when you change the prototype to 'const void *' does it help compiler to unroll it?
On Tue, Dec 13, 2016 at 12:06 PM, Mauricio Vasquez via iovisor-dev <[email protected]> wrote: > Hello, > > We are having some doubts about the use of the const qualifier for the key > argument in functions to access eBPF maps, both, from user space and within > eBPF programs. > > According to our understanding the key is not modified when used to access > the maps, however we noticed that in the bpf_*_elem functions [1] and in > the array_map_*_elem functions [2] the const qualifier is not used. Is there > any particular reason for avoid using it? > > An additional question: how is the prototype of the map.lookup function > provided by bcc generated? > > We are asking it because we think that the lack of the const qualifier is > causing some problems in the loop unrolling procedure [3]. > > Thank you very much, > > Mauricio > > [1] > https://github.com/torvalds/linux/blob/master/samples/bpf/libbpf.h#L9-L11 > > [2] https://github.com/torvalds/linux/blob/master/kernel/bpf/arraymap.c#L110 > > [3] > https://lists.iovisor.org/pipermail/iovisor-dev/2016-December/000539.html > > > > > _______________________________________________ > iovisor-dev mailing list > [email protected] > https://lists.iovisor.org/mailman/listinfo/iovisor-dev > _______________________________________________ iovisor-dev mailing list [email protected] https://lists.iovisor.org/mailman/listinfo/iovisor-dev
