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| author | David S. Miller | 2007-05-26 10:14:43 +0200 |
|---|---|---|
| committer | David S. Miller | 2007-05-29 11:49:49 +0200 |
| commit | 22adb358e816ce6aa0afb231ae9d826b0bddc8b0 (patch) | |
| tree | 6f9886bf5b4e5c916c72d8d5733211813873c5fc /arch/sparc64/Kconfig | |
| parent | [SPARC64]: Use machine description and OBP properly for cpu probing. (diff) | |
| download | kernel-qcow2-linux-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.tar.gz kernel-qcow2-linux-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.tar.xz kernel-qcow2-linux-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.zip | |
[SPARC64]: Eliminate NR_CPUS limitations.
Cheetah systems can have cpuids as large as 1023, although physical
systems don't have that many cpus.
Only three limitations existed in the kernel preventing arbitrary
NR_CPUS values:
1) dcache dirty cpu state stored in page->flags on
D-cache aliasing platforms. With some build time
calculations and some build-time BUG checks on
page->flags layout, this one was easily solved.
2) The cheetah XCALL delivery code could only handle
a cpumask with up to 32 cpus set. Some simple looping
logic clears that up too.
3) thread_info->cpu was a u8, easily changed to a u16.
There are a few spots in the kernel that still put NR_CPUS
sized arrays on the kernel stack, but that's not a sparc64
specific problem.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/Kconfig')
| -rw-r--r-- | arch/sparc64/Kconfig | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig index 831781cab271..bd00f89eed1e 100644 --- a/arch/sparc64/Kconfig +++ b/arch/sparc64/Kconfig @@ -147,10 +147,10 @@ config SMP If you don't know what to do here, say N. config NR_CPUS - int "Maximum number of CPUs (2-64)" - range 2 64 + int "Maximum number of CPUs (2-1024)" + range 2 1024 depends on SMP - default "32" + default "64" source "drivers/cpufreq/Kconfig" |