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authorLinus Torvalds <torvalds@g5.osdl.org>2006-02-27 23:41:56 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-27 23:41:56 -0500
commit637029c6cb5efcbaa3d5831af4c1972bdd629779 (patch)
treecd6d32dceef73f0ad467f495f51f331a459d01db /arch/x86_64
parentd4f0f122ec407bd1b4d1c773d0c87edc6a92cd26 (diff)
Revert "[PATCH] x86_64: Only do the clustered systems have unsynchronized TSC assumption on IBM systems"
This reverts commit 13a229abc25640813f1480c0478dfc6bdbc1c19e. Quoth Andi: "After some consideration and feedback from various people it turns out this wasn't that good an idea. It has some problems and needs more work. Since it was only an optimization anyways it's best to just back it out again for now." Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/apic.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index d70605eda333..e5b14c57eaa0 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -962,14 +962,12 @@ void smp_apic_timer_interrupt(struct pt_regs *regs)
962 irq_exit(); 962 irq_exit();
963} 963}
964 964
965int __initdata unsync_tsc_on_multicluster;
966
967/* 965/*
968 * oem_force_hpet_timer -- force HPET mode for some boxes. 966 * oem_force_hpet_timer -- force HPET mode for some boxes.
969 * 967 *
970 * Thus far, the major user of this is IBM's Summit2 series: 968 * Thus far, the major user of this is IBM's Summit2 series:
971 * 969 *
972 * Some clustered boxes may have unsynced TSC problems if they are 970 * Clustered boxes may have unsynced TSC problems if they are
973 * multi-chassis. Use available data to take a good guess. 971 * multi-chassis. Use available data to take a good guess.
974 * If in doubt, go HPET. 972 * If in doubt, go HPET.
975 */ 973 */
@@ -979,11 +977,6 @@ __cpuinit int oem_force_hpet_timer(void)
979 unsigned id; 977 unsigned id;
980 DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); 978 DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS);
981 979
982 /* Only do this check on IBM machines - big Unisys systems
983 use multiple clusters too, but have synchronized TSC */
984 if (!unsync_tsc_on_multicluster)
985 return 0;
986
987 bitmap_zero(clustermap, NUM_APIC_CLUSTERS); 980 bitmap_zero(clustermap, NUM_APIC_CLUSTERS);
988 981
989 for (i = 0; i < NR_CPUS; i++) { 982 for (i = 0; i < NR_CPUS; i++) {