Subject: linux-next: build failure after merge of the perf tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 27 Mar 2025 10:22:34 +1100

Hi all,

After merging the perf tree, today's linux-next build (native ppc perf)
failed like this:

perf/util/bpf-filter-flex.c:2245:1: error: unterminated comment
 2245 | /** Pushes the new state onto the stack. The new state becomes
      | ^
perf/util/bpf-filter-flex.c:20:31: error: 'perf_bpf_filter_ensure_buffer_stack' used but never defined [-Werror]
   20 | #define yyensure_buffer_stack perf_bpf_filter_ensure_buffer_stack
      |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
perf/util/bpf-filter-flex.c:550:13: note: in expansion of macro 'yyensure_buffer_stack'
  550 | static void yyensure_buffer_stack ( void );
      |             ^~~~~~~~~~~~~~~~~~~~~
perf/util/bpf-filter-flex.c:606:24: error: 'yy_fatal_error' used but never defined [-Werror]
  606 | static void yynoreturn yy_fatal_error ( const char* msg  );
      |                        ^~~~~~~~~~~~~~
perf/util/bpf-filter-flex.c:510:15: error: 'yy_buffer_stack_max' defined but not used [-Werror=unused-variable]
  510 | static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
      |               ^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

I don't know what caused this, but simply rebuilding worked.  So maybe
some dependency is missing in the make files?

-- 
Cheers,
Stephen Rothwell