xen/Kconfig: Correct the NR_CPUS description

The description "physical CPUs" is especially wrong, as it implies the number
of sockets, which tops out at 8 on all but the very biggest servers.

NR_CPUS is the number of logical entities the scheduler can use.

Reported-by: hanetzer@startmail.com
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig
index 1954d1c5c133b1e9b76fc14cb438831e266026a3..d144d4c8d3ee4fe6a91a30e43b43a2237f29b60c 100644 (file)
--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -1,11 +1,17 @@
 
 config NR_CPUS
-       int "Maximum number of physical CPUs"
+       int "Maximum number of CPUs"
        range 1 4095
        default "256" if X86
        default "8" if ARM && RCAR3
        default "4" if ARM && QEMU
        default "4" if ARM && MPSOC
        default "128" if ARM
-       ---help---
-         Specifies the maximum number of physical CPUs which Xen will support.
+       help
+         Controls the build-time size of various arrays and bitmaps
+         associated with multiple-cpu management.  It is the upper bound of
+         the number of logical entities the scheduler can run code on.
+
+         For CPU cores which support Simultaneous Multi-Threading or similar
+         technologies, this the number of logical threads which Xen will
+         support.