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authorLinus Torvalds <torvalds@woody.osdl.org>2007-01-08 15:04:46 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2007-01-08 15:04:46 -0800
commitfea5f1e19611d94fbf3905875a427c4cb959cd06 (patch)
tree5a4c0584eea3ba74745e836e370fa1bbd0dacb02 /Documentation/x86_64
parentbf81b46482c0fa8ea638e409d39768ea92a6b0f0 (diff)
downloadop-kernel-dev-fea5f1e19611d94fbf3905875a427c4cb959cd06.zip
op-kernel-dev-fea5f1e19611d94fbf3905875a427c4cb959cd06.tar.gz
Revert "[PATCH] x86-64: Try multiple timer variants in check_timer"
This reverts commit b026872601976f666bae77b609dc490d1834bf77, which has been linked to several problem reports with IO-APIC and the timer. Machines either don't boot because the timer doesn't happen, or we get double timer interrupts because we end up double-routing the timer irq through multiple interfaces. See for example http://lkml.org/lkml/2006/12/16/101 http://lkml.org/lkml/2007/1/3/9 http://bugzilla.kernel.org/show_bug.cgi?id=7789 about some of the discussion. Patches to fix this cleanup exist (and have been confirmed to work fine at least for some of the affected cases) and we'll revisit it for 2.6.21, but this late in the -rc series we're better off just reverting the incomplete commit that caused the problems. Suggested-by: Adrian Bunk <bunk@stusta.de> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Yinghai Lu <yinghai.lu@amd.com> Cc: Andrew Morton <akpm@osdl.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/x86_64')
-rw-r--r--Documentation/x86_64/boot-options.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index dbdcaf6..5c86ed6 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -52,6 +52,10 @@ APICs
apicmaintimer. Useful when your PIT timer is totally
broken.
+ disable_8254_timer / enable_8254_timer
+ Enable interrupt 0 timer routing over the 8254 in addition to over
+ the IO-APIC. The kernel tries to set a sensible default.
+
Early Console
syntax: earlyprintk=vga
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