#!/bin/bash
#
# Extract the number of CPUs expected from the specified Kconfig-file
# fragment by checking CONFIG_SMP and CONFIG_NR_CPUS.  If the specified
# file gives no clue, base the number on the number of idle CPUs on
# the system.
#
# Usage: configNR_CPUS.sh config-frag
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (C) IBM Corporation, 2013
#
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

global cf := $1
if test ! -r $cf
{
	echo Unreadable config fragment $cf !1 > !2
	exit -1
}
if grep -q '^CONFIG_SMP=n$' $cf
{
	echo 1
	exit 0
}
if grep -q '^CONFIG_NR_CPUS=' $cf
{
	grep '^CONFIG_NR_CPUS=' $cf | 
		sed -e 's/^CONFIG_NR_CPUS=\([0-9]*\).*$/\1/'
	exit 0
}
cpus2use.sh
(CommandList
  children: [
    (Assignment
      keyword: Assign_None
      pairs: [(assign_pair lhs:(LhsName name:cf) op:Equal rhs:{($ VSub_Number "$1")} spids:[79])]
      spids: [79]
    )
    (If
      arms: [
        (if_arm
          cond: [(C {(test)} {(KW_Bang "!")} {(-r)} {($ VSub_Name "$cf")})]
          action: [
            (SimpleCommand
              words: [{(echo)} {(Unreadable)} {(config)} {(fragment)} {($ VSub_Name "$cf")}]
              redirects: [(Redir op_id:Redir_GreatAnd fd:1 arg_word:{(2)} spids:[105])]
            )
            (C {(exit)} {(-1)})
          ]
          spids: [-1 92]
        )
      ]
      spids: [-1 113]
    )
    (If
      arms: [
        (if_arm
          cond: [(C {(grep)} {(-q)} {(SQ <"^CONFIG_SMP=n$">)} {($ VSub_Name "$cf")})]
          action: [(C {(echo)} {(1)}) (C {(exit)} {(0)})]
          spids: [-1 127]
        )
      ]
      spids: [-1 139]
    )
    (If
      arms: [
        (if_arm
          cond: [(C {(grep)} {(-q)} {(SQ <"^CONFIG_NR_CPUS=">)} {($ VSub_Name "$cf")})]
          action: [
            (Pipeline
              children: [
                (C {(grep)} {(SQ <"^CONFIG_NR_CPUS=">)} {($ VSub_Name "$cf")})
                (C {(sed)} {(-e)} {(SQ <"s/^CONFIG_NR_CPUS=\\([0-9]*\\).*$/\\1/">)})
              ]
              negated: False
            )
            (C {(exit)} {(0)})
          ]
          spids: [-1 153]
        )
      ]
      spids: [-1 181]
    )
    (C {(cpus2use.sh)})
  ]
)