# git rev-parse -q --verify c716a25b9b70084e1144f77423f5aedd772ea478^{commit}
c716a25b9b70084e1144f77423f5aedd772ea478
already have revision, skipping fetch
# git checkout -q -f -B kisskb c716a25b9b70084e1144f77423f5aedd772ea478
# git clean -qxdf
# < git log -1
# commit c716a25b9b70084e1144f77423f5aedd772ea478
# Author: Thiago Jung Bauermann <bauerman@linux.ibm.com>
# Date:   Thu Sep 20 01:38:58 2018 -0300
# 
#     powerpc/pkeys: Fix reading of ibm, processor-storage-keys property
#     
#     scan_pkey_feature() uses of_property_read_u32_array() to read the
#     ibm,processor-storage-keys property and calls be32_to_cpu() on the
#     value it gets. The problem is that of_property_read_u32_array() already
#     returns the value converted to the CPU byte order.
#     
#     The value of pkeys_total ends up more or less sane because there's a min()
#     call in pkey_initialize() which reduces pkeys_total to 32. So in practice
#     the kernel ignores the fact that the hypervisor reserved one key for
#     itself (the device tree advertises 31 keys in my test VM).
#     
#     This is wrong, but the effect in practice is that when a process tries to
#     allocate the 32nd key, it gets an -EINVAL error instead of -ENOSPC which
#     would indicate that there aren't any keys available
#     
#     Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
#     Cc: stable@vger.kernel.org # v4.16+
#     Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-gcc --version
# < git log --format=%s --max-count=1 c716a25b9b70084e1144f77423f5aedd772ea478
# < make -s -j 48 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  defconfig
# make -s -j 48 ARCH=sparc64 O=/kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-  
<stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
<stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp]
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
  kernel: arch/sparc/boot/image is ready
  kernel: arch/sparc/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_sparc64-defconfig_sparc64
# Build took: 0:01:10.847459