On Friday, 5 January 2018 18:04:10 GMT Ian Zimmerman wrote: > On 2018-01-05 11:10, Peter Humphrey wrote: > > Symbol: HAVE_EBPF_JIT [=y] > > │ > > │ Type : boolean > > │ Defined at net/Kconfig:436 > > │ Selected by: X86 [=y] && X86_64 [=y] > > > > So it's on, like it or not. This is kernel 4.9.72 on an i7-5820K. > > As Rich writes, the HAVE_* symbols are not settable via the UI, and in > fact do not toggle the inclusion of any code; they are automatically set > by kconfig to record the _availability_ of some features on the system, > based on given constraints such as architecture and memory model.
I didn't read that in what Rich wrote, but it's useful anyway - thanks. > So, HAVE_EBPF_JIT=y just means that BPF JIT _can_ be done on x86. There > is a separate BPF_JIT setting to actually enable it. Well, that doesn't seem to be present here. Just the HAVE_ symbol. -- Regards, Peter.
