# git rev-parse -q --verify cafa0010cd51fb711fdcb50fc55f394c5f167a0a^{commit}
cafa0010cd51fb711fdcb50fc55f394c5f167a0a
already have revision, skipping fetch
# git checkout -q -f -B kisskb cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# git clean -qxdf
# < git log -1
# commit cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# Author: Joe Perches <joe@perches.com>
# Date:   Mon Aug 20 13:15:26 2018 -0700
# 
#     Raise the minimum required gcc version to 4.6
#     
#     Various architectures fail to build properly with older versions of the
#     gcc compiler.
#     
#     An example from Guenter Roeck in thread [1]:
#     >
#     >   In file included from ./include/linux/mm.h:17:0,
#     >                    from ./include/linux/pid_namespace.h:7,
#     >                    from ./include/linux/ptrace.h:10,
#     >                    from arch/openrisc/kernel/asm-offsets.c:32:
#     >   ./include/linux/mm_types.h:497:16: error: flexible array member in otherwise empty struct
#     >
#     > This is just an example with gcc 4.5.1 for or32. I have seen the problem
#     > with gcc 4.4 (for unicore32) as well.
#     
#     So update the minimum required version of gcc to 4.6.
#     
#     [1] https://lore.kernel.org/lkml/20180814170904.GA12768@roeck-us.net/
#     
#     Miscellanea:
#     
#      - Update Documentation/process/changes.rst
#     
#      - Remove and consolidate version test blocks in compiler-gcc.h for
#        versions lower than 4.6
#     
#     Signed-off-by: Joe Perches <joe@perches.com>
#     Reviewed-by: Kees Cook <keescook@chromium.org>
#     Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-gcc --version
# < git log --format=%s --max-count=1 cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  allmodconfig
# Added to kconfig CONFIG_CPU_LITTLE_ENDIAN=y
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# yes \n | make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_allmodconfig+ppc64le_ppc64le CROSS_COMPILE=/opt/cross/kisskb/gcc-5.2.0-nolibc/powerpc64le-linux/bin/powerpc64le-linux-  
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
/kisskb/src/arch/powerpc/include/asm/io.h:160:2: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]
  __asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0"   \
  ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:14: note: 'px_is' was declared here
  u32 px_cmd, px_is, px_val;
              ^
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/arch/powerpc/include/asm/io.h:160:2: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
  __asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0"   \
  ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:6: note: 'px_cmd' was declared here
  u32 px_cmd, px_is, px_val;
      ^
/kisskb/src/drivers/bluetooth/hci_h5.c:920:22: warning: 'rtl_vnd' defined but not used [-Wunused-variable]
 static struct h5_vnd rtl_vnd = {
                      ^
WARNING: vmlinux.o(.text+0x36b4): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init()
The function __boot_from_prom() references
the function __init prom_init().
This is often because __boot_from_prom lacks a __init 
annotation or the annotation of prom_init is wrong.

WARNING: vmlinux.o(.text+0x3944): 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+0x3978): 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.

Completed OK
# rm -rf /kisskb/build/linus_allmodconfig+ppc64le_ppc64le
# Build took: 0:26:23.925491