From f39000f5240e577347d2cdae8fd9bcb710fe7325 Mon Sep 17 00:00:00 2001
From: "fj1508ic@fujitsu.com" <fj1508ic@fujitsu.com>
Date: Tue, 26 Jan 2021 06:37:28 +0000
Subject: [PATCH] Remove trace_buf_size and trace_event from the kernel
 bootparameters of the kdump kernel

The kdump kernel uses resources for ftrace because trace_buf_size, which
specifies the ring buffer size for ftrace, and trace_event, which specifies
a valid trace event, are not removed, but the kdump kernel does not require
ftrace.

trace_buf_size is ignored if the specified size is 0, so specify 1.

Signed-off-by: Hisashi Nagaoka <fj1508ic@fujitsu.com>
Acked-by: Kairui Song <kasong@redhat.com>
---
 kdump-lib.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 46e5e03..537d5f8 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -821,6 +821,10 @@ prepare_cmdline()
         fi
     done
 
+    # Remove trace_buf_size, trace_event
+    cmdline=$(remove_cmdline_param "$cmdline" trace_buf_size trace_event)
+    cmdline="${cmdline} trace_buf_size=1"
+
     echo ${cmdline}
 }