From: Song Liu <songliubraving@fb.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Cc: "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
Networking <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Kernel Team <Kernel-team@fb.com>,
Peter Zijlstra <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
"jolsa@kernel.org" <jolsa@kernel.org>,
"namhyung@kernel.org" <namhyung@kernel.org>,
"sdf@fomichev.me" <sdf@fomichev.me>
Subject: Re: [PATCH v9 perf,bpf 04/15] perf, bpf: synthesize bpf events with bpf_program__get_prog_info_linear()
Date: Thu, 14 Mar 2019 05:08:56 +0000 [thread overview]
Message-ID: <A61CCE47-BB1E-48BD-B8F5-C8289E5F7B2E@fb.com> (raw)
In-Reply-To: <20190313210840.GB4786@kernel.org>
> On Mar 13, 2019, at 2:08 PM, Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com> wrote:
>
> 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
>
We can fix it with the following:
- u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(info->prog_tags);
- __u32 *prog_lens = (__u32 *)(info->jited_func_lens);
- __u64 *prog_addrs = (__u64 *)(info->jited_ksyms);
- void *func_infos = (void *)(info->func_info);
+ u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(intptr_t)(info->prog_tags);
+ __u32 *prog_lens = (__u32 *)(intptr_t)(info->jited_func_lens);
+ __u64 *prog_addrs = (__u64 *)(intptr_t)(info->jited_ksyms);
+ void *func_infos = (void *)(intptr_t)(info->func_info);
Thanks,
Song
next prev parent reply other threads:[~2019-03-14 5:09 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-12 5:30 [PATCH v9 perf,bpf 00/15] perf annotation of BPF programs Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 01/15] perf-record: replace option --bpf-event with --no-bpf-event Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 02/15] bpf: libbpf: introduce bpf_program__get_prog_info_linear() Song Liu
2019-03-12 13:50 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 03/15] bpf: bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump() Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 04/15] perf, bpf: synthesize bpf events with bpf_program__get_prog_info_linear() Song Liu
2019-03-13 21:00 ` Arnaldo Carvalho de Melo
2019-03-13 21:08 ` Arnaldo Carvalho de Melo
2019-03-14 5:08 ` Song Liu [this message]
2019-03-14 16:45 ` Song Liu
2019-03-14 18:30 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 05/15] perf: change prototype of perf_event__synthesize_bpf_events() Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 06/15] perf, bpf: save bpf_prog_info in a rbtree in perf_env Song Liu
2019-03-12 13:10 ` Jiri Olsa
2019-03-12 14:34 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data Song Liu
2019-03-12 13:10 ` Jiri Olsa
2019-03-12 14:47 ` Arnaldo Carvalho de Melo
2019-03-13 19:05 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 08/15] perf, bpf: save btf in a rbtree in perf_env Song Liu
2019-03-12 15:00 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data Song Liu
2019-03-12 15:14 ` Arnaldo Carvalho de Melo
2019-03-12 15:16 ` Arnaldo Carvalho de Melo
2019-03-12 16:26 ` Song Liu
2019-03-12 17:05 ` Arnaldo Carvalho de Melo
2019-03-12 17:29 ` Song Liu
2019-03-15 19:06 ` Arnaldo Carvalho de Melo
2019-03-15 19:26 ` Arnaldo Carvalho de Melo
2019-03-15 19:31 ` Song Liu
2019-03-15 19:42 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 10/15] perf-top: add option --no-bpf-event Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 12/15] perf, bpf: enable annotation of bpf program Song Liu
2019-03-18 16:38 ` Arnaldo Carvalho de Melo
2019-03-18 16:43 ` Arnaldo Carvalho de Melo
2019-03-19 6:10 ` Song Liu
2019-03-19 13:37 ` Arnaldo Carvalho de Melo
2019-03-19 6:05 ` Song Liu
2019-03-19 13:37 ` Arnaldo Carvalho de Melo
2019-03-19 13:58 ` Arnaldo Carvalho de Melo
2019-03-19 14:14 ` Arnaldo Carvalho de Melo
2019-03-19 14:52 ` [WORKS!] " Arnaldo Carvalho de Melo
2019-03-19 16:51 ` Song Liu
2019-03-19 16:55 ` Arnaldo Carvalho de Melo
2019-03-19 17:07 ` Arnaldo Carvalho de Melo
2019-03-12 5:30 ` [PATCH v9 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 14/15] perf: introduce side band thread Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 15/15] perf, bpf: save bpf_prog_info and btf of short living bpf programs Song Liu
2019-03-19 15:25 ` Arnaldo Carvalho de Melo
2019-03-12 13:12 ` [PATCH v9 perf,bpf 00/15] perf annotation of BPF programs Jiri Olsa
2019-03-21 9:10 ` Jiri Olsa
2019-03-21 14:12 ` Arnaldo Carvalho de Melo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=A61CCE47-BB1E-48BD-B8F5-C8289E5F7B2E@fb.com \
--to=songliubraving@fb.com \
--cc=Kernel-team@fb.com \
--cc=acme@redhat.com \
--cc=arnaldo.melo@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=jolsa@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=namhyung@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=sdf@fomichev.me \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).