-Wimplicit-function-declaration of current_thread_info

[nickdesaulniers]

via last night's linux-next: https://travis-ci.com/github/ClangBuiltLinux/continuous-integration/jobs/346493536

In file included from arch/riscv/kernel/asm-offsets.c:10:
In file included from ./include/linux/sched.h:14:
In file included from ./include/linux/pid.h:6:
In file included from ./include/linux/wait.h:9:
In file included from ./include/linux/spinlock.h:60:
In file included from ./arch/riscv/include/asm/mmiowb.h:13:
./include/asm-generic/mmiowb.h:37:28: error: implicit declaration of function 'current_thread_info' [-Werror,-Wimplicit-function-declaration]
        struct mmiowb_state *ms = __mmiowb_state();
                                  ^
./include/asm-generic/mmiowb.h:30:26: note: expanded from macro '__mmiowb_state'
#define __mmiowb_state()        this_cpu_ptr(&__mmiowb_state)
                                ^
./include/linux/percpu-defs.h:252:27: note: expanded from macro 'this_cpu_ptr'
#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
                          ^
./include/linux/percpu-defs.h:242:2: note: expanded from macro 'raw_cpu_ptr'
        arch_raw_cpu_ptr(ptr);                                          \
        ^
./include/asm-generic/percpu.h:44:53: note: expanded from macro 'arch_raw_cpu_ptr'
#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
                                                    ^
./include/asm-generic/percpu.h:31:40: note: expanded from macro '__my_cpu_offset'
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
                                       ^
./arch/riscv/include/asm/smp.h:47:33: note: expanded from macro 'raw_smp_processor_id'
#define raw_smp_processor_id() (current_thread_info()->cpu)
                                ^

[nickdesaulniers]

@palmer-dabbelt mentions this may already be fixed.

[palmer-dabbelt]

This was the one I actually saw first in my make, so it's definitely fixed. The other two smell like they'd come from the same issue. It took a bit to track down because we had a breakage in Linus', as of 084623e ("Merge tag 'modules-for-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux") it should build (my for-next is now on top of that).

[nathanchance]

Long been fixed.