# 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/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 c21f5a9ed85ca3e914ca11f421677ae9ae0d04b0
# < make -s -j 120 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 120 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr':
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized]
   pd->msg->buf[real_pos] = data;
                          ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here
  unsigned char data;
                ^
/kisskb/src/net/ipv4/fib_semantics.c: In function 'fib_check_nh_v4_gw':
/kisskb/src/net/ipv4/fib_semantics.c:1027:12: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (!tbl || err) {
            ^
In file included from /kisskb/src/include/linux/rwsem.h:16:0,
                 from /kisskb/src/include/linux/notifier.h:15,
                 from /kisskb/src/include/linux/clk.h:17,
                 from /kisskb/src/drivers/tty/serial/sh-sci.c:24:
/kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/tty/serial/sh-sci.c:1353:16: note: 'flags' was declared here
  unsigned long flags;
                ^
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4
# Build took: 0:02:27.784474