linux-kernel - [PATCH] perf/core: allow ftrace for functions in kernel/event/core.c

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Date:   Wed, 6 Oct 2021 14:07:32 -0700
From:   Song Liu <songliubraving@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <kernel-team@...com>, <acme@...nel.org>, <peterz@...radead.org>,
        <mingo@...hat.com>, Song Liu <songliubraving@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        KP Singh <kpsingh@...nel.org>
Subject: [PATCH] perf/core: allow ftrace for functions in kernel/event/core.c

It is useful to trace functions in kernel/event/core.c. Allow ftrace for
them by removing $(CC_FLAGS_FTRACE) from Makefile.

---
We had some discussions about this last year [1]. Seems that enabling
ftrace in kernel/events won't really cause fatal recursion in the tests.
Shall we give it another try?

[1] https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2174018.html

Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: KP Singh <kpsingh@...nel.org>
Signed-off-by: Song Liu <songliubraving@...com>
---
 kernel/events/Makefile | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/kernel/events/Makefile b/kernel/events/Makefile
index 3c022e33c1091..8591c180b52b3 100644
--- a/kernel/events/Makefile
+++ b/kernel/events/Makefile
@@ -1,10 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-ifdef CONFIG_FUNCTION_TRACER
-CFLAGS_REMOVE_core.o = $(CC_FLAGS_FTRACE)
-endif
-
 obj-y := core.o ring_buffer.o callchain.o
 
 obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
 obj-$(CONFIG_UPROBES) += uprobes.o
-
-- 
2.30.2