# git rev-parse -q --verify b03897cf318dfc47de33a7ecbc7655584266f034^{commit}
b03897cf318dfc47de33a7ecbc7655584266f034
already have revision, skipping fetch
# git checkout -q -f -B kisskb b03897cf318dfc47de33a7ecbc7655584266f034
# git clean -qxdf
# < git log -1
# commit b03897cf318dfc47de33a7ecbc7655584266f034
# Author: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
# Date:   Wed Jul 18 14:03:16 2018 +0530
# 
#     powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle)
#     
#     On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror
#     SPRN_USPRG3 are used as userspace VDSO write and read registers
#     respectively.
#     
#     SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not
#     restored.  As a result, any read from SPRN_USPRG3 returns zero on an
#     exit from stop4 (Power9 only) and above.
#     
#     Thus in this situation, on POWER9, any call from sched_getcpu() always
#     returns zero, as on powerpc, we call __kernel_getcpu() which relies
#     upon SPRN_USPRG3 to report the CPU and NUMA node information.
#     
#     Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state
#     with the sprg_vdso value that is cached in PACA.
#     
#     Fixes: e1c1cfed5432 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle")
#     Cc: stable@vger.kernel.org # v4.14+
#     Reported-by: Florian Weimer <fweimer@redhat.com>
#     Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
#     Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 b03897cf318dfc47de33a7ecbc7655584266f034
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+kexec_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# Added to kconfig configs/2006/11/29/pmac32_defconfigkexec
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+kexec_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+kexec_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
/kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter.
In file included from /kisskb/src/sound/ppc/pmac.h:25:0,
                 from /kisskb/src/sound/ppc/awacs.c:29:
/kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return _snd_ctl_add_slave(master, slave, 0);
         ^
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
  struct snd_kcontrol *master_vol, *speaker_vol;
                                    ^
INFO: Uncompressed kernel (size 0x8a44a4) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x900000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pmac32_defconfig+kexec_powerpc-5.3
# Build took: 0:01:24.773228