# git rev-parse -q --verify 0460534b532e5518c657c7d6492b9337d975eaa3^{commit}
0460534b532e5518c657c7d6492b9337d975eaa3
already have revision, skipping fetch
# git checkout -q -f -B kisskb 0460534b532e5518c657c7d6492b9337d975eaa3
# git clean -qxdf
# < git log -1
# commit 0460534b532e5518c657c7d6492b9337d975eaa3
# Author: Vaibhav Jain <vaibhav@linux.ibm.com>
# Date:   Mon Sep 7 16:35:40 2020 +0530
# 
#     powerpc/papr_scm: Limit the readability of 'perf_stats' sysfs attribute
#     
#     The newly introduced 'perf_stats' attribute uses the default access
#     mode of 0444, allowing non-root users to access performance stats of
#     an nvdimm and potentially force the kernel into issuing a large number
#     of expensive hypercalls. Since the information exposed by this
#     attribute cannot be cached it is better to ward off access to this
#     attribute from users who don't need to access to these performance
#     statistics.
#     
#     Hence update the access mode of 'perf_stats' attribute to be only
#     readable by root users.
#     
#     Fixes: 2d02bf835e57 ("powerpc/papr_scm: Fetch nvdimm performance stats from PHYP")
#     Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
#     Reviewed-by: Ira Weiny <ira.weiny@intel.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200907110540.21349-1-vaibhav@linux.ibm.com
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 0460534b532e5518c657c7d6492b9337d975eaa3
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_bamboo_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  44x/bamboo_defconfig
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_bamboo_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_bamboo_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_bamboo_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/block/genhd.c: In function 'diskstats_show':
/kisskb/src/block/genhd.c:1667:1: warning: the frame size of 1160 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
INFO: Uncompressed kernel (size 0x4ccd90) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
INFO: Uncompressed kernel (size 0x4ccd90) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-5.9.0-rc1-g0460534b532e
Created:      Fri Sep 11 00:57:35 2020
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2473857 Bytes = 2415.88 KiB = 2.36 MiB
Load Address: 00500000
Entry Point:  005001b8
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_44x_bamboo_defconfig_powerpc-gcc4.9
# Build took: 0:00:46.573457