Merge branch 'libbpf: Fixes for ring buffer'

Hou Tao says:

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From: Hou Tao <houtao1@huawei.com>

Hi,

The patch set tries to fix the problems found when testing ringbuf by
using 4KB and 2GB size. Patch 1 fixes the probe of ring buffer map on
host with 64KB page (e.g., an ARM64 host). Patch 2 & 3 fix the overflow
of length when mmaping 2GB kernel ringbuf or user ringbuf on libbpf.
Patch 4 just reject the reservation with invalid size.

Please see individual patch for details. And comments are always
welcome.

Change Log:
v2:
 * patch 1: use page size instead of adjust_ringbuf_sz(4096) as main_entries (suggested by Stanislav)
 * patch 2 & 3: use "mmap_sz" instead of "ro_size/wr_size" as name of mmap length (From Andrii)
v1: https://lore.kernel.org/bpf/20221111092642.2333724-1-houtao@huaweicloud.com
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Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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