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

Hou Tao says:

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

From: Hou Tao <[email protected]>

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/[email protected]
====================

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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