tree e614f3998c793a4f826c3ff1f79430b948f5e95d
parent 5f4353379c5a46cdec88d0abe6aa627597698216
author Steven Rostedt <rostedt@goodmis.org> 1737063685 -0500
committer Steven Rostedt (Google) <rostedt@goodmis.org> 1737211251 -0500

tracing: gfp: Remove duplication of recording GFP flags

The gfp_flags when recorded in the trace require being converted from
their numbers to values. Various macros are used to help facilitate this,
but there's two sets of macros that need to keep track of the same GFP
flags to stay in sync.

The TRACE_GFP_FLAGS macro holds the enum ___GFP_*_BIT defined bits, and
creates the TRACE_DEFINE_ENUM() wrapper around them.

The __def_gfpflag_names() macro creates the mapping of various flags or
multiple flags to give them human readable names via the __print_flags()
tracing helper macro.

As the TRACE_GFP_FLAGS is a subset of the __def_gfpflags_names(), it can
be used to cover the individual bit names, by redefining the internal
macro TRACE_GFP_EM():

  #undef TRACE_GFP_EM
  #define TRACE_GFP_EM(a) gfpflag_string(__GFP_##a),

This will remove the bits that are duplicate between the two macros. If a
new bit is created, only the TRACE_GFP_FLAGS needs to be updated and that
will also update the __def_gfpflags_names() macro.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Veronika  Molnarova <vmolnaro@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/20250116214439.046082618@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>