linux-kernel - [PATCH 3/4] samples: add HAVE_SAMPLE_FTRACE

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Date:   Tue, 12 Oct 2021 15:38:01 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH 3/4] samples: add HAVE_SAMPLE_FTRACE_DIRECT config option

Add HAVE_SAMPLE_FTRACE_DIRECT config option which can be selected by
architectures which have support for ftrace direct call samples.

Acked-by: Ilya Leoshkevich <iii@...ux.ibm.com>
Reviewed-by: Sven Schnelle <svens@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/x86/Kconfig | 1 +
 samples/Kconfig  | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a52e81cb256e..917391003c7a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -189,6 +189,7 @@ config X86
 	select HAVE_DYNAMIC_FTRACE_WITH_REGS
 	select HAVE_DYNAMIC_FTRACE_WITH_ARGS	if X86_64
 	select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
+	select HAVE_SAMPLE_FTRACE_DIRECT	if X86_64
 	select HAVE_EBPF_JIT
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	select HAVE_EISA
diff --git a/samples/Kconfig b/samples/Kconfig
index 8cbd6490823f..0823b97d8546 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -26,7 +26,7 @@ config SAMPLE_TRACE_PRINTK
 config SAMPLE_FTRACE_DIRECT
 	tristate "Build register_ftrace_direct() example"
 	depends on DYNAMIC_FTRACE_WITH_DIRECT_CALLS && m
-	depends on X86_64 # has x86_64 inlined asm
+	depends on HAVE_SAMPLE_FTRACE_DIRECT
 	help
 	  This builds an ftrace direct function example
 	  that hooks to wake_up_process and prints the parameters.
@@ -226,3 +226,6 @@ config SAMPLE_WATCH_QUEUE
 source "samples/rust/Kconfig"
 
 endif # SAMPLES
+
+config HAVE_SAMPLE_FTRACE_DIRECT
+	bool
-- 
2.25.1