# git rev-parse -q --verify e13e7cd4c0c1cc9984d9b6a8663e10d76b53f2aa^{commit}
e13e7cd4c0c1cc9984d9b6a8663e10d76b53f2aa
already have revision, skipping fetch
# git checkout -q -f -B kisskb e13e7cd4c0c1cc9984d9b6a8663e10d76b53f2aa
# git clean -qxdf
# < git log -1
# commit e13e7cd4c0c1cc9984d9b6a8663e10d76b53f2aa
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Sat Jun 22 08:55:54 2019 +1000
# 
#     powerpc/64s/exception: Fix machine check early corrupting AMR
#     
#     The early machine check runs in real mode, so locking is unnecessary.
#     Worse, the windup does not restore AMR, so this can result in a false
#     KUAP fault after a recoverable machine check hits inside a user copy
#     operation.
#     
#     Fix this similarly to HMI by just avoiding the kuap lock in the
#     early machine check handler (it will be set by the late handler that
#     runs in virtual mode if that runs). If the virtual mode handler is
#     reached, it will lock and restore the AMR.
#     
#     Fixes: 890274c2dc4c0 ("powerpc/64s: Implement KUAP for Radix MMU")
#     Cc: Russell Currey <ruscur@russell.cc>
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 e13e7cd4c0c1cc9984d9b6a8663e10d76b53f2aa
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return oldval == cmparg;
                 ^
/kisskb/src/kernel/futex.c:1633:6: note: 'oldval' was declared here
  int oldval, ret;
      ^
WARNING: vmlinux.o(.text+0x362a): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:.early_setup()
The function start_here_multiplatform() references
the function __init .early_setup().
This is often because start_here_multiplatform lacks a __init 
annotation or the annotation of .early_setup is wrong.

Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc5
# Build took: 0:02:37.433563