Now that all bits are in place to allow ftrace to pass its trace data
into the next kernel on kexec, let's give users a kconfig option to
enable the functionality.
Signed-off-by: Alexander Graf <graf@xxxxxxxxxx>
---
v1 -> v2:
- Select crc32
---
kernel/trace/Kconfig | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 61c541c36596..418a5ae11aac 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -1169,6 +1169,20 @@ config HIST_TRIGGERS_DEBUG
If unsure, say N.
+config FTRACE_KHO
+ bool "Ftrace Kexec handover support"
+ depends on KEXEC_KHO
+ select CRC32
+ help
+ Enable support for ftrace to pass metadata across kexec so the new
+ kernel continues to use the previous kernel's trace buffers.
+
+ This can be useful when debugging kexec performance or correctness
+ issues: The new kernel can dump the old kernel's trace buffer which
+ contains all events until reboot.
+
+ If unsure, say N.
+
source "kernel/trace/rv/Kconfig"
endif # FTRACE
--
2.40.1
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10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
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