#!/bin/sh
# merge_config.sh - Takes a list of config fragment values, and merges
# them one by one. Provides warnings on overridden values, and specified
# values that did not make it to the resulting .config file (due to missed
# dependencies or config symbol removal).
#
# Portions reused from kconf_check and generate_cfg:
# http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/kconf_check
# http://git.yoctoproject.org/cgit/cgit.cgi/yocto-kernel-tools/tree/tools/generate_cfg
#
# Copyright (c) 2009-2010 Wind River Systems, Inc.
# Copyright 2011 Linaro
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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.
clean_up() {
rm -f $TMP_FILE
exit
}
trap clean_up HUP INT TERM
usage() {
echo "Usage: $0 [OPTIONS] [CONFIG [...]]"
echo " -h display this help text"
echo " -m only merge the fragments, do not execute the make command"
echo " -n use allnoconfig instead of alldefconfig"
echo " -r list redundant entries when merging fragments"
echo " -O dir to put generated output files. Consider setting \$KCONFIG_CONFIG instead."
}
RUNMAKE=true
ALLTARGET=alldefconfig
WARNREDUN=false
OUTPUT=.
while true; do
case $1 in
"-n")
ALLTARGET=allnoconfig
shift
continue
;;
"-m")
RUNMAKE=false
shift
continue
;;
"-h")
usage
exit
;;
"-r")
WARNREDUN=true
shift
continue
;;
"-O")
if [ -d $2 ];then
OUTPUT=$(echo $2 | sed 's/\/*$//')
else
echo "output directory $2 does not exist" 1>&2
exit 1
fi
shift 2
continue
;;
*)
break
;;
esac
done
if [ "$#" -lt 1 ] ; then
usage
exit
fi
if [ -z "$KCONFIG_CONFIG" ]; then
if [ "$OUTPUT" != . ]; then
KCONFIG_CONFIG=$(readlink -m -- "$OUTPUT/.config")
else
KCONFIG_CONFIG=.config
fi
fi
INITFILE=$1
shift;
if [ ! -r "$INITFILE" ]; then
echo "The base file '$INITFILE' does not exist. Exit." >&2
exit 1
fi
MERGE_LIST=$*
SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
echo "Using $INITFILE as base"
cat $INITFILE > $TMP_FILE
# Merge files, printing warnings on overridden values
for MERGE_FILE in $MERGE_LIST ; do
echo "Merging $MERGE_FILE"
if [ ! -r "$MERGE_FILE" ]; then
echo "The merge file '$MERGE_FILE' does not exist. Exit." >&2
exit 1
fi
CFG_LIST=$(sed -n "$SED_CONFIG_EXP" $MERGE_FILE)
for CFG in $CFG_LIST ; do
grep -q -w $CFG $TMP_FILE || continue
PREV_VAL=$(grep -w $CFG $TMP_FILE)
NEW_VAL=$(grep -w $CFG $MERGE_FILE)
if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
echo Value of $CFG is redefined by fragment $MERGE_FILE:
echo Previous value: $PREV_VAL
echo New value: $NEW_VAL
echo
elif [ "$WARNREDUN" = "true" ]; then
echo Value of $CFG is redundant by fragment $MERGE_FILE:
fi
sed -i "/$CFG[ =]/d" $TMP_FILE
done
cat $MERGE_FILE >> $TMP_FILE
done
if [ "$RUNMAKE" = "false" ]; then
cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
echo "#"
echo "# merged configuration written to $KCONFIG_CONFIG (needs make)"
echo "#"
clean_up
exit
fi
# If we have an output dir, setup the O= argument, otherwise leave
# it blank, since O=. will create an unnecessary ./source softlink
OUTPUT_ARG=""
if [ "$OUTPUT" != "." ] ; then
OUTPUT_ARG="O=$OUTPUT"
fi
# Use the merged file as the starting point for:
# alldefconfig: Fills in any missing symbols with Kconfig default
# allnoconfig: Fills in any missing symbols with # CONFIG_* is not set
make KCONFIG_ALLCONFIG=$TMP_FILE $OUTPUT_ARG $ALLTARGET
# Check all specified config values took (might have missed-dependency issues)
for CFG in $(sed -n "$SED_CONFIG_EXP" $TMP_FILE); do
REQUESTED_VAL=$(grep -w -e "$CFG" $TMP_FILE)
ACTUAL_VAL=$(grep -w -e "$CFG" "$KCONFIG_CONFIG")
if [ "x$REQUESTED_VAL" != "x$ACTUAL_VAL" ] ; then
echo "Value requested for $CFG not in final .config"
echo "Requested value: $REQUESTED_VAL"
echo "Actual value: $ACTUAL_VAL"
echo ""
fi
done
clean_up
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of
the root of the PCIe hierarchy. For the topmost link, this points to
itself (link->root = link). For others, we copy the pointer from the
parent (link->root = link->parent->root).
Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link->parent->root,
there was no parent, and we dereferenced a NULL pointer:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820
Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link->root for these devices should also point to
itself.
Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. <jnair@caviumnetworks.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.2+