# git rev-parse -q --verify 892db32b07b340b60492e8e543aedc039639eef1^{commit}
892db32b07b340b60492e8e543aedc039639eef1
already have revision, skipping fetch
# git checkout -q -f -B kisskb 892db32b07b340b60492e8e543aedc039639eef1
# git clean -qxdf
# < git log -1
# commit 892db32b07b340b60492e8e543aedc039639eef1
# Author: David Hildenbrand <david@redhat.com>
# Date:   Mon Dec 16 11:30:58 2019 +0100
# 
#     powerpc/pseries/cmm: fix managed page counts when migrating pages between zones
#     
#     Commit 63341ab03706 (virtio-balloon: fix managed page counts when migrating
#     pages between zones) fixed a long existing BUG in the virtio-balloon
#     driver when pages would get migrated between zones.  I did not try to
#     reproduce on powerpc, but looking at the code, the same should apply to
#     powerpc/cmm ever since it started using the balloon compaction
#     infrastructure (luckily just recently).
#     
#     In case we have to migrate a ballon page to a newpage of another zone, the
#     managed page count of both zones is wrong. Paired with memory offlining
#     (which will adjust the managed page count), we can trigger kernel crashes
#     and all kinds of different symptoms.
#     
#     Fix it by properly adjusting the managed page count when migrating if
#     the zone changed.
#     
#     We'll temporarily modify the totalram page count. If this ever becomes a
#     problem, we can fine tune by providing helpers that don't touch
#     the totalram pages (e.g., adjust_zone_managed_page_count()).
#     
#     Fixes: fe030c9b85e6 ("powerpc/pseries/cmm: Implement balloon compaction")
#     Signed-off-by: David Hildenbrand <david@redhat.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191216103058.4958-1-david@redhat.com
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 892db32b07b340b60492e8e543aedc039639eef1
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/iss476-smp_defconfig

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/ext4/extents.c: In function 'ext4_convert_unwritten_io_end_vec':
/kisskb/src/fs/ext4/extents.c:5054:23: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c: In function 'blk_rq_map_sg':
/kisskb/src/block/blk.h:78:50: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:481:42: note: 'bvprv.bv_offset' was declared here
/kisskb/src/block/blk.h:81:12: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:481:42: note: 'bvprv.bv_len' was declared here
/kisskb/src/arch/powerpc/include/asm/io.h:802:22: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/block/blk-merge.c:481:42: note: 'bvprv.bv_page' was declared here
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
INFO: Uncompressed kernel (size 0x63d824) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
INFO: Uncompressed kernel (size 0x63d824) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_44x_iss476-smp_defconfig_powerpc-gcc4.6
# Build took: 0:00:55.646283