Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
bpf-next-for-netdev
The following pull-request contains BPF updates for your *net-next* tree.

We've added 22 non-merge commits during the last 3 day(s) which contain
a total of 23 files changed, 652 insertions(+), 431 deletions(-).

The main changes are:

1) Add verifier support for annotating user's global BPF subprogram arguments
   with few commonly requested annotations for a better developer experience,
   from Andrii Nakryiko.

   These tags are:
     - Ability to annotate a special PTR_TO_CTX argument
     - Ability to annotate a generic PTR_TO_MEM as non-NULL

2) Support BPF verifier tracking of BPF_JNE which helps cases when the compiler
   transforms (unsigned) "a > 0" into "if a == 0 goto xxx" and the like, from
   Menglong Dong.

3) Fix a warning in bpf_mem_cache's check_obj_size() as reported by LKP, from Hou Tao.

4) Re-support uid/gid options when mounting bpffs which had to be reverted with
   the prior token series revert to avoid conflicts, from Daniel Borkmann.

5) Fix a libbpf NULL pointer dereference in bpf_object__collect_prog_relos() found
   from fuzzing the library with malformed ELF files, from Mingyi Zhang.

6) Skip DWARF sections in libbpf's linker sanity check given compiler options to
   generate compressed debug sections can trigger a rejection due to misalignment,
   from Alyssa Ross.

7) Fix an unnecessary use of the comma operator in BPF verifier, from Simon Horman.

8) Fix format specifier for unsigned long values in cpustat sample, from Colin Ian King.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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