On Sat, Feb 28, 2015 at 2:20 AM, Peter Zijlstra <[email protected]> wrote: >> >> +static u64 bpf_ktime_get_ns(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) >> +{ >> + return ktime_get_ns(); >> +} > > Please use ktime_get_mono_fast_ns() instead. If you ever want to allow > running BPF stuff from general tracepoints and the like you need to > be NMI safe.
good point. will do. Currently in trace_call_bpf() I have: if (in_nmi()) /* not supported yet */ return 1; to tackle nmi after all pieces are in place. Likely nmi-safe programs will have access to reduced set of helper functions. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
