Messages in this thread | | | From | Alexei Starovoitov <> | Date | Tue, 20 Dec 2016 08:17:33 -0800 | Subject | Re: kernel/bpf/verifier.c: 4 * possible unintended fallthrough ? |
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On Tue, Dec 20, 2016 at 3:20 AM, David Binderman <dcb314@hotmail.com> wrote: > Hello there, > > I just tried to compile kernel-4.9 with a recent development > version of gcc. It said > > kernel/bpf/verifier.c:1907:23: warning: this statement may fall through [-Wimplicit-fallthrough=] > kernel/bpf/verifier.c:1918:23: warning: this statement may fall through [-Wimplicit-fallthrough=] > kernel/bpf/verifier.c:1859:24: warning: this statement may fall through [-Wimplicit-fallthrough=] > kernel/bpf/verifier.c:1869:24: warning: this statement may fall through [-Wimplicit-fallthrough=] > > Source code for the first one is > > case BPF_JGT: > /* Unsigned comparison, the minimum value is 0. */ > true_reg->min_value = 0; > case BPF_JSGT: > > Suggest either add the missing break or document the fallthrough > with a comment something like /* FALLTHROUGH */
I've tried 4.9 and 5.2 and don't see this warning. Is this 6.x gcc? I suspect it will have such warnings all over the kernel.
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