Re: [PATCH bpf-next] selftests/bpf: Fix build of task_pt_regs tests for arm64

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On Thu, Sep 02, 2021 at 11:09:26AM +0200, Jean-Philippe Brucker wrote:
> struct pt_regs is not exported to userspace on all archs. arm64 and s390
> export "user_pt_regs" instead, which causes build failure at the moment:
> 
>   progs/test_task_pt_regs.c:8:16: error: variable has incomplete type 'struct pt_regs'
>   struct pt_regs current_regs = {};
> 
> Use the multi-arch macros defined by tools/lib/bpf/bpf_tracing.h to copy
> the pt_regs into a locally-defined struct.
> 
> Copying the user_pt_regs struct on arm64 wouldn't work because the
> struct is too large and the compiler complains about using too much
> stack.
> 
> Fixes: 576d47bb1a92 ("bpf: selftests: Add bpf_task_pt_regs() selftest")
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
> ---
>  .../selftests/bpf/bpf_pt_regs_helpers.h       | 30 +++++++++++++++++++
>  .../selftests/bpf/prog_tests/task_pt_regs.c   |  1 +
>  .../selftests/bpf/progs/test_task_pt_regs.c   | 10 ++++---
>  3 files changed, 37 insertions(+), 4 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/bpf_pt_regs_helpers.h

Acked-by: Daniel Xu <dxu@xxxxxxxxx>

[...]



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