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authorAndi Kleen <ak@suse.de>2006-02-03 15:50:50 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-04 19:43:13 -0500
commit73dea47faeb96d54a984b9d7f4de564816966354 (patch)
tree6b1f090e9071e281367bc106c1b2ab05cb43e459 /include/asm-x86_64/apic.h
parent76b461c21468f41837283b7888d55f1c0671f719 (diff)
[PATCH] x86_64: Allow to run main time keeping from the local APIC interrupt
Another piece from the no-idle-tick patch. This can be enabled with the "apicmaintimer" option. This is mainly useful when the PIT/HPET interrupt is unreliable. Note there are some systems that are known to stop the APIC timer in C3. For those it will never work, but this case should be automatically detected. It also only works with PM timer right now. When HPET is used the way the main timer handler computes the delay doesn't work. It should be a bit more efficient because there is one less regular interrupt to process on the boot processor. Requires earlier bugfix from Venkatesh Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/apic.h')
-rw-r--r--include/asm-x86_64/apic.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h
index 4f6a4dc455bb..bdbd8935612a 100644
--- a/include/asm-x86_64/apic.h
+++ b/include/asm-x86_64/apic.h
@@ -17,6 +17,7 @@
17#define APIC_DEBUG 2 17#define APIC_DEBUG 2
18 18
19extern int apic_verbosity; 19extern int apic_verbosity;
20extern int apic_runs_main_timer;
20 21
21/* 22/*
22 * Define the default level of output to be very little 23 * Define the default level of output to be very little