tracing/filters: Dynamically allocate filter_pred.regex

Every predicate allocation includes a MAX_FILTER_STR_VAL (256) char array
in the regex field, even if the predicate function does not use the field.

A later commit will introduce a dynamically allocated cpumask to struct
filter_pred, which will require a dedicated freeing function. Bite the
bullet and make filter_pred.regex dynamically allocated.

While at it, reorder the fields of filter_pred to fill in the byte
holes. The struct now fits on a single cacheline.

No change in behaviour intended.

The kfree()'s were patched via Coccinelle:
  @@
  struct filter_pred *pred;
  @@

  -kfree(pred);
  +free_predicate(pred);

Link: https://lkml.kernel.org/r/[email protected]

Cc: Masami Hiramatsu <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Daniel Bristot de Oliveira <[email protected]>
Cc: Marcelo Tosatti <[email protected]>
Cc: Leonardo Bras <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Signed-off-by: Valentin Schneider <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

0 files changed, 0 insertions, 0 deletions