On 4/5/2022 12:12 AM, guoren@kernel.org wrote:

From: Christoph Hellwig <hch@lst.de>

Don't bother to define the symbols empty, just don't use them.
That makes the intent a little more clear.

Remove the unused HAVE_ARCH_STRUCT_FLOCK64 define and merge the
32-bit mips struct flock into the generic one.

Add a new __ARCH_FLOCK_EXTRA_SYSID macro following the style of
__ARCH_FLOCK_PAD to avoid having a separate definition just for
one architecture.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>

Being late to this, but this breaks the perf build for me using a MIPS 
toolchain with the following:

   CC 
/home/fainelli/work/buildroot/output/bmips/build/linux-custom/tools/perf/trace/beauty/fcntl.o
In file included from 
../../../../host/mipsel-buildroot-linux-gnu/sysroot/usr/include/asm/fcntl.h:77,
                  from ../include/uapi/linux/fcntl.h:5,
                  from trace/beauty/fcntl.c:10:
../include/uapi/asm-generic/fcntl.h:188:8: error: redefinition of 
'struct flock'
  struct flock {
         ^~~~~
In file included from ../include/uapi/linux/fcntl.h:5,
                  from trace/beauty/fcntl.c:10:
../../../../host/mipsel-buildroot-linux-gnu/sysroot/usr/include/asm/fcntl.h:63:8: 
note: originally defined here
  struct flock {
         ^~~~~
make[6]: *** 
[/home/fainelli/work/buildroot/output/bmips/build/linux-custom/tools/build/Makefile.build:97: 
/home/fainelli/work/buildroot/output/bmips/build/linux-custom/tools/perf/trace/beauty/fcntl.o] 
Error 1

the kernel headers are set to 4.1.31 which is arguably old but 
toolchains using newer kernel headers do not fare much better either 
unfortunately as I tried a toolchain with kernel headers 4.9.x.

I will start doing more regular MIPS builds of the perf tools since that 
seems to escape our testing.

Thanks!
-- 
Florian