Em Wed, Mar 13, 2019 at 06:00:30PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Mar 11, 2019 at 10:30:40PM -0700, Song Liu escreveu:
> > -
> > /* Synthesize PERF_RECORD_KSYMBOL */
> > for (i = 0; i < sub_prog_cnt; i++) {
> > + u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(info->prog_tags);
>
> Need this:
>
> - u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(info->prog_tags);
> + u8 (*prog_tags)[BPF_TAG_SIZE] = (u8 *)(info->prog_tags);
>
>
> To overcome this on debian:experimental-x-mips, i.e. Debian Experimental
> cross building to MIPS 32-bit:
>
> util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
> util/bpf-event.c:143:35: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(info->prog_tags);
> ^
> util/bpf-event.c:144:22: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> __u32 *prog_lens = (__u32 *)(info->jited_func_lens);
> ^
> util/bpf-event.c:145:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> __u64 *prog_addrs = (__u64 *)(info->jited_ksyms);
> ^
> util/bpf-event.c:146:22: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> void *func_infos = (void *)(info->func_info);
> ^
> CC /tmp/build/perf/util/pmu.o
> CC /tmp/build/perf/util/pmu-flex.o
> cc1: all warnings being treated as errors
Argh, hit the send button too fast, that is not the only case and then
my change just changed the error:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:143:35: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
u8 (*prog_tags)[BPF_TAG_SIZE] = (u8 *)(info->prog_tags);
^
util/bpf-event.c:143:35: error: initialization of 'u8 (*)[8]' {aka 'unsigned char (*)[8]'} from incompatible pointer type 'u8 *' {aka 'unsigned char *'} [-Werror=incompatible-pointer-types]
util/bpf-event.c:144:22: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
__u32 *prog_lens = (__u32 *)(info->jited_func_lens);
^
util/bpf-event.c:145:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
__u64 *prog_addrs = (__u64 *)(info->jited_ksyms);
^
util/bpf-event.c:146:22: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
void *func_infos = (void *)(info->func_info);
^
CC /tmp/build/perf/util/pmu.o
CC /tmp/build/perf/util/pmu-flex.o
cc1: all warnings being treated as errors
mv: cannot stat '/tmp/build/perf/util/.bpf-event.o.tmp': No such file or directory
