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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2006-02-17 13:52:48 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-17 13:59:27 -0800 |
| commit | 54330456b2e3398743586254f6d7695061ea0d49 (patch) | |
| tree | 1527f8c2a5ff6247e88b73f6529b2b6b7aa9d724 /drivers | |
| parent | [PATCH] s390: possible_cpus parameter (diff) | |
| download | linux-dev-54330456b2e3398743586254f6d7695061ea0d49.tar.xz linux-dev-54330456b2e3398743586254f6d7695061ea0d49.zip | |
[PATCH] s390: smp initialization speed
The last changes that introduced the additional_cpus command line parameter
also introduced a regression regarding smp initialization speed. In
smp_setup_cpu_possible_map() cpu_present_map is set to the same value as
cpu_possible_map. Especially that means that bits in the present map will be
set for cpus that are not present. This will cause a slow down in the initial
cpu_up() loop in smp_init() since trying to take cpus online that aren't
present takes a while.
Fix this by setting only bits for present cpus in cpu_present_map and set
cpu_present_map to cpu_possible_map in smp_cpus_done().
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions