32-bit poweroc compile failure in v4.19-rc7-166-g7ec21823634d

[Meelis Roos <mroos@linux.ee>]

I tried to test the fix to 32-bit poweroc boot hang but found that current git does not compile on 32bit poweroc at all for me:

   CC      arch/powerpc/kernel/ptrace.o
In file included from ./include/linux/bitmap.h:9,
                  from ./include/linux/cpumask.h:12,
                  from ./include/linux/rcupdate.h:44,
                  from ./include/linux/rculist.h:11,
                  from ./include/linux/pid.h:5,
                  from ./include/linux/sched.h:14,
                  from arch/powerpc/kernel/ptrace.c:19:
In function ‘memcpy’,
     inlined from ‘user_regset_copyin’ at ./include/linux/regset.h:295:4,
     inlined from ‘vr_set’ at arch/powerpc/kernel/ptrace.c:619:9:
./include/linux/string.h:345:9: error: ‘__builtin_memcpy’ offset [-527, -529] is out of the bounds [0, 16] of object ‘vrsave’ with type ‘union <anonymous>’ [-Werror=array-bounds]
   return __builtin_memcpy(p, q, size);
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/ptrace.c: In function ‘vr_set’:
arch/powerpc/kernel/ptrace.c:614:5: note: ‘vrsave’ declared here
    } vrsave;
      ^~~~~~
In file included from ./include/linux/bitmap.h:9,
                  from ./include/linux/cpumask.h:12,
                  from ./include/linux/rcupdate.h:44,
                  from ./include/linux/rculist.h:11,
                  from ./include/linux/pid.h:5,
                  from ./include/linux/sched.h:14,
                  from arch/powerpc/kernel/ptrace.c:19:
In function ‘memcpy’,
     inlined from ‘user_regset_copyout’ at ./include/linux/regset.h:270:4,
     inlined from ‘vr_get’ at arch/powerpc/kernel/ptrace.c:572:9:
./include/linux/string.h:345:9: error: ‘__builtin_memcpy’ offset [-527, -529] is out of the bounds [0, 16] of object ‘vrsave’ with type ‘union <anonymous>’ [-Werror=array-bounds]
   return __builtin_memcpy(p, q, size);
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/ptrace.c: In function ‘vr_get’:
arch/powerpc/kernel/ptrace.c:567:5: note: ‘vrsave’ declared here
    } vrsave;
      ^~~~~~
cc1: all warnings being treated as errors
make[1]: *** [scripts/Makefile.build:306: arch/powerpc/kernel/ptrace.o] Error 1
make: *** [Makefile:1052: arch/powerpc/kernel] Error 2

-- 
Meelis Roos <mroos@linux.ee>