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Subject[Error after setting -Og] ‘ bad copy from’ declared with attribute error: copy source s ize is too small
Hi all,

I get a compile time error after setting -Og when compiling for the latest GitHub version.
I am using `make defconfig’ to get the default x86_64 config. But previously I did this in v4.4,
it's fine.

Modification to Makefile:
KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)

And error info:
In file included from ./arch/x86/include/asm/preempt.h:6:0,
from ./include/linux/preempt.h:80,
from ./include/linux/rcupdate.h:40,
from ./include/linux/rculist.h:10,
from ./include/linux/pid.h:4,
from ./include/linux/sched.h:13,
from kernel/ptrace.c:12:
In function ‘check_copy_size’,
inlined from ‘copy_to_user’ at ./include/linux/uaccess.h:153:6,
inlined from ‘ptrace_request’ at kernel/ptrace.c:934:7:
./include/linux/thread_info.h:138:4: error: call to ‘__bad_copy_from’ declared
with attribute error: copy source size is too small
scripts/ recipe for target 'kernel/ptrace.o' failed
make[1]: *** [kernel/ptrace.o] Error 1
Makefile:1023: recipe for target ‘kernel' failed

Any help is appreciated!

Thank you,
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