Re: [PATCH bpf-next 0/4] selftests/bpf: Fix a few test failures with arm64 64KB page

[Ihor Solodrai <ihor.solodrai@linux.dev>]

On 6/6/25 9:30 AM, Andrii Nakryiko wrote:
> On Thu, Jun 5, 2025 at 8:23 PM Yonghong Song <yonghong.song@linux.dev> wrote:
>>
>> My local arm64 host has 64KB page size and the VM to run test_progs
>> also has 64KB page size. There are a few self tests assuming 4KB page
>> and hence failed in my envorinment. Patch 1 tries to reduce long assert
> 
> typo: environment
> 
>> logs when tail failed. Patches 2-4 fixed three selftest failures.
> 
> How come our BPF CI doesn't catch this on aarch64?.. Ihor, any thoughts?

Because our aarch64 hosts use 4K pagesize...

$ uname -a
Linux ip-10-0-0-103.us-west-1.compute.internal 
5.10.228-219.884.amzn2.aarch64 #1 SMP Wed Oct 23 17:17:31 UTC 2024 
aarch64 aarch64 aarch64 GNU/Linux
[ec2-user@ip-10-0-0-103 ~]$ getconf PAGESIZE
4096


> 
>>
>> Yonghong Song (4):
>>    selftests/bpf: Reduce test_xdp_adjust_frags_tail_grow logs
>>    selftests/bpf: Fix bpf_mod_race test failure with arm64 64KB page size
>>    selftests/bpf: Fix ringbuf/ringbuf_write test failure with arm64 64KB
>>      page size
>>    selftests/bpf: Fix a user_ringbuf failure with arm64 64KB page size
>>
>>   .../selftests/bpf/prog_tests/bpf_mod_race.c    |  2 +-
>>   .../testing/selftests/bpf/prog_tests/ringbuf.c |  5 +++--
>>   .../selftests/bpf/prog_tests/user_ringbuf.c    |  6 ++++--
>>   .../selftests/bpf/prog_tests/xdp_adjust_tail.c | 18 ++++++++++++------
>>   .../selftests/bpf/progs/test_ringbuf_write.c   |  5 +++--
>>   5 files changed, 23 insertions(+), 13 deletions(-)
>>
>> --
>> 2.47.1
>>