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 16:45:22 +0000 [thread overview]
Message-ID: <741F3DF8-F95F-4521-BD46-B31A675D8E76@fb.com> (raw)
In-Reply-To: <A61CCE47-BB1E-48BD-B8F5-C8289E5F7B2E@fb.com>
> On Mar 13, 2019, at 10:08 PM, Song Liu <songliubraving@fb.com> wrote:
>
>
>
>> 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
Actually, I think uintptr_t is better than intptr_t here.
Thanks,
Song
next prev parent reply other threads:[~2019-03-14 16:45 UTC|newest]
Thread overview: 100+ 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
2019-03-22 22:35 ` [tip:perf/urgent] perf record: Replace " tip-bot for 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
2019-03-22 22:36 ` [tip:perf/urgent] tools lib bpf: Introduce bpf_program__get_prog_info_linear() tip-bot for Song Liu
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
2019-03-22 22:36 ` [tip:perf/urgent] " tip-bot for 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
2019-03-14 16:45 ` Song Liu [this message]
2019-03-14 18:30 ` Arnaldo Carvalho de Melo
2019-03-22 22:37 ` [tip:perf/urgent] perf bpf: Synthesize " tip-bot for Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 05/15] perf: change prototype of perf_event__synthesize_bpf_events() Song Liu
2019-03-22 22:37 ` [tip:perf/urgent] perf bpf: Make synthesize_bpf_events() receive perf_session pointer instead of perf_tool tip-bot for 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
2019-03-22 22:38 ` [tip:perf/urgent] perf bpf: Save " tip-bot for Song Liu
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
2019-03-22 22:39 ` [tip:perf/urgent] perf bpf: Save " tip-bot for Song Liu
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
2019-03-22 22:39 ` [tip:perf/urgent] perf bpf: Save BTF " tip-bot for Song Liu
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
2019-03-22 22:40 ` [tip:perf/urgent] perf bpf: Save BTF " tip-bot for Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 10/15] perf-top: add option --no-bpf-event Song Liu
2019-03-22 22:41 ` [tip:perf/urgent] perf top: Add " tip-bot for Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd Song Liu
2019-03-22 22:41 ` [tip:perf/urgent] perf feature detection: Add " tip-bot for 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
2019-03-22 22:42 ` [tip:perf/urgent] perf symbols: Introduce DSO_BINARY_TYPE__BPF_PROG_INFO tip-bot for Song Liu
2019-03-22 22:43 ` [tip:perf/urgent] perf build: Check what binutils's 'disassembler()' signature to use tip-bot for Song Liu
2019-03-22 22:44 ` [tip:perf/urgent] perf annotate: Enable annotation of BPF programs tip-bot for Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation Song Liu
2019-03-22 22:43 ` [tip:perf/urgent] perf bpf: Process " tip-bot for Song Liu
2019-03-12 5:30 ` [PATCH v9 perf,bpf 14/15] perf: introduce side band thread Song Liu
2019-03-22 22:45 ` [tip:perf/urgent] perf evlist: Introduce " tip-bot for 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
2019-03-22 22:45 ` [tip:perf/urgent] perf tools: Save bpf_prog_info and BTF of new BPF programs tip-bot for Song Liu
2019-03-12 13:12 ` [PATCH v9 perf,bpf 00/15] perf annotation of " Jiri Olsa
2019-03-21 9:10 ` Jiri Olsa
2019-03-21 14:12 ` Arnaldo Carvalho de Melo
-- strict thread matches above, loose matches on Subject: below --
2019-03-07 17:57 [PATCH v7 " Song Liu
2019-03-07 17:57 ` [PATCH v7 perf,bpf 01/15] perf, bpf: consider events with attr.bpf_event as side-band events Song Liu
2019-03-07 17:57 ` [PATCH v7 perf,bpf 02/15] bpf: libbpf: introduce bpf_program__get_prog_info_linear() Song Liu
2019-03-11 18:26 ` Arnaldo Carvalho de Melo
2019-03-11 20:45 ` Daniel Borkmann
2019-03-11 20:57 ` Arnaldo Carvalho de Melo
2019-03-12 11:20 ` Daniel Borkmann
2019-03-07 17:57 ` [PATCH v7 perf,bpf 03/15] bpf: bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump() Song Liu
2019-03-07 17:57 ` [PATCH v7 perf,bpf 04/15] perf, bpf: synthesize bpf events with bpf_program__get_prog_info_linear() Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 05/15] perf: change prototype of perf_event__synthesize_bpf_events() Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 06/15] perf, bpf: save bpf_prog_info in a rbtree in perf_env Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data Song Liu
2019-03-11 17:56 ` Jiri Olsa
2019-03-11 18:05 ` Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 08/15] perf, bpf: save btf in a rbtree in perf_env Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data Song Liu
2019-03-11 17:56 ` Jiri Olsa
2019-03-07 17:58 ` [PATCH v7 perf,bpf 10/15] perf-top: add option --no-bpf-event Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd Song Liu
2019-03-07 23:26 ` Stanislav Fomichev
2019-03-07 23:47 ` Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 12/15] perf, bpf: enable annotation of bpf program Song Liu
2019-03-11 17:56 ` Jiri Olsa
2019-03-11 18:04 ` Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation Song Liu
2019-03-07 17:58 ` [PATCH v7 perf,bpf 14/15] perf: introduce side band thread Song Liu
2019-03-11 17:57 ` Jiri Olsa
2019-03-07 17:58 ` [PATCH v7 perf,bpf 15/15] perf, bpf: save bpf_prog_info and btf of short living bpf programs Song Liu
2019-03-11 13:59 ` [PATCH v7 perf,bpf 00/15] perf annotation of BPF programs Jiri Olsa
2019-03-11 14:16 ` Song Liu
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