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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fpaIzggVn5In6Ymrm3Yz+nwDUUGhrf8//GA+sGtnaGHwUHpmWFL37z69aI+l4fzytyD1wpSQuebHsU1X3zONKA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR10MB5650 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-30_06,2024-08-30_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2407110000 definitions=main-2408300086 X-Proofpoint-ORIG-GUID: 0VTAdqc9T0SXgcZJFQAfVV_hl_P2Ys6a X-Proofpoint-GUID: 0VTAdqc9T0SXgcZJFQAfVV_hl_P2Ys6a On 30/08/2024 12:15, Eduard Zingerman wrote: > On Fri, 2024-08-30 at 02:51 -0700, Tony Ambardar wrote: >> The pahole master branch recently added support for "distilled BTF" based >> on libbpf v1.5, but may add .BTF and .BTF.base sections with the wrong byte >> order (e.g. on s390x BPF CI), which then lead to kernel Oops when loaded. >> >> Fix by updating libbpf's btf__distill_base() and btf_new_empty() to retain >> the byte order of any source BTF objects when creating new ones. >> >> Reported-by: Song Liu >> Reported-by: Eduard Zingerman >> Suggested-by: Eduard Zingerman >> Link: https://lore.kernel.org/bpf/6358db36c5f68b07873a0a5be2d062b1af5ea5f8.camel@gmail.com/ >> Signed-off-by: Tony Ambardar >> --- > > Acked-by: Eduard Zingerman > Tested-by: Alan Maguire Thanks for the fix! > But we also need a test for this. Like the one attached. > Or Alan can share his test, which is much shorter but skips round trip to bytes and back. > Eduard's test is better than mine; mine was a simple addition to btf_endian() tests that checked split/distilled BTF matched endianness of the originating BTF for non-native endianness. Having actual non-native endianness _use_ as in Eduard's test is much preferred I think. > [...]