The SLAB allocator has been deprecated since 6.5 and nobody has objected so far. As we agreed at LSF/MM, we should wait with the removal until the next LTS kernel is released. AFAIK that version hasn't been announced yet, but assuming it would be 6.7, we can aim for 6.8 and start exposing the removal to linux-next during the 6.7 cycle. To keep the series reasonably sized and not pull in people from other subsystems than mm and closely related ones, I didn't attempt to remove every trace of unnecessary reference to dead config options in external areas, nor in the defconfigs. Such cleanups can be sent to and handled by respective maintainers after this is merged. Instead I have added some patches aimed to reap some immediate benefits of the removal, mainly by not having to split some fastpath code between slab_common.c and slub.c anymore. But that is also not an exhaustive effort and I expect more cleanups and optimizations will follow later. Patch 08 updates CREDITS for the removed mm/slab.c. Please point out if I missed someone not yet credited. Git version: https://git.kernel.org/vbabka/l/slab-remove-slab-v1r4 Vlastimil Babka (20): mm/slab: remove CONFIG_SLAB from all Kconfig and Makefile KASAN: remove code paths guarded by CONFIG_SLAB KFENCE: cleanup kfence_guarded_alloc() after CONFIG_SLAB removal mm/memcontrol: remove CONFIG_SLAB #ifdef guards cpu/hotplug: remove CPUHP_SLAB_PREPARE hooks mm/slab: remove CONFIG_SLAB code from slab common code mm/mempool/dmapool: remove CONFIG_DEBUG_SLAB ifdefs mm/slab: remove mm/slab.c and slab_def.h mm/slab: move struct kmem_cache_cpu declaration to slub.c mm/slab: move the rest of slub_def.h to mm/slab.h mm/slab: consolidate includes in the internal mm/slab.h mm/slab: move pre/post-alloc hooks from slab.h to slub.c mm/slab: move memcg related functions from slab.h to slub.c mm/slab: move struct kmem_cache_node from slab.h to slub.c mm/slab: move kfree() from slab_common.c to slub.c mm/slab: move kmalloc_slab() to mm/slab.h mm/slab: move kmalloc() functions from slab_common.c to slub.c mm/slub: remove slab_alloc() and __kmem_cache_alloc_lru() wrappers mm/slub: optimize alloc fastpath code layout mm/slub: optimize free fast path code layout CREDITS | 12 +- arch/arm64/Kconfig | 2 +- arch/s390/Kconfig | 2 +- arch/x86/Kconfig | 2 +- include/linux/slab.h | 21 +- include/linux/slab_def.h | 124 -- include/linux/slub_def.h | 204 -- kernel/cpu.c | 5 - lib/Kconfig.debug | 1 - lib/Kconfig.kasan | 11 +- lib/Kconfig.kfence | 2 +- lib/Kconfig.kmsan | 2 +- mm/Kconfig | 50 +- mm/Kconfig.debug | 16 +- mm/Makefile | 6 +- mm/dmapool.c | 2 +- mm/kasan/common.c | 13 +- mm/kasan/kasan.h | 3 +- mm/kasan/quarantine.c | 7 - mm/kasan/report.c | 1 + mm/kfence/core.c | 4 - mm/memcontrol.c | 6 +- mm/mempool.c | 6 +- mm/slab.c | 4026 -------------------------------------- mm/slab.h | 550 ++---- mm/slab_common.c | 231 +-- mm/slub.c | 597 +++++- 27 files changed, 784 insertions(+), 5122 deletions(-) delete mode 100644 include/linux/slab_def.h delete mode 100644 include/linux/slub_def.h delete mode 100644 mm/slab.c -- 2.42.1
