selftests/bpf: Rename libarena struct bitmap to struct arena_bitmap

2026-07-08T03:15:34+00:00

When building bpf selftest with latest bpf-next, I got the following failure:

  In file included from /home/yhs/work/bpf-next/tools/testing/selftests/bpf/libarena/selftests/test_parallel_bitmap.bpf.c:8:
  /home/yhs/work/bpf-next/tools/testing/selftests/bpf/libarena/include/libarena/bitmap.h:11:8: error: redefinition of
        'bitmap'
     11 | struct bitmap {
        |        ^
  /home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/include/vmlinux.h:51320:8: note: previous definition is here
   51320 | struct bitmap {
         |        ^

The vmlinux.h struct bitmap comes from drivers/md/md-bitmap.c:
  struct bitmap {
	struct bitmap_counts { ... }
	...
  }

To fix the issue, I renamed libarena struct bitmap to arena_bitmap to avoid the conflict.

Signed-off-by: Yonghong Song 
Reviewed-by: Emil Tsalapatis 
Link: https://lore.kernel.org/bpf/20260707220136.910374-1-yonghong.song@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi

selftests/bpf: Add arena-based bitmap data structure

2026-07-07T16:09:06+00:00

Add an arena-based word-aligned bitmap data struture. The
structure is useful as a building block, e.g., sched-ext
uses it to represent cpumask structures.

Signed-off-by: Emil Tsalapatis 
Link: https://lore.kernel.org/bpf/20260706181730.21731-5-emil@etsalapatis.com
Signed-off-by: Kumar Kartikeya Dwivedi

linux-stable.git/tools/testing/selftests/bpf/libarena/src/bitmap.bpf.c, branch master

selftests/bpf: Rename libarena struct bitmap to struct arena_bitmap

selftests/bpf: Add arena-based bitmap data structure