On Mon, Jan 28, 2019 at 10:05 PM <valdis.kletni...@vt.edu> wrote: > > Compiling with W=1 generates warnings: > > CC kernel/bpf/core.o > kernel/bpf/core.c:721:12: warning: no previous prototype for > ?bpf_jit_alloc_exec_limit? [-Wmissing-prototypes] > 721 | u64 __weak bpf_jit_alloc_exec_limit(void) > | ^~~~~~~~~~~~~~~~~~~~~~~~ > kernel/bpf/core.c:757:14: warning: no previous prototype for > ?bpf_jit_alloc_exec? [-Wmissing-prototypes] > 757 | void *__weak bpf_jit_alloc_exec(unsigned long size) > | ^~~~~~~~~~~~~~~~~~ > kernel/bpf/core.c:762:13: warning: no previous prototype for > ?bpf_jit_free_exec? [-Wmissing-prototypes] > 762 | void __weak bpf_jit_free_exec(void *addr) > | ^~~~~~~~~~~~~~~~~ > > All three are weak functions that archs can override, although none do so > currently. Provide prototypes for when a new arch provides its own. > > Signed-off-by: Valdis Kletnieks <valdis.kletni...@vt.edu>
Acked-by: Song Liu <songliubrav...@fb.com> > > diff --git a/include/linux/bpf.h b/include/linux/bpf.h > index 3851529062ec..99e55313123f 100644 > --- a/include/linux/bpf.h > +++ b/include/linux/bpf.h > @@ -472,6 +472,10 @@ _out: > \ > #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ > __BPF_PROG_RUN_ARRAY(array, ctx, func, true) > > +u64 __weak bpf_jit_alloc_exec_limit(void); > +void *__weak bpf_jit_alloc_exec(unsigned long size); > +void __weak bpf_jit_free_exec(void *addr); > + > #ifdef CONFIG_BPF_SYSCALL > DECLARE_PER_CPU(int, bpf_prog_active); > >
