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Vlastimil Babka (SUSE)
a6172cca15
We have already disabled memory allocation profiling for objects allocated for KFENCE to avoid complexity. KFENCE allocations are rare and there can be only CONFIG_KFENCE_NUM_OBJECTS (default to 255) outstanding ones at any time, so they are among noise in the profiling stats. For the same reasons, we can stop memcg_kmem accounting of kfence objects as their memory usage will be negligible wrt any practical memcg limits. This allows us simplifying the code and getting rid of is_kfence_address() checks in various places, including slab_obj_ext()'s usage of obj_to_index(). Instead we rely on the fact that slab_obj_exts() will now always return 0 for a kfence object's fake slab, which makes those places unreachable. All we need to do to keep this assumption valid is not to allocate obj_exts for kfence objects, so the checks need to guard alloc_slab_obj_exts() where necessary. Suggested-by: Harry Yoo <[email protected]> Link: https://patch.msgid.link/[email protected] Reviewed-by: Hao Li <[email protected]> Signed-off-by: Vlastimil Babka (SUSE) <[email protected]>