linux/tools/testing
Jose E. Marchesi 52dbd67dff bpf: Abstract loop unrolling pragmas in BPF selftests
[Changes from V1:
- Avoid conflict by rebasing with latest master.]

Some BPF tests use loop unrolling compiler pragmas that are clang
specific and not supported by GCC.  These pragmas, along with their
GCC equivalences are:

  #pragma clang loop unroll_count(N)
  #pragma GCC unroll N

  #pragma clang loop unroll(full)
  #pragma GCC unroll 65534

  #pragma clang loop unroll(disable)
  #pragma GCC unroll 1

  #pragma unroll [aka #pragma clang loop unroll(enable)]
  There is no GCC equivalence to this pragma.  It enables unrolling on
  loops that the compiler would not ordinarily unroll even with
  -O2|-funroll-loops, but it is not equivalent to full unrolling
  either.

This patch adds a new header progs/bpf_compiler.h that defines the
following macros, which correspond to each pair of compiler-specific
pragmas above:

  __pragma_loop_unroll_count(N)
  __pragma_loop_unroll_full
  __pragma_loop_no_unroll
  __pragma_loop_unroll

The selftests using loop unrolling pragmas are then changed to include
the header and use these macros in place of the explicit pragmas.

Tested in bpf-next master.
No regressions.

Signed-off-by: Jose E. Marchesi <jose.marchesi@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/bpf/20240208203612.29611-1-jose.marchesi@oracle.com
2024-02-13 11:17:30 -08:00
..
crypto/chacha20-s390
cxl Merge branch 'for-6.8/cxl-cper' into for-6.8/cxl 2024-01-09 19:21:44 -08:00
fault-injection
ktest
kunit kunit: tool: add test for parsing attributes 2023-12-18 13:21:15 -07:00
memblock mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
nvdimm tools/testing/nvdimm: Add compile-test coverage for ndtest 2023-12-15 17:07:12 +01:00
radix-tree maple_tree: fix warning comparing pointer to 0 2023-12-20 14:48:12 -08:00
scatterlist
selftests bpf: Abstract loop unrolling pragmas in BPF selftests 2024-02-13 11:17:30 -08:00
vsock vsock/test: print type for SOCK_SEQPACKET 2024-01-25 16:39:21 -08:00