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| author | David S. Miller <davem@sunset.davemloft.net> | 2007-05-26 01:14:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-05-29 02:49:49 -0700 |
| commit | 22adb358e816ce6aa0afb231ae9d826b0bddc8b0 (patch) | |
| tree | 6f9886bf5b4e5c916c72d8d5733211813873c5fc /arch/sparc64/kernel/head.S | |
| parent | 5cbc30737398b49f62ae8603129ce43ac7db1a41 (diff) | |
| download | lwn-22adb358e816ce6aa0afb231ae9d826b0bddc8b0.tar.gz lwn-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/kernel/head.S')
| -rw-r--r-- | arch/sparc64/kernel/head.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S index baea10a98196..5c11529742d4 100644 --- a/arch/sparc64/kernel/head.S +++ b/arch/sparc64/kernel/head.S @@ -523,7 +523,7 @@ tlb_fixup_done: #else mov 0, %o0 #endif - stb %o0, [%g6 + TI_CPU] + sth %o0, [%g6 + TI_CPU] /* Off we go.... */ call start_kernel |