Merge branch 'bpf-riscv64-support-load-acquire-and-store-release-instructions'

Merge branch 'bpf-riscv64-support-load-acquire-and-store-release-instructions'

Peilin Ye says:

====================
bpf, riscv64: Support load-acquire and store-release instructions

Hi all!

Patchset [1] introduced BPF load-acquire (BPF_LOAD_ACQ) and
store-release (BPF_STORE_REL) instructions, and added x86-64 and arm64
JIT compiler support.  As a follow-up, this v2 patchset supports
load-acquire and store-release instructions for the riscv64 JIT
compiler, and introduces some related selftests/ changes.

Specifically:

 * PATCH 1 makes insn_def_regno() handle load-acquires properly for
   bpf_jit_needs_zext() (true for riscv64) architectures
 * PATCH 2, 3 from Andrea Parri add the actual support to the riscv64
   JIT compiler
 * PATCH 4 optimizes code emission by skipping redundant zext
   instructions inserted by the verifier
 * PATCH 5, 6 and 7 are minor selftest/ improvements
 * PATCH 8 enables (non-arena) load-acquire/store-release selftests for
   riscv64

v1: https://lore.kernel.org/bpf/cover.1745970908.git.yepeilin@google.com/
Changes since v1:

 * add Acked-by:, Reviewed-by: and Tested-by: tags from Lehui and Björn
 * simplify code logic in PATCH 1 (Lehui)
 * in PATCH 3, avoid changing 'return 0;' to 'return ret;' at the end of
   bpf_jit_emit_insn() (Lehui)

Please refer to individual patches for details.  Thanks!

[1] https://lore.kernel.org/all/cover.1741049567.git.yepeilin@google.com/
====================

Link: https://patch.msgid.link/cover.1746588351.git.yepeilin@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>