On Sat, Dec 8, 2018 at 4:46 PM Mathieu Malaterre <ma...@debian.org> wrote: > > `pt_regs_check` is a dummy function, its purpose is to break the build > if struct pt_regs and struct user_pt_regs don't match. > > This function has no functionnal purpose, and will get eliminated at > link time or after init depending on CONFIG_LD_DEAD_CODE_DATA_ELIMINATION > > This commit adds a prototype to fix warning at W=1: > > arch/powerpc/kernel/ptrace.c:3339:13: error: no previous prototype for > ‘pt_regs_check’ [-Werror=missing-prototypes] > > Suggested-by: Christophe Leroy <christophe.le...@c-s.fr> > Signed-off-by: Mathieu Malaterre <ma...@debian.org> > --- > arch/powerpc/kernel/ptrace.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c > index a398999d0770..341c0060b4c8 100644 > --- a/arch/powerpc/kernel/ptrace.c > +++ b/arch/powerpc/kernel/ptrace.c > @@ -3338,6 +3338,10 @@ void do_syscall_trace_leave(struct pt_regs *regs) > user_enter(); > } > > +void __init pt_regs_check(void); > +/* dummy function, its purpose is to break the build if struct pt_regs and > + * struct user_pt_regs don't match. > + */
Another trick which seems to work with GCC is: -void __init pt_regs_check(void) +static inline void __init pt_regs_check(void) > void __init pt_regs_check(void) > { > BUILD_BUG_ON(offsetof(struct pt_regs, gpr) != > -- > 2.19.2 >