# git rev-parse -q --verify 8f0c636b05429d3a83993074c35fce62eb9856ef^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test
# git rev-parse -q --verify 8f0c636b05429d3a83993074c35fce62eb9856ef^{commit}
8f0c636b05429d3a83993074c35fce62eb9856ef
# git checkout -q -f -B kisskb 8f0c636b05429d3a83993074c35fce62eb9856ef
# git clean -qxdf
# < git log -1
# commit 8f0c636b05429d3a83993074c35fce62eb9856ef
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Thu Sep 20 14:03:58 2018 +0530
# 
#     powerpc/mm: Increase the max addressable memory to 2PB
#     
#     Currently we limit the max addressable memory to 128TB. This patch increase the
#     limit to 2PB. We can have devices like nvdimm which adds memory above 512TB
#     limit.
#     
#     We still don't support regular system ram above 512TB. One of the challenge with
#     that is the percpu allocator, that allocates per node memory and use the max
#     distance between them as the percpu offsets. This means with large gap in
#     address space ( system ram above 1PB) we will run out of vmalloc space to map
#     the percpu allocation.
#     
#     In order to support addressable memory above 512TB, kernel should be able to
#     linear map this range. To do that with hash translation we now add 4 context
#     to kernel linear map region. Our per context addressable range is 512TB. We
#     still keep VMALLOC and VMEMMAP region to old size. SLB miss handlers is updated
#     to validate these limit.
#     
#     We also limit this update to SPARSEMEM_VMEMMAP and SPARSEMEM_EXTREME
#     
#     Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-gcc --version
# < git log --format=%s --max-count=1 8f0c636b05429d3a83993074c35fce62eb9856ef
# < make -s -j 80 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  defconfig
# make -s -j 80 ARCH=s390 O=/kisskb/build/powerpc-next_s390-defconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:185:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1256:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/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:341:21: note: 'pdeo' was declared here
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1836:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1746:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/powerpc-next_s390-defconfig_s390x
# Build took: 0:03:06.581615