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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: eMfMrZi/9FB/A3iNrant880QZeVUDsDNMlqt26jtHUyCaWTU6NxIMy29r8Sx7597eZPCwIIq2mw8LaAklZPdrQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR10MB6742 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-29_04,2025-10-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0 suspectscore=0 phishscore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510240000 definitions=main-2510290065 X-Proofpoint-GUID: shmj9FqF4hHDjACD7UWZ9yy-J3JZJAWx X-Proofpoint-ORIG-GUID: shmj9FqF4hHDjACD7UWZ9yy-J3JZJAWx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI5MDAzNCBTYWx0ZWRfX9s7R665XAYi9 qM5Cqcign0UdnT+aIDjRYVP9zo+N/S+5yMf/UzXN6vwpZWPb3o31w+tt1IjBncY3a6vp4Ml4JFR eUbO0+n2/K+olasxt34wQjzHsZjGf3n4+71MqeheUh+d4wbvZjqR3hHEI7wBQ/vcjQw3Je8FUZB W1bCyZMWNavcaQWFI1iDK0qCeVy4BLBNV2pKDfrrz4zQOGtGbfeu6br6mhjkRodTDAGgZ4DOXJH FORzFGiLMswrNGnyKGph4Df0lw45jL2039LSVkO3GCtzBrqeUKGkwE/Z/NrE6j+EgrWKKmbGwB/ 2FRUsGYNXySLUh/sMDgULIrnoxATaD17ylmsFee3hCPQp6+jFUIY6tlUNlMoJRrs860AkpTm8Rw TINEzMWZ4GqzciyLUZPoCAdQ8hIaiSR+dmByzqo1Ipx48mfjWwA= X-Authority-Analysis: v=2.4 cv=S4LUAYsP c=1 sm=1 tr=0 ts=6901d52a b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=7umB1LHiOwhAnYfhuKoA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12123 On Tue, Oct 28, 2025 at 10:55:39AM -0700, Suren Baghdasaryan wrote: > On Mon, Oct 27, 2025 at 5:29 AM Harry Yoo wrote: > > > > Currently, the slab allocator assumes that slab->obj_exts is a pointer > > to an array of struct slabobj_ext objects. However, to support storage > > methods where struct slabobj_ext is embedded within objects, the slab > > allocator should not make this assumption. Instead of directly > > dereferencing the slabobj_exts array, abstract access to > > struct slabobj_ext via helper functions. > > > > Introduce a new API slabobj_ext metadata access: > > > > slab_obj_ext(slab, obj_exts, index) - returns the pointer to > > struct slabobj_ext element at the given index. > > > > Directly dereferencing the return value of slab_obj_exts() is no longer > > allowed. Instead, slab_obj_ext() must always be used to access > > individual struct slabobj_ext objects. > > If direct access to the vector is not allowed, it would be better to > eliminate slab_obj_exts() function completely and use the new > slab_obj_ext() instead. I think that's possible. We might need an > additional `bool is_slab_obj_exts()` helper for an early check before > we calculate the object index but that's quite easy. Good point, but that way we cannot avoid reading slab->obj_exts multiple times when we access slabobj_ext of multiple objects as it's accessed via READ_ONCE(). -- Cheers, Harry / Hyeonggon