1 From ff4d1d7e85be94ef43709cd698f0ec9a12f247d1 Mon Sep 17 00:00:00 2001
2 From: Beniamin Sandu <beniaminsandu@gmail.com>
3 Date: Thu, 13 Aug 2020 16:24:39 +0300
4 Subject: [PATCH 01/10] Kconfig: fix dependency issue when building in-tree
7 When building in-tree, one could disable CONFIG_FTRACE from kernel
8 config which will leave CONFIG_TRACEPOINTS selected by LTTNG modules,
9 but generate a lot of linker errors like below because it leaves out
12 trace.c:(.text+0xd86b): undefined reference to `trace_event_buffer_reserve'
13 ld: trace.c:(.text+0xd8de): undefined reference to `trace_event_buffer_commit'
14 ld: trace.c:(.text+0xd926): undefined reference to `event_triggers_call'
15 ld: trace.c:(.text+0xd942): undefined reference to `trace_event_ignore_this_pid'
16 ld: net/mac80211/trace.o: in function `trace_event_raw_event_drv_tdls_cancel_channel_switch':
18 It appears to be caused by the fact that TRACE_EVENT macros in the Linux
19 kernel depend on the Ftrace ring buffer as soon as CONFIG_TRACEPOINTS is
24 - Get a clone of an upstream stable kernel and use scripts/built-in.sh on it
26 - Configure a standard x86-64 build, enable built-in LTTNG but disable
27 CONFIG_FTRACE from Kernel Hacking-->Tracers using menuconfig
29 - Build will fail at linking stage
31 Upstream-Status: Backport
33 Signed-off-by: Beniamin Sandu <beniaminsandu@gmail.com>
34 Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
37 1 file changed, 1 insertion(+), 1 deletion(-)
39 diff --git a/Kconfig b/Kconfig
40 index acdab73..10eccff 100644
46 tristate "LTTng support"
50 LTTng is an open source tracing framework for Linux.
