# git rev-parse -q --verify 8734b41b3efe0fc6082c1937b0e88556c396dc96^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git fixes-test
warning: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify 8734b41b3efe0fc6082c1937b0e88556c396dc96^{commit}
8734b41b3efe0fc6082c1937b0e88556c396dc96
# git checkout -q -f -B kisskb 8734b41b3efe0fc6082c1937b0e88556c396dc96
# git clean -qxdf
# < git log -1
# commit 8734b41b3efe0fc6082c1937b0e88556c396dc96
# Author: Russell Currey <ruscur@russell.cc>
# Date:   Tue Nov 23 18:15:20 2021 +1000
# 
#     powerpc/module_64: Fix livepatching for RO modules
#     
#     Livepatching a loaded module involves applying relocations through
#     apply_relocate_add(), which attempts to write to read-only memory when
#     CONFIG_STRICT_MODULE_RWX=y.  Work around this by performing these
#     writes through the text poke area by using patch_instruction().
#     
#     R_PPC_REL24 is the only relocation type generated by the kpatch-build
#     userspace tool or klp-convert kernel tree that I observed applying a
#     relocation to a post-init module.
#     
#     A more comprehensive solution is planned, but using patch_instruction()
#     for R_PPC_REL24 on should serve as a sufficient fix.
#     
#     This does have a performance impact, I observed ~15% overhead in
#     module_load() on POWER8 bare metal with checksum verification off.
#     
#     Fixes: c35717c71e98 ("powerpc: Set ARCH_HAS_STRICT_MODULE_RWX")
#     Cc: stable@vger.kernel.org # v5.14+
#     Reported-by: Joe Lawrence <joe.lawrence@redhat.com>
#     Signed-off-by: Russell Currey <ruscur@russell.cc>
#     Tested-by: Joe Lawrence <joe.lawrence@redhat.com>
#     [mpe: Check return codes from patch_instruction()]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20211214121248.777249-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 8734b41b3efe0fc6082c1937b0e88556c396dc96
# < make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-  defconfig
arch/m68k/configs/multi_defconfig:322:warning: symbol value 'm' invalid for MCTP
# < make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig
# make -s -j 48 ARCH=m68k O=/kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/m68k-linux/bin/m68k-linux-  
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_m68k-defconfig_m68k-gcc11
# Build took: 0:04:43.324866