# git rev-parse -q --verify 2d83b0f30c1483a556c8aa1f7d891006fffcd5e0^{commit}
2d83b0f30c1483a556c8aa1f7d891006fffcd5e0
already have revision, skipping fetch
# git checkout -q -f -B kisskb 2d83b0f30c1483a556c8aa1f7d891006fffcd5e0
# git clean -qxdf
# < git log -1
# commit 2d83b0f30c1483a556c8aa1f7d891006fffcd5e0
# Author: Ard Biesheuvel <ardb@kernel.org>
# Date:   Wed Oct 28 09:04:33 2020 +0100
# 
#     powerpc: Avoid broken GCC __attribute__((optimize))
#     
#     Commit 7053f80d9696 ("powerpc/64: Prevent stack protection in early
#     boot") introduced a couple of uses of __attribute__((optimize)) with
#     function scope, to disable the stack protector in some early boot
#     code.
#     
#     Unfortunately, and this is documented in the GCC man pages [0],
#     overriding function attributes for optimization is broken, and is only
#     supported for debug scenarios, not for production: the problem appears
#     to be that setting GCC -f flags using this method will cause it to
#     forget about some or all other optimization settings that have been
#     applied.
#     
#     So the only safe way to disable the stack protector is to disable it
#     for the entire source file.
#     
#     [0] https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
#     
#     Fixes: 7053f80d9696 ("powerpc/64: Prevent stack protection in early boot")
#     Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
#     [mpe: Drop one remaining use of __nostackprotector, reported by snowpatch]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20201028080433.26799-1-ardb@kernel.org
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 2d83b0f30c1483a556c8aa1f7d891006fffcd5e0
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  randconfig
KCONFIG_SEED=0x8FA4718A
# 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
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:5120:warning: override: reassigning to symbol MODULE_SIG
.config:5121:warning: override: reassigning to symbol CPU_BIG_ENDIAN
.config:5121:warning: override: CPU_BIG_ENDIAN changes choice state
.config:5124:warning: override: reassigning to symbol SECTION_MISMATCH_WARN_ONLY
.config:5125:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
.config:5130:warning: override: reassigning to symbol UBSAN
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/fs/btrfs/tree-checker.c: In function 'check_root_item':
/kisskb/src/fs/btrfs/tree-checker.c:1056:9: warning: missing braces around initializer [-Wmissing-braces]
  struct btrfs_root_item ri = { 0 };
         ^
/kisskb/src/fs/btrfs/tree-checker.c:1056:9: warning: (near initialization for 'ri.inode') [-Wmissing-braces]
In file included from <command-line>:0:0:
/kisskb/src/drivers/media/platform/ti-vpe/cal.h: In function 'cal_read_field':
/kisskb/src/include/linux/compiler_types.h:319:38: error: call to '__compiletime_assert_221' declared with attribute error: FIELD_GET: mask is not constant
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^
/kisskb/src/include/linux/compiler_types.h:300:4: note: in definition of macro '__compiletime_assert'
    prefix ## suffix();    \
    ^
/kisskb/src/include/linux/compiler_types.h:319:2: note: in expansion of macro '_compiletime_assert'
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
  ^
/kisskb/src/include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^
/kisskb/src/include/linux/bitfield.h:46:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),  \
   ^
/kisskb/src/include/linux/bitfield.h:108:3: note: in expansion of macro '__BF_FIELD_CHECK'
   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
   ^
/kisskb/src/drivers/media/platform/ti-vpe/cal.h:220:9: note: in expansion of macro 'FIELD_GET'
  return FIELD_GET(mask, cal_read(cal, offset));
         ^
/kisskb/src/include/linux/compiler_types.h:319:38: error: call to '__compiletime_assert_222' declared with attribute error: FIELD_GET: mask is zero
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^
/kisskb/src/include/linux/compiler_types.h:300:4: note: in definition of macro '__compiletime_assert'
    prefix ## suffix();    \
    ^
/kisskb/src/include/linux/compiler_types.h:319:2: note: in expansion of macro '_compiletime_assert'
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
  ^
/kisskb/src/include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^
/kisskb/src/include/linux/bitfield.h:48:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero"); \
   ^
/kisskb/src/include/linux/bitfield.h:108:3: note: in expansion of macro '__BF_FIELD_CHECK'
   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
   ^
/kisskb/src/drivers/media/platform/ti-vpe/cal.h:220:9: note: in expansion of macro 'FIELD_GET'
  return FIELD_GET(mask, cal_read(cal, offset));
         ^
/kisskb/src/include/linux/compiler_types.h:319:38: error: call to '__compiletime_assert_225' declared with attribute error: BUILD_BUG_ON failed: (((mask) + (1ULL << (__builtin_ffsll(mask) - 1))) & (((mask) + (1ULL << (__builtin_ffsll(mask) - 1))) - 1)) != 0
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^
/kisskb/src/include/linux/compiler_types.h:300:4: note: in definition of macro '__compiletime_assert'
    prefix ## suffix();    \
    ^
/kisskb/src/include/linux/compiler_types.h:319:2: note: in expansion of macro '_compiletime_assert'
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
  ^
/kisskb/src/include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^
/kisskb/src/include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
  ^
/kisskb/src/include/linux/build_bug.h:21:2: note: in expansion of macro 'BUILD_BUG_ON'
  BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
  ^
/kisskb/src/include/linux/bitfield.h:54:3: note: in expansion of macro '__BUILD_BUG_ON_NOT_POWER_OF_2'
   __BUILD_BUG_ON_NOT_POWER_OF_2((_mask) +   \
   ^
/kisskb/src/include/linux/bitfield.h:108:3: note: in expansion of macro '__BF_FIELD_CHECK'
   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
   ^
/kisskb/src/drivers/media/platform/ti-vpe/cal.h:220:9: note: in expansion of macro 'FIELD_GET'
  return FIELD_GET(mask, cal_read(cal, offset));
         ^
make[5]: *** [/kisskb/src/scripts/Makefile.build:283: drivers/media/platform/ti-vpe/cal-camerarx.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [/kisskb/src/scripts/Makefile.build:500: drivers/media/platform/ti-vpe] Error 2
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [/kisskb/src/scripts/Makefile.build:500: drivers/media/platform] Error 2
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/kisskb/src/scripts/Makefile.build:500: drivers/media] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1799: drivers] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:185: __sub-make] Error 2
Command 'make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-next-rand_powerpc-randconfig_powerpc-gcc4.9
# Build took: 0:02:27.841891