Re: net/bpf/test_run.c:511:1: warning: 'retain' attribute ignored
From: Philip Li
Date: Wed Mar 19 2025 - 11:03:41 EST
On Wed, Mar 19, 2025 at 03:37:16PM +0100, Jiri Olsa wrote:
> On Wed, Mar 19, 2025 at 07:30:45PM +0800, kernel test robot wrote:
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 81e4f8d68c66da301bb881862735bd74c6241a19
> > commit: 7bdcedd5c8fb88e7176b93812b139eca5fe0aa46 bpf: Harden __bpf_kfunc tag against linker kfunc removal
> > date: 9 months ago
> > config: mips-allmodconfig (https://download.01.org/0day-ci/archive/20250319/202503191909.SHOCLBzK-lkp@xxxxxxxxx/config)
> > compiler: mips-linux-gcc (GCC) 11.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250319/202503191909.SHOCLBzK-lkp@xxxxxxxxx/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202503191909.SHOCLBzK-lkp@xxxxxxxxx/
> >
> > All warnings (new ones prefixed by >>):
>
> hi,
> we hit similar issue before:
> https://lore.kernel.org/bpf/CAMuHMdUaYP3-2JHk-OE9B-AWNU3ikhBdLyWDm0R8DwQpUS9eCw@xxxxxxxxxxxxxx/
>
> solution was to upgrade gcc
Thanks a lot for the info, the bot didn't handle this at that time. I will
fix the bot asap to avoid such false positives.
>
> jirka
>
>
> >
> > >> net/bpf/test_run.c:511:1: warning: 'retain' attribute ignored [-Wattributes]
> > 511 | {
> > | ^
> > net/bpf/test_run.c:557:1: warning: 'retain' attribute ignored [-Wattributes]
> > 557 | {
> > | ^
> > net/bpf/test_run.c:566:1: warning: 'retain' attribute ignored [-Wattributes]
> > 566 | {
> > | ^
> > net/bpf/test_run.c:573:1: warning: 'retain' attribute ignored [-Wattributes]
> > 573 | {
> > | ^
> > net/bpf/test_run.c:579:1: warning: 'retain' attribute ignored [-Wattributes]
> > 579 | {
> > | ^
> > net/bpf/test_run.c:608:1: warning: 'retain' attribute ignored [-Wattributes]
> > 608 | {
> > | ^
> > net/bpf/test_run.c:613:1: warning: 'retain' attribute ignored [-Wattributes]
> > 613 | {
> > | ^
> > net/bpf/test_run.c:619:1: warning: 'retain' attribute ignored [-Wattributes]
> > 619 | {
> > | ^
> > net/bpf/test_run.c:623:1: warning: 'retain' attribute ignored [-Wattributes]
> > 623 | {
> > | ^
> > --
> > >> net/core/filter.c:11863:1: warning: 'retain' attribute ignored [-Wattributes]
> > 11863 | {
> > | ^
> > net/core/filter.c:11876:1: warning: 'retain' attribute ignored [-Wattributes]
> > 11876 | {
> > | ^
> > net/core/filter.c:11889:1: warning: 'retain' attribute ignored [-Wattributes]
> > 11889 | {
> > | ^
> > net/core/filter.c:11910:1: warning: 'retain' attribute ignored [-Wattributes]
> > 11910 | {
> > | ^
> > net/core/filter.c:12096:1: warning: 'retain' attribute ignored [-Wattributes]
> > 12096 | {
> > | ^
> > --
> > >> net/core/xdp.c:713:1: warning: 'retain' attribute ignored [-Wattributes]
> > 713 | {
> > | ^
> > net/core/xdp.c:736:1: warning: 'retain' attribute ignored [-Wattributes]
> > 736 | {
> > | ^
> > net/core/xdp.c:769:1: warning: 'retain' attribute ignored [-Wattributes]
> > 769 | {
> > | ^
> > --
> > >> net/ipv4/tcp_cong.c:455:1: warning: 'retain' attribute ignored [-Wattributes]
> > 455 | {
> > | ^
> > net/ipv4/tcp_cong.c:469:1: warning: 'retain' attribute ignored [-Wattributes]
> > 469 | {
> > | ^
> > net/ipv4/tcp_cong.c:495:1: warning: 'retain' attribute ignored [-Wattributes]
> > 495 | {
> > | ^
> > net/ipv4/tcp_cong.c:514:1: warning: 'retain' attribute ignored [-Wattributes]
> > 514 | {
> > | ^
> > net/ipv4/tcp_cong.c:522:1: warning: 'retain' attribute ignored [-Wattributes]
> > 522 | {
> > | ^
> > --
> > >> net/ipv4/fou_bpf.c:46:1: warning: 'retain' attribute ignored [-Wattributes]
> > 46 | {
> > | ^
> > net/ipv4/fou_bpf.c:88:1: warning: 'retain' attribute ignored [-Wattributes]
> > 88 | {
> > | ^
> > --
> > >> net/ipv4/tcp_bbr.c:300:1: warning: 'retain' attribute ignored [-Wattributes]
> > 300 | {
> > | ^
> > net/ipv4/tcp_bbr.c:333:1: warning: 'retain' attribute ignored [-Wattributes]
> > 333 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1028:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1028 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1040:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1040 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1082:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1082 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1091:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1091 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1102:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1102 | {
> > | ^
> > net/ipv4/tcp_bbr.c:1130:1: warning: 'retain' attribute ignored [-Wattributes]
> > 1130 | {
> > | ^
> > --
> > >> net/ipv4/tcp_cubic.c:130:1: warning: 'retain' attribute ignored [-Wattributes]
> > 130 | {
> > | ^
> > net/ipv4/tcp_cubic.c:143:1: warning: 'retain' attribute ignored [-Wattributes]
> > 143 | {
> > | ^
> > net/ipv4/tcp_cubic.c:325:1: warning: 'retain' attribute ignored [-Wattributes]
> > 325 | {
> > | ^
> > net/ipv4/tcp_cubic.c:342:1: warning: 'retain' attribute ignored [-Wattributes]
> > 342 | {
> > | ^
> > net/ipv4/tcp_cubic.c:359:1: warning: 'retain' attribute ignored [-Wattributes]
> > 359 | {
> > | ^
> > net/ipv4/tcp_cubic.c:449:1: warning: 'retain' attribute ignored [-Wattributes]
> > 449 | {
> > | ^
> > --
> > >> net/ipv4/tcp_dctcp.c:90:1: warning: 'retain' attribute ignored [-Wattributes]
> > 90 | {
> > | ^
> > net/ipv4/tcp_dctcp.c:119:1: warning: 'retain' attribute ignored [-Wattributes]
> > 119 | {
> > | ^
> > net/ipv4/tcp_dctcp.c:128:1: warning: 'retain' attribute ignored [-Wattributes]
> > 128 | {
> > | ^
> > net/ipv4/tcp_dctcp.c:184:1: warning: 'retain' attribute ignored [-Wattributes]
> > 184 | {
> > | ^
> > net/ipv4/tcp_dctcp.c:194:1: warning: 'retain' attribute ignored [-Wattributes]
> > 194 | {
> > | ^
> > net/ipv4/tcp_dctcp.c:244:1: warning: 'retain' attribute ignored [-Wattributes]
> > 244 | {
> > | ^
> > --
> > >> fs/verity/measure.c:121:1: warning: 'retain' attribute ignored [-Wattributes]
> > 121 | {
> > | ^
> >
> >
> > vim +/retain +511 net/bpf/test_run.c
> >
> > 391145ba2accc4 Dave Marchevsky 2023-10-31 509
> > 400031e05adfce David Vernet 2023-02-01 510 __bpf_kfunc int bpf_fentry_test1(int a)
> > faeb2dce084aff Alexei Starovoitov 2019-11-14 @511 {
> > faeb2dce084aff Alexei Starovoitov 2019-11-14 512 return a + 1;
> > faeb2dce084aff Alexei Starovoitov 2019-11-14 513 }
> > 46565696434095 Kumar Kartikeya Dwivedi 2022-01-14 514 EXPORT_SYMBOL_GPL(bpf_fentry_test1);
> > faeb2dce084aff Alexei Starovoitov 2019-11-14 515
> >
> > :::::: The code at line 511 was first introduced by commit
> > :::::: faeb2dce084aff92d466c6ce68481989b815435b bpf: Add kernel test functions for fentry testing
> >
> > :::::: TO: Alexei Starovoitov <ast@xxxxxxxxxx>
> > :::::: CC: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>