# git rev-parse -q --verify 4399efc3f2f04ad8e6948461795de04ed1358402^{commit}
4399efc3f2f04ad8e6948461795de04ed1358402
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4399efc3f2f04ad8e6948461795de04ed1358402
# git clean -qxdf
# < git log -1
# commit 4399efc3f2f04ad8e6948461795de04ed1358402
# Author: Gustavo Luiz Duarte <gustavold@linux.ibm.com>
# Date:   Mon Feb 3 13:09:06 2020 -0300
# 
#     selftests/powerpc: Don't rely on segfault to rerun the test
#     
#     The test case tm-signal-context-force-tm expects a segfault to happen on
#     returning from signal handler, and then does a setcontext() to run the test
#     again. However, the test doesn't always segfault, causing the test to run a
#     single time.
#     
#     This patch fixes the test by putting it within a loop and jumping, via
#     setcontext, just prior to the loop in case it segfaults. This way we get the
#     desired behavior (run the test COUNT_MAX times) regardless if it segfaults or
#     not. This also reduces the use of setcontext for control flow logic, keeping it
#     only in the segfault handler.
#     
#     Also, since 'count' is changed within the signal handler, it is declared as
#     volatile to prevent any compiler optimization getting confused with
#     asynchronous changes.
#     
#     Signed-off-by: Gustavo Luiz Duarte <gustavold@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200203160906.24482-3-gustavold@linux.ibm.com
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 4399efc3f2f04ad8e6948461795de04ed1358402
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/ep405_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_40x.S:802: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x536774) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-gcc5
# Build took: 0:00:43.930073