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authorTony Luck <tony.luck@intel.com>2006-02-07 15:25:57 -0800
committerTony Luck <tony.luck@intel.com>2006-02-07 15:25:57 -0800
commitd6e56a2a088935f3c1feee5ff5a06c67f2ec6002 (patch)
treeab9fd17a56f81a7662aab8f135be7ed0f3c707c5 /arch/ia64/kernel/head.S
parent9d78f43d1fd3e028bfd37510ce847d0896f71f78 (diff)
downloadop-kernel-dev-d6e56a2a088935f3c1feee5ff5a06c67f2ec6002.zip
op-kernel-dev-d6e56a2a088935f3c1feee5ff5a06c67f2ec6002.tar.gz
[IA64] Fix CONFIG_PRINTK_TIME
There were two problems with enabling the PRINTK_TIME config option: 1) The first calls to printk() occur before per-cpu data virtual address is pinned into the TLB, so sched_clock() can fault. 2) sched_clock() is based on ar.itc, which may not be synchronized across cpus. Ken Chen started this patch, Tony Luck tinkered with it, and Jes Sorensen perfected it. Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/head.S')
-rw-r--r--arch/ia64/kernel/head.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index fbc7ea3..f1778a8 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -352,6 +352,7 @@ start_ap:
mov ar.rsc=0 // place RSE in enforced lazy mode
;;
loadrs // clear the dirty partition
+ mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
;;
mov ar.bspstore=r2 // establish the new RSE stack
;;
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