# git rev-parse -q --verify c72f04dc46f466a7574a204bf2e965aa1c5cf277^{commit}
c72f04dc46f466a7574a204bf2e965aa1c5cf277
already have revision, skipping fetch
# git checkout -q -f -B kisskb c72f04dc46f466a7574a204bf2e965aa1c5cf277
# git clean -qxdf
# < git log -1
# commit c72f04dc46f466a7574a204bf2e965aa1c5cf277
# Author: Petr Mladek <pmladek@suse.com>
# Date:   Wed May 27 14:28:44 2020 +0200
# 
#     powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again
#     
#     The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}()
#     only to archs where they work") caused that bpf_probe_read{, str}()
#     functions were not longer available on architectures where the same
#     logical address might have different content in kernel and user memory
#     mapping. These architectures should use probe_read_{user,kernel}_str
#     helpers.
#     
#     For backward compatibility, the problematic functions are still
#     available on architectures where the user and kernel address spaces
#     are not overlapping. This is defined
#     CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE.
#     
#     At the moment, these backward compatible functions are enabled only on
#     x86_64, arm, and arm64. Let's do it also on powerpc that has the non
#     overlapping address space as well.
#     
#     Fixes: 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work")
#     Signed-off-by: Petr Mladek <pmladek@suse.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200527122844.19524-1-pmladek@suse.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 c72f04dc46f466a7574a204bf2e965aa1c5cf277
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  corenet64_smp_defconfig
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return oldval == cmparg;
                 ^
/kisskb/src/kernel/futex.c:1652:6: note: 'oldval' was declared here
  int oldval, ret;
      ^
INFO: Uncompressed kernel (size 0x110b138) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x1200000)
Image Name:   Linux-5.7.0-rc2-gc72f04dc46f4
Created:      Fri May 29 02:36:43 2020
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    7180863 Bytes = 7012.56 KiB = 6.85 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_corenet64_smp_defconfig_powerpc-gcc4.9
# Build took: 0:02:30.468898