# git rev-parse -q --verify f460772291f8171988b2b60141a45706123d0c69^{commit}
f460772291f8171988b2b60141a45706123d0c69
already have revision, skipping fetch
# git checkout -q -f -B kisskb f460772291f8171988b2b60141a45706123d0c69
# git clean -qxdf
# < git log -1
# commit f460772291f8171988b2b60141a45706123d0c69
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Sun Dec 30 14:05:13 2018 +1100
# 
#     KVM: PPC: Book3S HV: radix: Fix uninitialized var build error
#     
#     Old GCCs (4.6.3 at least), aren't able to follow the logic in
#     __kvmhv_copy_tofrom_guest_radix() and warn that old_pid is used
#     uninitialized:
#     
#       arch/powerpc/kvm/book3s_64_mmu_radix.c:75:3: error: 'old_pid' may be
#       used uninitialized in this function
#     
#     The logic is OK, we only use old_pid if quadrant == 1, and in that
#     case it has definitely be initialised, eg:
#     
#             if (quadrant == 1) {
#                     old_pid = mfspr(SPRN_PID);
#             ...
#             if (quadrant == 1 && pid != old_pid)
#                     mtspr(SPRN_PID, old_pid);
#     
#     Annotate it to fix the error.
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-gcc --version
# < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-ld --version
# < git log --format=%s --max-count=1 f460772291f8171988b2b60141a45706123d0c69
# < make -s -j 48 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  defconfig
# make -s -j 48 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  
<stdin>:1336:2: warning: #warning syscall rseq not implemented [-Wcpp]
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
  kernel: arch/sparc/boot/image is ready
  kernel: arch/sparc/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64
# Build took: 0:01:03.567021