path: root/Documentation
diff options
authorHeiko Carstens <>2006-02-17 13:52:47 -0800
committerLinus Torvalds <>2006-02-17 13:59:27 -0800
commit37a3302618a51520e2056494715ea6b4776dd8ab (patch)
tree379fd117bb816fd012dd58ba9c900e20792a8ae3 /Documentation
parent255acee706b333b79f593dd366f16e1f107cccc3 (diff)
[PATCH] s390: possible_cpus parameter
Introduce possible_cpus command line option. Hard sets the number of bits set in cpu_possible_map. Unlike the additional_cpus parameter this one guarantees that num_possible_cpus() will stay constant even if the system gets rebooted and a different number of cpus are present at startup. Signed-off-by: Heiko Carstens <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'Documentation')
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index 4d3355da0e26..e71bc6cbbc5e 100644
--- a/Documentation/cpu-hotplug.txt
+++ b/Documentation/cpu-hotplug.txt
@@ -58,6 +58,12 @@ mark such hot-pluggable cpus as disabled entries, one could use this
parameter "additional_cpus=x" to represent those cpus in the cpu_possible_map.
+possible_cpus=n [s390 only] use this to set hotpluggable cpus.
+ This option sets possible_cpus bits in
+ cpu_possible_map. Thus keeping the numbers of bits set
+ constant even if the machine gets rebooted.
+ This option overrides additional_cpus.
CPU maps and such
[More on cpumaps and primitive to manipulate, please check