# git rev-parse -q --verify df85055f4421b6d147cca0ac6df8535392128775^{commit}
df85055f4421b6d147cca0ac6df8535392128775
already have revision, skipping fetch
# git checkout -q -f -B kisskb df85055f4421b6d147cca0ac6df8535392128775
# git clean -qxdf
# < git log -1
# commit df85055f4421b6d147cca0ac6df8535392128775
# Author: Nathan Chancellor <nathan@kernel.org>
# Date:   Fri May 28 11:27:52 2021 -0700
# 
#     powerpc/barrier: Avoid collision with clang's __lwsync macro
#     
#     A change in clang 13 results in the __lwsync macro being defined as
#     __builtin_ppc_lwsync, which emits 'lwsync' or 'msync' depending on what
#     the target supports. This breaks the build because of -Werror in
#     arch/powerpc, along with thousands of warnings:
#     
#      In file included from arch/powerpc/kernel/pmc.c:12:
#      In file included from include/linux/bug.h:5:
#      In file included from arch/powerpc/include/asm/bug.h:109:
#      In file included from include/asm-generic/bug.h:20:
#      In file included from include/linux/kernel.h:12:
#      In file included from include/linux/bitops.h:32:
#      In file included from arch/powerpc/include/asm/bitops.h:62:
#      arch/powerpc/include/asm/barrier.h:49:9: error: '__lwsync' macro redefined [-Werror,-Wmacro-redefined]
#      #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
#             ^
#      <built-in>:308:9: note: previous definition is here
#      #define __lwsync __builtin_ppc_lwsync
#             ^
#      1 error generated.
#     
#     Undefine this macro so that the runtime patching introduced by
#     commit 2d1b2027626d ("powerpc: Fixup lwsync at runtime") continues to
#     work properly with clang and the build no longer breaks.
#     
#     Cc: stable@vger.kernel.org
#     Signed-off-by: Nathan Chancellor <nathan@kernel.org>
#     Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://github.com/ClangBuiltLinux/linux/issues/1386
#     Link: https://github.com/llvm/llvm-project/commit/62b5df7fe2b3fda1772befeda15598fbef96a614
#     Link: https://lore.kernel.org/r/20210528182752.1852002-1-nathan@kernel.org
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 df85055f4421b6d147cca0ac6df8535392128775
# < make -s -j 120 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  defconfig
# < make -s -j 120 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 120 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig
# make -s -j 120 ARCH=m68k O=/kisskb/build/powerpc-next_m68k-defconfig_m68k-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/m68k-linux/bin/m68k-linux-  
/kisskb/src/arch/m68k/mvme147/config.c: In function 'mvme147_hwclk':
/kisskb/src/arch/m68k/mvme147/config.c:174:2: warning: #warning check me! [-Wcpp]
 #warning check me!
  ^~~~~~~
/kisskb/src/arch/m68k/mvme16x/config.c: In function 'mvme16x_hwclk':
/kisskb/src/arch/m68k/mvme16x/config.c:439:2: warning: #warning check me! [-Wcpp]
 #warning check me!
  ^~~~~~~
/kisskb/src/drivers/i2c/busses/i2c-icy.c: In function 'icy_probe':
/kisskb/src/drivers/i2c/busses/i2c-icy.c:126:24: warning: unused variable 'new_fwnode' [-Wunused-variable]
  struct fwnode_handle *new_fwnode;
                        ^~~~~~~~~~
In file included from /kisskb/src/drivers/net/ethernet/8390/xsurf100.c:48:
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:995:27: warning: '____alloc_ei_netdev' defined but not used [-Wunused-function]
 static struct net_device *____alloc_ei_netdev(int size)
                           ^~~~~~~~~~~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:957:13: warning: '__ei_set_multicast_list' defined but not used [-Wunused-function]
 static void __ei_set_multicast_list(struct net_device *dev)
             ^~~~~~~~~~~~~~~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:857:33: warning: '__ei_get_stats' defined but not used [-Wunused-function]
 static struct net_device_stats *__ei_get_stats(struct net_device *dev)
                                 ^~~~~~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:512:13: warning: '__ei_poll' defined but not used [-Wunused-function]
 static void __ei_poll(struct net_device *dev)
             ^~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:303:20: warning: '__ei_start_xmit' defined but not used [-Wunused-function]
 static netdev_tx_t __ei_start_xmit(struct sk_buff *skb,
                    ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:257:13: warning: '__ei_tx_timeout' defined but not used [-Wunused-function]
 static void __ei_tx_timeout(struct net_device *dev, unsigned int txqueue)
             ^~~~~~~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:233:12: warning: '__ei_close' defined but not used [-Wunused-function]
 static int __ei_close(struct net_device *dev)
            ^~~~~~~~~~
/kisskb/src/drivers/net/ethernet/8390/lib8390.c:204:12: warning: '__ei_open' defined but not used [-Wunused-function]
 static int __ei_open(struct net_device *dev)
            ^~~~~~~~~
Completed OK
# rm -rf /kisskb/build/powerpc-next_m68k-defconfig_m68k-gcc8
# Build took: 0:01:12.668198