# git rev-parse -q --verify c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0^{commit}
c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0
already have revision, skipping fetch
# git checkout -q -f -B kisskb c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0
# git clean -qxdf
# < git log -1
# commit c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Mon Jun 3 13:00:51 2019 +0000
# 
#     powerpc/32s: fix booting with CONFIG_PPC_EARLY_DEBUG_BOOTX
#     
#     When booting through OF, setup_disp_bat() does nothing because
#     disp_BAT are not set. By change, it used to work because BOOTX
#     buffer is mapped 1:1 at address 0x81000000 by the bootloader, and
#     btext_setup_display() sets virt addr same as phys addr.
#     
#     But since commit 215b823707ce ("powerpc/32s: set up an early static
#     hash table for KASAN."), a temporary page table overrides the
#     bootloader mapping.
#     
#     This 0x81000000 is also problematic with the newly implemented
#     Kernel Userspace Access Protection (KUAP) because it is within user
#     address space.
#     
#     This patch fixes those issues by properly setting disp_BAT through
#     a call to btext_prepare_BAT(), allowing setup_disp_bat() to
#     properly setup BAT3 for early bootx screen buffer access.
#     
#     Reported-by: Mathieu Malaterre <malat@debian.org>
#     Fixes: 215b823707ce ("powerpc/32s: set up an early static hash table for KASAN.")
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Tested-by: Mathieu Malaterre <malat@debian.org>
#     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 c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_PERF_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  powernv_defconfig
# Added to kconfig CONFIG_PERF_EVENTS=n
# yes \n | make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_PERF_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_PERF_ppc64le-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+0x3128): 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.

WARNING: vmlinux.o(.text+0x3164): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init 
annotation or the annotation of start_kernel is wrong.

arch/powerpc/kvm/book3s_hv_rmhandlers.o: In function `kvmppc_got_guest':
arch/powerpc/kvm/book3s_hv_rmhandlers.o:(.text+0x6b0): undefined reference to `dawr_force_enable'
arch/powerpc/kvm/book3s_hv_rmhandlers.o: In function `kvmppc_h_set_dabr':
(.text+0x18ac): undefined reference to `dawr_force_enable'
make[1]: *** [/kisskb/src/Makefile:1052: vmlinux] Error 1
make: *** [Makefile:179: sub-make] Error 2
Command 'make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_PERF_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-fixes_powernv_defconfig+NO_PERF_ppc64le-gcc5
# Build took: 0:01:29.257046