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| author | Ashok Raj <ashok.raj@intel.com> | 2006-04-27 18:39:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-28 08:33:47 -0700 |
| commit | 35076bdfa171cd83d89fcb96568e786f0da91d9f (patch) | |
| tree | 52057bed0ad54c5b6d10e0da56c56f1233d71a44 /arch | |
| parent | 7f5910ecabd3a36b9c06f73e33b673ccf150f3b4 (diff) | |
| download | linux-stable-35076bdfa171cd83d89fcb96568e786f0da91d9f.tar.gz linux-stable-35076bdfa171cd83d89fcb96568e786f0da91d9f.tar.bz2 linux-stable-35076bdfa171cd83d89fcb96568e786f0da91d9f.zip | |
[PATCH] enable X86_PC for HOTPLUG_CPU
CPU_HOTPLUG has race conditions when we use broadcast mode IPI.
- First we introduced no_broadcast option
(see include/asm-i386/mach-default/mach_ipi.h)
- x86_64 solved it by using physical flat mode (same as bigsmp on i386)
since this will not use broadcast shortcuts for IPI.
- We switched to use bigsmp on i386 so that we can have same handling as
x86_64, but apparently this caused an error message, if kernel was
compiled without X86_GENERICARCH, X86_BIGSMP. The message "You have >8
CPUS..." which was bogus and misleading, and only indicated one of the
above ARCH wasnt selected.
So we do not switch to automatic bigsmp for HOTPLUG_CPU support in i386
until the other related config dependencies for SMP_SUSPEND etc can be done
right.
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index 18ec9fe6deb6..366b401c1f29 100644 --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig @@ -756,7 +756,7 @@ config PHYSICAL_START config HOTPLUG_CPU bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" - depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER && !X86_PC + depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER ---help--- Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. |