# git rev-parse -q --verify 612ee81b9461475b5a5612c2e8d71559dd3c7920^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test
# git rev-parse -q --verify 612ee81b9461475b5a5612c2e8d71559dd3c7920^{commit}
612ee81b9461475b5a5612c2e8d71559dd3c7920
# git checkout -q -f -B kisskb 612ee81b9461475b5a5612c2e8d71559dd3c7920
# git clean -qxdf
# < git log -1
# commit 612ee81b9461475b5a5612c2e8d71559dd3c7920
# Author: Vaibhav Jain <vaibhav@linux.ibm.com>
# Date:   Fri Sep 27 11:50:02 2019 +0530
# 
#     powerpc/papr_scm: Fix an off-by-one check in papr_scm_meta_{get, set}
#     
#     A validation check to prevent out of bounds read/write inside
#     functions papr_scm_meta_{get,set}() is off-by-one that prevent reads
#     and writes to the last byte of the label area.
#     
#     This bug manifests as a failure to probe a dimm when libnvdimm is
#     unable to read the entire config-area as advertised by
#     ND_CMD_GET_CONFIG_SIZE. This usually happens when there are large
#     number of namespaces created in the region backed by the dimm and the
#     label-index spans max possible config-area. An error of the form below
#     usually reported in the kernel logs:
#     
#     [  255.293912] nvdimm: probe of nmem0 failed with error -22
#     
#     The patch fixes these validation checks there by letting libnvdimm
#     access the entire config-area.
#     
#     Fixes: 53e80bd042773('powerpc/nvdimm: Add support for multibyte read/write for metadata')
#     Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
#     Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20190927062002.3169-1-vaibhav@linux.ibm.com
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 612ee81b9461475b5a5612c2e8d71559dd3c7920
# < make -s -j 80 ARCH=x86_64 O=/kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-  allnoconfig
# make -s -j 80 ARCH=x86_64 O=/kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-  
/kisskb/src/tools/objtool
/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/arch/x86/kernel/apic/io_apic.c: In function 'mp_map_pin_to_irq':
/kisskb/src/arch/x86/kernel/apic/io_apic.c:1037:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/x86/kernel/e820.c: In function 'e820__setup_pci_gap':
/kisskb/src/arch/x86/kernel/e820.c:664:16: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/powerpc-next_x86_64-allnoconfig_x86_64-gcc4.6
# Build took: 0:01:15.763377