From: Alexei Starovoitov <ast@kernel.org>
Date: Sun, 4 Dec 2022 20:52:40 +0000 (-0800)
Subject: Merge branch 'bpf: Handle MEM_RCU type properly'
X-Git-Tag: v6.2-rc1~99^2~23^2~29
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1910676cc1ec29fad850448ead0fffdb93fb74b5;p=thirdparty%2Fkernel%2Flinux.git

Merge branch 'bpf: Handle MEM_RCU type properly'

Yonghong Song says:

====================

Patch set [1] added rcu support for bpf programs. In [1], a rcu
pointer is considered to be trusted and not null. This is actually
not true in some cases. The rcu pointer could be null, and for non-null
rcu pointer, it may have reference count of 0. This small patch set
fixed this problem. Patch 1 is the kernel fix. Patch 2 adjusted
selftests properly. Patch 3 added documentation for newly-introduced
KF_RCU flag.

  [1] https://lore.kernel.org/all/20221124053201.2372298-1-yhs@fb.com/

Changelogs:
  v1 -> v2:
    - rcu ptr could be NULL.
    - non_null_rcu_ptr->rcu_field can be marked as MEM_RCU as well.
    - Adjust the code to avoid existing error message change.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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1910676cc1ec29fad850448ead0fffdb93fb74b5