From: Jan Beulich Date: Mon, 24 May 2010 19:13:17 +0000 (-0700) Subject: x86: "nosmp" command line option should force the system into UP mode X-Git-Tag: v2.6.35-rc1~11^2~6 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f2eb55026c91f8400ab4469aff88b2e201b5616;p=pandora-kernel.git x86: "nosmp" command line option should force the system into UP mode Bits set in cpu_possible_mask prior to the execution of prefill_possible_map() (i.e. when parsing ACPI or MPS tables) would prevent the SMP alternatives logic from switching to UP mode, plus unnecessary setup of per-CPU data for CPUs that can never come online. Additionally, without CONFIG_HOTPLUG_CPU disabled CPUs can never come online, and hence setting cpu_possible_mask bits for them is again a simple waste of resources. Signed-off-by: Jan Beulich LKML-Reference: <201005241913.o4OJDH3Z010874@imap1.linux-foundation.org> Signed-off-by: Andrew Morton Signed-off-by: H. Peter Anvin --- Reading git-diff-tree failed