The patch titled
enable X86_PC for HOTPLUG_CPU
has been removed from the -mm tree. Its filename is
enable-x86_pc-for-hotplug_cpu.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
From: Ashok Raj <ashok.raj@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/Kconfig | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/i386/Kconfig~enable-x86_pc-for-hotplug_cpu arch/i386/Kconfig
--- devel/arch/i386/Kconfig~enable-x86_pc-for-hotplug_cpu 2006-04-27 18:39:04.000000000 -0700
+++ devel-akpm/arch/i386/Kconfig 2006-04-27 18:39:04.000000000 -0700
@@ -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.
_
Patches currently in -mm which might be from ashok.raj@xxxxxxxxx are
origin.patch
git-acpi.patch
x86-cpu_init-avoid-gfp_kernel-allocation-while-atomic.patch
support-physical-cpu-hotplug-for-x86_64.patch
kernel-kernel-cpuc-to-mutexes.patch
-
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