# git rev-parse -q --verify ebda7e3c2ebb244682d068c7d9ad8ad25404295a^{commit}
ebda7e3c2ebb244682d068c7d9ad8ad25404295a
already have revision, skipping fetch
# git checkout -q -f -B kisskb ebda7e3c2ebb244682d068c7d9ad8ad25404295a
# git clean -qxdf
# < git log -1
# commit ebda7e3c2ebb244682d068c7d9ad8ad25404295a
# Author: Breno Leitao <leitao@debian.org>
# Date:   Tue Jan 8 09:31:21 2019 -0200
# 
#     selftests/powerpc: New TM signal self test
#     
#     A new self test that forces MSR[TS] to be set without calling any TM
#     instruction. This test also tries to cause a page fault at a signal
#     handler, exactly between MSR[TS] set and tm_recheckpoint(), forcing
#     thread->texasr to be rewritten with TEXASR[FS] = 0, which will cause a BUG
#     when tm_recheckpoint() is called.
#     
#     This test is not deterministic, since it is hard to guarantee that the page
#     access will cause a page fault. In order to force more page faults at
#     signal context, the signal handler and the ucontext are being mapped into a
#     MADV_DONTNEED memory chunks.
#     
#     Tests have shown that the bug could be exposed with few interactions in a
#     buggy kernel. This test is configured to loop 5000x, having a good chance
#     to hit the kernel issue in just one run.  This self test takes less than
#     two seconds to run.
#     
#     This test uses set/getcontext because the kernel will recheckpoint
#     zeroed structures, causing the test to segfault, which is undesired because
#     the test needs to rerun, so, there is a signal handler for SIGSEGV which
#     will restart the test.
#     
#     v2: Uses the MADV_DONTNEED memory advice
#     v3: Fix memcpy and 32-bits compilation
#     v4: Does not define unused macros
#     
#     Signed-off-by: Breno Leitao <leitao@debian.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /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 ebda7e3c2ebb244682d068c7d9ad8ad25404295a
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_walnut_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/walnut_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_40x_walnut_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:883: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x4afc1c) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Completed OK
# rm -rf /kisskb/build/powerpc-next_40x_walnut_defconfig_powerpc-gcc5
# Build took: 0:00:38.459652