[PATCH 1/5] tools/bootconfig: Read the documented ftrace.notraces key

[Eduardo Mucelli Rezende Oliveira <edumucelli@gmail.com>]

The boot-time tracing documentation and trace_boot_set_ftrace_filter()
use ftrace.notraces for function exclusions. bconf2ftrace.sh instead looks
up ftrace.notrace, so the documented option produces no writes to
set_ftrace_notrace. This affects both the root instance and named ones.

Read the documented key so that the script applies the same exclusions
as the in-kernel bootconfig consumer.

Fixes: 7e66ef0046cc ("tools/bootconfig: Add a script to generate ftrace shell-command from bootconfig")
Link: https://docs.kernel.org/trace/boottime-trace.html#ftrace-per-instance-options
Signed-off-by: Eduardo Mucelli Rezende Oliveira <edumucelli@gmail.com>
---
I tested the documented ftrace.notraces setting with one and two function
names in a temporary tracefs instance on my Ubuntu machine, running
kernel 7.0.0-38-generic, with recording disabled. The original script
installed neither exclusion; the fixed script installed both exactly.
Fixture checks also cover the root instance, named instances, arrays,
an absent setting and the unchanged positive-filter path.

 tools/bootconfig/scripts/bconf2ftrace.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bootconfig/scripts/bconf2ftrace.sh b/tools/bootconfig/scripts/bconf2ftrace.sh
index 7745c97e7abd..e5a833171b57 100755
--- a/tools/bootconfig/scripts/bconf2ftrace.sh
+++ b/tools/bootconfig/scripts/bconf2ftrace.sh
@@ -258,7 +258,7 @@ setup_instance() { # [instance]
 	set_value_of ${instance}.tracer ${instancedir}/current_tracer
 	set_array_of ${instance}.ftrace.filters \
 		${instancedir}/set_ftrace_filter
-	set_array_of ${instance}.ftrace.notrace \
+	set_array_of ${instance}.ftrace.notraces \
 		${instancedir}/set_ftrace_notrace
 
 	if xbc_has_key ${instance}.alloc_snapshot; then
-- 
2.53.0