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Diffstat (limited to 'meta/recipes-kernel/lttng/lttng-modules/0001-Kconfig-fix-dependency-issue-when-building-in-tree-w.patch')
| -rw-r--r-- | meta/recipes-kernel/lttng/lttng-modules/0001-Kconfig-fix-dependency-issue-when-building-in-tree-w.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/meta/recipes-kernel/lttng/lttng-modules/0001-Kconfig-fix-dependency-issue-when-building-in-tree-w.patch b/meta/recipes-kernel/lttng/lttng-modules/0001-Kconfig-fix-dependency-issue-when-building-in-tree-w.patch new file mode 100644 index 0000000000..ae8bec45de --- /dev/null +++ b/meta/recipes-kernel/lttng/lttng-modules/0001-Kconfig-fix-dependency-issue-when-building-in-tree-w.patch @@ -0,0 +1,54 @@ +From ff4d1d7e85be94ef43709cd698f0ec9a12f247d1 Mon Sep 17 00:00:00 2001 +From: Beniamin Sandu <beniaminsandu@gmail.com> +Date: Thu, 13 Aug 2020 16:24:39 +0300 +Subject: [PATCH 01/10] Kconfig: fix dependency issue when building in-tree + without CONFIG_FTRACE + +When building in-tree, one could disable CONFIG_FTRACE from kernel +config which will leave CONFIG_TRACEPOINTS selected by LTTNG modules, +but generate a lot of linker errors like below because it leaves out +other stuff, e.g.: + +trace.c:(.text+0xd86b): undefined reference to `trace_event_buffer_reserve' +ld: trace.c:(.text+0xd8de): undefined reference to `trace_event_buffer_commit' +ld: trace.c:(.text+0xd926): undefined reference to `event_triggers_call' +ld: trace.c:(.text+0xd942): undefined reference to `trace_event_ignore_this_pid' +ld: net/mac80211/trace.o: in function `trace_event_raw_event_drv_tdls_cancel_channel_switch': + +It appears to be caused by the fact that TRACE_EVENT macros in the Linux +kernel depend on the Ftrace ring buffer as soon as CONFIG_TRACEPOINTS is +enabled. + +Steps to reproduce: + +- Get a clone of an upstream stable kernel and use scripts/built-in.sh on it + +- Configure a standard x86-64 build, enable built-in LTTNG but disable + CONFIG_FTRACE from Kernel Hacking-->Tracers using menuconfig + +- Build will fail at linking stage + +Upstream-Status: Backport + +Signed-off-by: Beniamin Sandu <beniaminsandu@gmail.com> +Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> +--- + Kconfig | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/Kconfig b/Kconfig +index acdab73..10eccff 100644 +--- a/Kconfig ++++ b/Kconfig +@@ -2,7 +2,7 @@ + + config LTTNG + tristate "LTTng support" +- select TRACEPOINTS ++ select TRACING + help + LTTng is an open source tracing framework for Linux. + +-- +2.19.1 + |