[PATCH v2] perf libunwind: Fixup conversion perf_sample->user_regs to a pointer

[Namhyung Kim]

On Wed, 12 Mar 2025 20:31:21 -0700, Ian Rogers wrote:
> The dc6d2bc2d893a878 ("perf sample: Make user_regs and intr_regs optional") misses
> the changes to a file, resulting in this problem:
> 
>   $ make LIBUNWIND=1 -C tools/perf O=/tmp/build/perf-tools-next install-bin
>   <SNIP>
>     CC      /tmp/build/perf-tools-next/util/unwind-libunwind-local.o
>     CC      /tmp/build/perf-tools-next/util/unwind-libunwind.o
>   <SNIP>
>   util/unwind-libunwind-local.c: In function ‘access_mem’:
>   util/unwind-libunwind-local.c:582:56: error: ‘ui->sample->user_regs’ is a pointer; did you mean to use ‘->’?
>     582 |         if (__write || !stack || !ui->sample->user_regs.regs) {
>         |                                                        ^
>         |                                                        ->
>   util/unwind-libunwind-local.c:587:38: error: passing argument 2 of ‘perf_reg_value’ from incompatible pointer type [-Wincompatible-pointer-types]
>     587 |         ret = perf_reg_value(&start, &ui->sample->user_regs,
>         |                                      ^~~~~~~~~~~~~~~~~~~~~~
>         |                                      |
>         |                                      struct regs_dump **
> <SNIP>
>   ⬢ [acme at toolbox perf-tools-next]$ git bisect bad
>   dc6d2bc2d893a878e7b58578ff01b4738708deb4 is the first bad commit
>   commit dc6d2bc2d893a878e7b58578ff01b4738708deb4 (HEAD)
>   Author: Ian Rogers <irogers at google.com>
>   Date:   Mon Jan 13 11:43:45 2025 -0800
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung