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authorAshok Raj <ashok.raj@intel.com>2006-03-25 03:06:50 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 08:22:50 -0800
commitd3f4aaa3d7b4152dac28751ee902f769d03289a1 (patch)
tree66c5313a705a5169b2c5cc12b703489c39b8ee52
parentf5335c0f1bcba16907972b66b905f62402433e23 (diff)
[PATCH] x86: make CONFIG_HOTPLUG_CPU depend on !X86_PC
Make CONFIG_HOTPLUG_CPU depend on !X86_PC, so we need to turn on either CONFIG_GENERICARCH, CONFIG_BIGSMP or any other subarch except X86_PC when CONFIG_HOTPLUG_CPU=y With 2.6.15+ kernels when CONFIG_HOTPLUG_CPU is turned on we switch to bigsmp mode for sending IPI's and ioapic configurations that caused the following error message. >> More than 8 CPUs detected and CONFIG_X86_PC cannot handle it. >> Use CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP. Originally bigsmp was added just to handle >8 cpus, but now with hotplug cpu support we need to use bigsmp mode (why? see below), that cause the above error message even if there were less than 8 cpus in the system. The message is bogus, but we are cannot use logical flat mode due to issues with broadcast IPI can confuse a CPU just comming up. We use flat physical mode just like x86_64 case. More details on why bigsmp now uses flat physical mode (vs. cluster mode) in following link. http://marc.theaimsgroup.com/?l=linux-kernel&m=113261865814107&w=2 Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index bfea1bedcbf..b008fb0cd7b 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -737,7 +737,7 @@ config PHYSICAL_START
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
- depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
+ depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER && !X86_PC
---help---
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu.