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kernel: add missing symbol

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Enabling KERNEL_FTRACE exposes the HIST_TRIGGERS triggers symbol. Add a
build option for it to fix build failures with KERNEL_FTRACE enabled.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
This commit is contained in:
Stijn Tintel 2021-11-06 20:55:57 +02:00
parent 5720ac8f4c
commit 38106a484c
1 changed files with 13 additions and 0 deletions
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13
config/Config-kernel.in
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@ -349,6 +349,19 @@ config KERNEL_PREEMPT_TRACER
enabled. This option and the irqs-off timing option can be
used together or separately.)
config KERNEL_HIST_TRIGGERS
bool "Histogram triggers"
depends on KERNEL_FTRACE
help
Hist triggers allow one or more arbitrary trace event fields to be
aggregated into hash tables and dumped to stdout by reading a
debugfs/tracefs file. They're useful for gathering quick and dirty
(though precise) summaries of event activity as an initial guide for
further investigation using more advanced tools.
Inter-event tracing of quantities such as latencies is also
supported using hist triggers under this option.
config KERNEL_DEBUG_KERNEL
bool
default n