fa1827d773
One fix for a regression introduced by our 32-bit KASAN support, which broke booting on machines with "bootx" early debugging enabled. A fix for a bug which broke kexec on 32-bit, introduced by changes to the 32-bit STRICT_KERNEL_RWX support in v5.1. Finally two fixes going to stable for our THP split/collapse handling, discovered by Nick. The first fixes random crashes and/or corruption in guests under sufficient load. Thanks to: Nicholas Piggin, Christophe Leroy, Aaro Koskinen, Mathieu Malaterre. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJdBOivAAoJEFHr6jzI4aWA/T0P/1pmr4JLWzXOPQOGOwS2mmu5 HhXBFuDflpGiWS31syOhfKhiE2qlwdIcGaclSo1wAgUnMKp+sxVEagF6DEt484r3 DXs3eRyrGu5vQT7Q6yReuT3Kw2ZR474a5ob00WGAQosBKyJF4ZHWz16ETVWMdAMQ TknEEU3hOUnMWWIEvLnZOKT7eJcmzj5IYy1OtLHBjWiHHizGC8PSxdVhiRcD/O6R F6C7XrFb7RRj5ran6gxwMbcTvjgu922TSQPOCw93qnXYWLfvWDUXC4yCqY21oHnr b3zgJNgIdSoMYxE8pfOH7Y+eaJrbzgnhlS5OJNEz/4NOfGQnJXYcSF8QO6eeVoKM L2SkT1Ov+QMmZQjMC5e9OAe7DFHfM59RYFg11eaUqfiaObRsmwu8rqjngITV5Ede Ydq3W39XQkjB3aQ4qb0MnEBbVgyQ/y6/T5hoHRlvnb5byFk5Pd3jpub56sq87UGM M4GD3YdmT5eBqzGxApddyIiS839PZpdw7g/Ivtp2GYCtiNNZcJqaXvN7IwfcVF3c YJrCfhNTUJPjICIL9k9v2RQovGuGZqtM3BHc8PmyVvDxTqtEbh8B9GEg+QC58xp/ s+UI2sEd/Vg6NVKluIJHau7aEmJlaxYIshqsIhYvPgJRN6KrFMhdfPNx7D+zMlu8 nbM6Z1n2VFk9Cxb0vA9K =MXJI -----END PGP SIGNATURE----- Merge tag 'powerpc-5.2-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc fixes from Michael Ellerman: "One fix for a regression introduced by our 32-bit KASAN support, which broke booting on machines with "bootx" early debugging enabled. A fix for a bug which broke kexec on 32-bit, introduced by changes to the 32-bit STRICT_KERNEL_RWX support in v5.1. Finally two fixes going to stable for our THP split/collapse handling, discovered by Nick. The first fixes random crashes and/or corruption in guests under sufficient load. Thanks to: Nicholas Piggin, Christophe Leroy, Aaro Koskinen, Mathieu Malaterre" * tag 'powerpc-5.2-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/32s: fix booting with CONFIG_PPC_EARLY_DEBUG_BOOTX powerpc/64s: __find_linux_pte() synchronization vs pmdp_invalidate() powerpc/64s: Fix THP PMD collapse serialisation powerpc: Fix kexec failure on book3s/32
91 lines
2 KiB
Bash
91 lines
2 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Copyright © 2008 IBM Corporation
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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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# 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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grep "^CONFIG_KASAN=y$" .config >/dev/null
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if [ $? -eq 0 ]
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then
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MEM_FUNCS="__memcpy __memset"
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else
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MEM_FUNCS="memcpy memset"
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fi
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WHITELIST="add_reloc_offset __bss_start __bss_stop copy_and_flush
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_end enter_prom $MEM_FUNCS reloc_offset __secondary_hold
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__secondary_hold_acknowledge __secondary_hold_spinloop __start
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logo_linux_clut224 btext_prepare_BAT
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reloc_got2 kernstart_addr memstart_addr linux_banner _stext
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__prom_init_toc_start __prom_init_toc_end btext_setup_display TOC."
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NM="$1"
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OBJ="$2"
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ERROR=0
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function check_section()
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{
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file=$1
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section=$2
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size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}")
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size=${size:-0}
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if [ $size -ne 0 ]; then
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ERROR=1
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echo "Error: Section $section not empty in prom_init.c" >&2
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fi
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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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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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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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# ignore register save/restore funcitons
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case $UNDEF in
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_restgpr_*|_restgpr0_*|_rest32gpr_*)
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OK=1
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;;
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_savegpr_*|_savegpr0_*|_save32gpr_*)
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OK=1
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;;
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esac
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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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check_section $OBJ .data
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check_section $OBJ .bss
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check_section $OBJ .init.data
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exit $ERROR
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