Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: 32-bit poweroc compile failure in v4.19-rc7-166-g7ec21823634d | Date | Mon, 15 Oct 2018 21:33:49 +1100 |
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Meelis Roos <mroos@linux.ee> writes: > 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:
That's GCC 8 I think?
I have seen that but couldn't work out what the hell GCC is thinking.
I don't think there's an actual bug, the size of the copy is bounded by the count parameter, which *doesn't* come from user space, it's hard coded.
I suspect the logic is just to convoluted for GCC.
We should fix it somehow, but I haven't worked out what's the best option.
cheers
> 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>
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