Merge branch 'fix-the-unmatched-unit_size-of-bpf_mem_cache'

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Hou Tao says:

====================
Fix the unmatched unit_size of bpf_mem_cache

From: Hou Tao <houtao1@huawei.com>

Hi,

The patchset aims to fix the reported warning [0] when the unit_size of
bpf_mem_cache is mismatched with the object size of underly slab-cache.

Patch #1 fixes the warning by adjusting size_index according to the
value of KMALLOC_MIN_SIZE, so bpf_mem_cache with unit_size which is
smaller than KMALLOC_MIN_SIZE or is not aligned with KMALLOC_MIN_SIZE
will be redirected to bpf_mem_cache with bigger unit_size. Patch #2
doesn't do prefill for these redirected bpf_mem_cache to save memory.
Patch #3 adds further error check in bpf_mem_alloc_init() to ensure the
unit_size and object_size are always matched and to prevent potential
issues due to the mismatch.

Please see individual patches for more details. And comments are always
welcome.

[0]: https://lore.kernel.org/bpf/87jztjmmy4.fsf@all.your.base.are.belong.to.us
====================

Link: https://lore.kernel.org/r/20230908133923.2675053-1-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Alexei Starovoitov 2023-09-11 12:41:37 -07:00

parent 7182e56411 f0a42ab589

commit 9458964a6d

3 changed files with 256 additions and 4 deletions

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87

kernel/bpf/memalloc.c

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50

tools/testing/selftests/bpf/prog_tests/test_bpf_ma.c

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123

tools/testing/selftests/bpf/progs/test_bpf_ma.c

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