# git rev-parse -q --verify e6037a753e8e9a4146f7d94c32eb30a6717c9c70^{commit}
e6037a753e8e9a4146f7d94c32eb30a6717c9c70
already have revision, skipping fetch
# git checkout -q -f -B kisskb e6037a753e8e9a4146f7d94c32eb30a6717c9c70
# git clean -qxdf
# < git log -1
# commit e6037a753e8e9a4146f7d94c32eb30a6717c9c70
# Author: Jason A. Donenfeld <Jason@zx2c4.com>
# Date:   Thu Oct 15 01:02:09 2020 +0200
# 
#     powerpc32: don't adjust unmoved stack pointer in csum_partial_copy_generic() epilogue
#     
#     A recent change to the checksum code removed usage of some extra
#     arguments, alongside with storage on the stack for those, and the stack
#     pointer no longer needed to be adjusted in the function prologue.
#     
#     But a left over subtraction wasn't removed in the function epilogue,
#     causing the function to return with the stack pointer moved 16 bytes
#     away from where it should have.  This corrupted local state and lead to
#     weird crashes.
#     
#     This simply removes the leftover instruction from the epilogue.
#     
#     Fixes: 70d65cd555c5 ("ppc: propagate the calling conventions change down to csum_partial_copy_generic()")
#     Cc: Al Viro <viro@zeniv.linux.org.uk>
#     Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 e6037a753e8e9a4146f7d94c32eb30a6717c9c70
# < make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  randconfig
KCONFIG_SEED=0x5E5C7A5A
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# yes \n | make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 10 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  
kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x18f7: call without frame pointer save/setup
vmlinux.o: warning: objtool: do_machine_check()+0x95b: call to mce_panic() leaves .noinstr.text section
vmlinux.o: warning: objtool: lock_is_held_type()+0x67: call to check_flags() leaves .noinstr.text section
arch/x86/tools/insn_decoder_test: success: Decoded and checked 5426556 instructions
arch/x86/tools/insn_sanity: Success: decoded and checked 1000000 random instructions with 0 errors (seed:0xdbbf1456)
Completed OK
# rm -rf /kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8
# Build took: 0:06:46.509144