Merge branch 'bpf-use-gfp_kernel-in-bpf_event_entry_gen'

Hou Tao says:

====================
The simple patch set aims to replace GFP_ATOMIC by GFP_KERNEL in
bpf_event_entry_gen(). These two patches in the patch set were
preparatory patches in "Fix the release of inner map" patchset [1] and
are not needed for v2, so re-post it to bpf-next tree.

Patch #1 reduces the scope of rcu_read_lock when updating fd map and
patch #2 replaces GFP_ATOMIC by GFP_KERNEL. Please see individual
patches for more details.

Change Log:
v3:
 * patch #1: fallback to patch #1 in v1. Update comments in
             bpf_fd_htab_map_update_elem() to explain the reason for
	     rcu_read_lock() (Alexei)

v2: https://lore.kernel.org/bpf/20231211073843.1888058-1-houtao@huaweicloud.com/
 * patch #1: add rcu_read_lock/unlock() for bpf_fd_array_map_update_elem
             as well to make it consistent with
	     bpf_fd_htab_map_update_elem and update commit message
             accordingly (Alexei)
 * patch #1/#2: collects ack tags from Yonghong

v1: https://lore.kernel.org/bpf/20231208103357.2637299-1-houtao@huaweicloud.com/

[1]: https://lore.kernel.org/bpf/20231107140702.1891778-1-houtao@huaweicloud.com/
====================

Link: https://lore.kernel.org/r/20231214043010.3458072-1-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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