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Check tracing dir and add alternate if usual debugfs one isn't mounted #1

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Check tracing dir and add alternate if usual debugfs one isn't mounted #1

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15 changes: 15 additions & 0 deletions kernel/kprobe
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Original file line number Diff line number Diff line change
Expand Up @@ -194,6 +194,21 @@ if (( debug )); then
echo "kname: $kname, kprobe: $kprobe"
fi

# It's possible - esp on a production kernel - that CONFIG_DEBUG_FS_DISALLOW_MOUNT=y
# which implies that though the debugfs filesystem's APIs are available, the
# fs itself isn't mounted - it's invisible. Take this into account, else the script
# won't work on such systems
if [ ! -d ${tracing} ]; then
if [ -d /sys/kernel/tracing ]; then
tracing=/sys/kernel/tracing
else
die "ISSUE: neither the /sys/kernel/debug/tracing nor /sys/kernel/tracing dir is available"
fi
fi
if (( debug )); then
echo "tracing dir: ${tracing}"
fi

### check permissions
cd $tracing || die "ERROR: accessing tracing. Root user? Kernel has FTRACE?
debugfs mounted? (mount -t debugfs debugfs /sys/kernel/debug)"
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