Messages in this thread |  | | Date | Thu, 19 Mar 2015 08:38:05 -0700 | | From | Alexei Starovoitov <> | | Subject | Re: [PATCH v7 tip 3/8] tracing: allow BPF programs to call bpf_ktime_get_ns() |
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On 3/19/15 8:11 AM, Steven Rostedt wrote: > On Mon, 16 Mar 2015 14:49:39 -0700 > Alexei Starovoitov <ast@plumgrid.com> wrote: > >> bpf_ktime_get_ns() is used by programs to compue time delta between events > > "compute"
ok :)
>> + [BPF_FUNC_ktime_get_ns] = { >> + .func = bpf_ktime_get_ns, >> + .gpl_only = true, >> + .ret_type = RET_INTEGER, > > Hmm, a nanosecond value returned as integer? Is there a way to make > this a 64 bit return type, or is RET_INTEGER default to 64 bits in BPF > functions?
RET_INTEGER doesn't mean C 'int' width. It means non-pointer and non-void value. The return value is always promoted to full register width which is 64-bit.
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