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android_kernel_motorola_sm6375/mm
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Filename Latest commit message Latest commit date
Andrii Nakryiko 0b23e4c575
 BACKPORT: bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY 
Add ability to memory-map contents of BPF array map. This is extremely useful
for working with BPF global data from userspace programs. It allows to avoid
typical bpf_map_{lookup,update}_elem operations, improving both performance
and usability.

There had to be special considerations for map freezing, to avoid having
writable memory view into a frozen map. To solve this issue, map freezing and
mmap-ing is happening under mutex now:
  - if map is already frozen, no writable mapping is allowed;
  - if map has writable memory mappings active (accounted in map->writecnt),
    map freezing will keep failing with -EBUSY;
  - once number of writable memory mappings drops to zero, map freezing can be
    performed again.

Only non-per-CPU plain arrays are supported right now. Maps with spinlocks
can't be memory mapped either.

For BPF_F_MMAPABLE array, memory allocation has to be done through vmalloc()
to be mmap()'able. We also need to make sure that array data memory is
page-sized and page-aligned, so we over-allocate memory in such a way that
struct bpf_array is at the end of a single page of memory with array->value
being aligned with the start of the second page. On deallocation we need to
accomodate this memory arrangement to free vmalloc()'ed memory correctly.

One important consideration regarding how memory-mapping subsystem functions.
Memory-mapping subsystem provides few optional callbacks, among them open()
and close().  close() is called for each memory region that is unmapped, so
that users can decrease their reference counters and free up resources, if
necessary. open() is *almost* symmetrical: it's called for each memory region
that is being mapped, **except** the very first one. So bpf_map_mmap does
initial refcnt bump, while open() will do any extra ones after that. Thus
number of close() calls is equal to number of open() calls plus one more.

Change-Id: Iec61232f89b9cdf29587eb265a61730d6f4925e1
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/bpf/20191117172806.2195367-4-andriin@fb.com
2025-12-23 13:35:42 -08:00
..
kasan Merge android11-5.4.233+ (4716ccc) into msm-5.4 2023-05-30 11:16:10 +05:30
backing-dev.c mm: bdi: initialize bdi_min_ratio when bdi is unregistered 2021-12-14 14:49:00 +01:00
balloon_compaction.c
cleancache.c
cma.c Merge android11-5.4.265+ (a34cc1d) into msm-5.4 2024-02-29 15:10:56 +05:30
cma.h
cma_debug.c Revert "Revert "mm: cma: make writeable CMA debugfs optional"" 2020-12-17 15:22:06 +05:30
compaction.c Merge tag 'ASB-2024-06-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2024-06-22 17:58:09 +03:00
debug.c mm/debug.c: always print flags in dump_page() 2020-03-05 16:43:51 +01:00
debug_page_ref.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c Merge tag 'ASB-2025-10-06_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:17:54 +03:00
frame_vector.c v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails 2022-12-08 11:23:06 +01:00
frontswap.c treewide: Remove uninitialized_var() usage 2023-06-09 10:29:01 +02:00
gup.c BACKPORT: mm/gup: Remove enfornced COW mechanism 2025-05-18 08:08:42 +00:00
gup_benchmark.c
highmem.c
hmm.c mm/hmm: move pmd_to_hmm_pfn_flags() to the respective #ifdeffery 2025-08-28 16:21:34 +02:00
huge_memory.c Merge tag 'ASB-2025-08-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-09-01 13:17:46 +03:00
hugetlb.c Merge tag 'ASB-2025-12-01_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-12-04 19:21:35 +02:00
hugetlb_cgroup.c
hwpoison-inject.c
init-mm.c Revert "mm: protect mm_rb tree with a rwlock" 2025-05-24 05:44:05 +00:00
internal.h Revert "mm: protect mm_rb tree with a rwlock" 2025-05-24 05:44:05 +00:00
interval_tree.c
Kconfig Revert "mm: introduce CONFIG_SPECULATIVE_PAGE_FAULT" 2025-05-24 05:44:57 +00:00
Kconfig.debug mm, page_owner: set page owner info for tail pages 2020-02-27 15:13:14 -08:00
khugepaged.c mm/khugepaged: fix the address passed to notifier on testing young 2025-10-02 13:34:28 +02:00
kmemleak-test.c
kmemleak.c mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock 2025-08-28 16:21:34 +02:00
ksm.c Merge android11-5.4.249+ (d57e792) into msm-5.4 2023-09-28 16:45:28 +05:30
list_lru.c mm: list_lru: set shrinker map bit when child nr_items is not zero 2020-12-11 13:23:31 +01:00
maccess.c UPSTREAM: uaccess: Add strict non-pagefault kernel-space read function 2025-12-23 13:35:39 -08:00
madvise.c Merge tag 'ASB-2025-10-06_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:17:54 +03:00
Makefile Merge tag 'ASB-2024-05-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2024-05-07 20:29:15 +03:00
memblock.c This is the 5.4.232 stable release 2023-02-22 12:30:48 +00:00
memcontrol.c memcg: always call cond_resched() after fn() 2025-06-04 14:32:35 +02:00
memfd.c memfd: fix F_SEAL_WRITE after shmem huge page allocated 2022-03-08 19:07:49 +01:00
memory-failure.c Merge branch 'android11-5.4-lts' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:23:13 +03:00
memory.c Revert "mm: prepare for FAULT_FLAG_SPECULATIVE" 2025-05-24 05:44:31 +00:00
memory_hotplug.c Merge android11-5.4.161+ (b9d179c) into msm-5.4 2022-02-07 22:29:21 +05:30
mempolicy.c Revert "mm: protect VMA modifications using VMA sequence count" 2025-05-24 05:44:09 +00:00
mempool.c
memremap.c
memtest.c memtest: use {READ,WRITE}_ONCE in memory scanning 2024-04-13 12:51:27 +02:00
migrate.c Merge branch 'android11-5.4-lts' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:23:13 +03:00
mincore.c
mlock.c Revert "mm: protect VMA modifications using VMA sequence count" 2025-05-24 05:44:09 +00:00
mm_init.c
mmap.c This is the 5.4.297 stable release 2025-09-02 10:52:40 +00:00
mmu_context.c mm: fix kthread_use_mm() vs TLB invalidate 2020-09-03 11:26:51 +02:00
mmu_gather.c mm/khugepaged: fix GUP-fast interaction by sending IPI 2022-12-14 11:30:42 +01:00
mmu_notifier.c
mmzone.c arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL 2022-05-15 19:54:46 +02:00
mprotect.c Revert "mm: protect VMA modifications using VMA sequence count" 2025-05-24 05:44:09 +00:00
mremap.c Revert "mm: protect mremap() against SPF hanlder" 2025-05-24 05:44:08 +00:00
msync.c
nommu.c x86/mm: split vmalloc_sync_all() 2020-03-25 08:25:58 +01:00
oom_kill.c Merge tag 'ASB-2025-05-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-05-18 08:00:20 +00:00
OWNERS ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS 2021-04-01 13:45:14 +00:00
page-writeback.c mm: fix ratelimit_pages update error in dirty_ratio_handler() 2025-06-27 11:02:52 +01:00
page_alloc.c Merge branch 'android11-5.4-lts' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-12-11 01:41:51 -08:00
page_counter.c Revert "ANDROID: Revert: Merge 5.4.60 into android11-5.4" 2020-08-23 13:12:51 +02:00
page_ext.c mm: fix the page_owner initializing issue for arm32 2020-09-29 12:42:42 +08:00
page_idle.c BACKPORT: mm: don't be stuck to rmap lock on reclaim path 2023-01-13 08:56:32 +00:00
page_io.c Merge android11-5.4.197+ (3970bc6) into msm-5.4 2022-08-16 16:52:01 +05:30
page_isolation.c mm/memory_hotplug: drain per-cpu pages again during memory offline 2020-11-23 17:03:25 +05:30
page_owner.c mm: page_owner: Fix -Wstrlcpy-strlcat-size 2025-04-26 21:17:21 +03:00
page_poison.c debug-pagealloc: Panic on pagealloc corruption 2020-08-25 11:46:48 -07:00
page_vma_mapped.c mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk() 2021-06-30 08:47:55 -04:00
pagewalk.c mm: pagewalk: Fix race between unmap and page walker 2022-10-15 07:54:36 +02:00
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c treewide: Remove uninitialized_var() usage 2023-06-09 10:29:01 +02:00
pgsize_migration.c ANDROID: 16K: Allocate pad vma on the stack 2025-08-22 07:07:13 -07:00
pgtable-generic.c mm/thp: fix __split_huge_pmd_locked() on shmem migration entry 2021-06-30 08:47:52 -04:00
process_vm_access.c
readahead.c vfs: fix readahead(2) on block devices 2023-11-20 10:30:08 +01:00
rmap.c Revert "mm: introduce __page_add_new_anon_rmap()" 2025-05-24 05:44:06 +00:00
rodata_test.c
shmem.c Merge tag 'ASB-2025-10-06_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:17:54 +03:00
showmem.c
shuffle.c mm/shuffle: don't move pages between zones and don't read garbage memmaps 2020-09-03 11:26:51 +02:00
shuffle.h
slab.c soc: qcom: Enable slabinfo support in minidump 2020-09-07 09:23:52 -07:00
slab.h mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag 2021-11-26 10:47:21 +01:00
slab_common.c Merge tag 'ASB-2024-12-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2024-12-17 03:24:53 +02:00
slob.c UPSTREAM: mm/sl[uo]b: export __kmalloc_track(_node)_caller 2020-11-02 16:12:00 +00:00
slub.c Merge tag 'ASB-2025-10-06_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:17:54 +03:00
sparse-vmemmap.c
sparse.c mm/sparse: add the missing sparse_buffer_fini() in error branch 2021-05-14 09:44:32 +02:00
swap.c Revert "mm: introduce __lru_cache_add_active_or_unevictable" 2025-05-24 05:44:06 +00:00
swap_cgroup.c
swap_slots.c
swap_state.c Revert "mm: protect VMA modifications using VMA sequence count" 2025-05-24 05:44:09 +00:00
swapfile.c This is the 5.4.285 stable release 2024-11-09 11:29:17 +00:00
truncate.c mm/thp: unmap_mapping_page() to fix THP truncate_cleanup_page() 2021-06-30 08:47:53 -04:00
usercopy.c Merge android11-5.4.191+ (375c2e2) into msm-5.4 2022-06-09 11:43:23 +05:30
userfaultfd.c UPSTREAM: mm/shmem: use page_mapping() to detect page cache for uffd continue 2025-05-18 08:08:42 +00:00
util.c mm: only enforce minimum stack gap size if it's sensible 2024-11-08 16:20:35 +01:00
vmacache.c
vmalloc.c BACKPORT: bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY 2025-12-23 13:35:42 -08:00
vmpressure.c
vmscan.c Merge tag 'ASB-2025-06-05_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-06-30 10:49:17 +03:00
vmstat.c Revert "mm: add speculative page fault vmstats" 2025-05-24 05:44:04 +00:00
workingset.c mm: workingset: remove zero-seek setting for shadow node shrinker 2020-04-06 23:51:59 -07:00
z3fold.c mm/z3fold: fix potential memory leak in z3fold_destroy_pool() 2021-07-14 16:53:47 +02:00
zbud.c
zpool.c
zsmalloc.c Merge tag 'ASB-2025-10-06_11-5.4' of https://android.googlesource.com/kernel/common into android13-5.4-lahaina 2025-10-08 15:17:54 +03:00
zswap.c