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+#!/bin/sh
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+#
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+# Copyright © 2008 IBM Corporation
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+#
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+# This program is free software; you can redistribute it and/or
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+# modify it under the terms of the GNU General Public License
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+# as published by the Free Software Foundation; either version
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+# 2 of the License, or (at your option) any later version.
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+
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+# This script checks prom_init.o to see what external symbols it
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+# is using, if it finds symbols not in the whitelist it returns
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+# an error. The point of this is to discourage people from
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+# intentionally or accidentally adding new code to prom_init.c
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+# which has side effects on other parts of the kernel.
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+
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+# If you really need to reference something from prom_init.o add
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+# it to the list below:
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+
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+WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
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+_end enter_prom memcpy memset reloc_offset __secondary_hold
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+__secondary_hold_acknowledge __secondary_hold_spinloop __start
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+strcmp strcpy strlcpy strlen strncmp strstr logo_linux_clut224
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+reloc_got2"
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+
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+NM="$1"
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+OBJ="$2"
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+
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+ERROR=0
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+
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+for UNDEF in $($NM -u $OBJ | awk '{print $2}')
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+do
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+ # On 64-bit nm gives us the function descriptors, which have
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+ # a leading . on the name, so strip it off here.
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+ UNDEF="${UNDEF#.}"
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+
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+ if [ $KBUILD_VERBOSE ]; then
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+ if [ $KBUILD_VERBOSE -ne 0 ]; then
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+ echo "Checking prom_init.o symbol '$UNDEF'"
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+ fi
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+ fi
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+
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+ OK=0
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+ for WHITE in $WHITELIST
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+ do
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+ if [ "$UNDEF" = "$WHITE" ]; then
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+ OK=1
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+ break
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+ fi
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+ done
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+
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+ if [ $OK -eq 0 ]; then
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+ ERROR=1
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+ echo "Error: External symbol '$UNDEF' referenced" \
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+ "from prom_init.c" >&2
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+ fi
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+done
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+
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+exit $ERROR
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