# git rev-parse -q --verify 932bba9c9c94d08fe4c8075bf55cafa0a5c16e2b^{commit}
932bba9c9c94d08fe4c8075bf55cafa0a5c16e2b
already have revision, skipping fetch
# git checkout -q -f -B kisskb 932bba9c9c94d08fe4c8075bf55cafa0a5c16e2b
# git clean -qxdf
# < git log -1
# commit 932bba9c9c94d08fe4c8075bf55cafa0a5c16e2b
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Wed Jan 22 17:52:50 2020 +0000
# 
#     powerpc/32s: Drop NULL addr verification
#     
#     NULL addr is a user address. Don't waste time checking it. If
#     someone tries to access it, it will SIGFAULT the same way as for
#     address 1, so no need to make it special.
#     
#     The special case is when not doing a write, in that case we want
#     to drop the entire function. This is now handled by 'dir' param
#     and not by the nulity of 'to' anymore.
#     
#     Also make beginning of prevent_user_access() similar
#     to beginning of allow_user_access(), and tell the compiler
#     that writing in kernel space or with a 0 length is unlikely
#     
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/d79cb9f680f4e971e05262303103a4b94baa91ce.1579715466.git.christophe.leroy@c-s.fr
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 932bba9c9c94d08fe4c8075bf55cafa0a5c16e2b
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  randconfig
KCONFIG_SEED=0xD18DC5AC
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_CPU_BIG_ENDIAN=y
# Added to kconfig CONFIG_PPC64=y
# Added to kconfig CONFIG_PPC_DISABLE_WERROR=y
# Added to kconfig CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_LD_HEAD_STUB_CATCH=y
# Added to kconfig CONFIG_TRIM_UNUSED_KSYMS=n
# Added to kconfig CONFIG_UBSAN=n
# yes \n | make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/arch/powerpc/xmon/xmon.c:64:
/kisskb/src/arch/powerpc/xmon/dis-asm.h: In function 'print_insn_powerpc':
/kisskb/src/arch/powerpc/xmon/dis-asm.h:16:13: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'long unsigned int' [-Wformat=]
  printf("%.8x", insn);
          ~~~^   ~~~~
          %.8lx
/kisskb/src/arch/powerpc/xmon/dis-asm.h: In function 'print_insn_spu':
/kisskb/src/arch/powerpc/xmon/dis-asm.h:22:13: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'long unsigned int' [-Wformat=]
  printf("%.8x", insn);
          ~~~^   ~~~~
          %.8lx
/kisskb/src/kernel/trace/trace_events_inject.c: In function 'event_inject_write':
/kisskb/src/kernel/trace/trace_events_inject.c:215:10: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
    char *addr = (char *)(unsigned long) val;
          ^~~~
/kisskb/src/kernel/trace/trace_events_inject.c:198:6: note: 'val' was declared here
  u64 val;
      ^~~
/kisskb/src/kernel/watchdog.c:47:23: warning: 'watchdog_allowed_mask' defined but not used [-Wunused-variable]
 static struct cpumask watchdog_allowed_mask __read_mostly;
                       ^~~~~~~~~~~~~~~~~~~~~
Failed to generate BTF for vmlinux
Try to disable CONFIG_DEBUG_INFO_BTF
make[1]: *** [/kisskb/src/Makefile:1078: vmlinux] Error 1
make: *** [Makefile:179: sub-make] Error 2
Command 'make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc8
# Build took: 0:04:49.841233