b/target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch new file mode 100644 index 0000000000..7078b37437 --- /dev/null +++ b/target/linux/amazon/patches-3.3/010-mips_clocksource_init_war.patch @@ -0,0 +1,33 @@ +--- a/arch/mips/kernel/cevt-r4k.c ++++ b/arch/mips/kernel/cevt-r4k.c +@@ -23,6 +23,22 @@ + + #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) + { +@@ -32,6 +48,7 @@ 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; + } |