selftests/bpf: Don't cast a pointer to .bss in arena_htab_asm

arena_htab_asm is arena_htab.c with BPF_ARENA_FORCE_ASM. In this variant
__arena has no address space, so arr1 is in .bss, and cast_kern() is a real
insn. cast_kern(arr) turns the pointer to .bss into an offset in the arena.
Each of the 100000 stores to arr[i] faults, and the fault handler of the
arena skips it.

Remove the cast. In the other variant it is a nop. The prog takes 67 ms in
place of 950 ms on a kernel with lockdep.

With one time slice for all may_goto of a prog, may_goto stops the loops of
the old prog after 250 ms. The test does not see that, because it looks at
the first keys only.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261031215543.682284-3-alexei.starovoitov@gmail.com

0 files changed, 0 insertions, 0 deletions