linux-kernel - [PATCH v2 2/4] ppc64 ftrace_with

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Message-ID: <20150619140829.GB8824@lst.de>
Date:	Fri, 19 Jun 2015 16:08:29 +0200
From:	Torsten Duwe <duwe@....de>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Michael Ellerman <mpe@...erman.id.au>
Cc:	Jiri Kosina <jkosina@...e.cz>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] ppc64 ftrace_with_regs configuration variables

  * Makefile:
    - globally use -mprofile-kernel in case it's configured.
  * arch/powerpc/Kconfig / kernel/trace/Kconfig:
    - declare that ppc64 HAVE_MPROFILE_KERNEL and
      HAVE_DYNAMIC_FTRACE_WITH_REGS, and use it.

Signed-off-by: Torsten Duwe <duwe@...e.de>
---
 Makefile             |    5 ++++-
 arch/powerpc/Kconfig |    2 ++
 kernel/trace/Kconfig |    5 +++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 3d16bcc..bbd5e87 100644
--- a/Makefile
+++ b/Makefile
@@ -733,7 +733,10 @@ export CC_FLAGS_FTRACE
 ifdef CONFIG_HAVE_FENTRY
 CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
 endif
-KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
+ifdef CONFIG_HAVE_MPROFILE_KERNEL
+CC_USING_MPROFILE_KERNEL	:= $(call cc-option, -mprofile-kernel -DCC_USING_MPROFILE_KERNEL)
+endif
+KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) $(CC_USING_MPROFILE_KERNEL)
 KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
 ifdef CONFIG_DYNAMIC_FTRACE
 	ifdef CONFIG_HAVE_C_RECORDMCOUNT
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 22b0940..566f204 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -94,8 +94,10 @@ config PPC
 	select OF_RESERVED_MEM
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_DYNAMIC_FTRACE
+	select HAVE_DYNAMIC_FTRACE_WITH_REGS
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
+	select HAVE_MPROFILE_KERNEL
 	select SYSCTL_EXCEPTION_TRACE
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select VIRT_TO_BUS if !PPC64
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index a5da09c..dd53f3d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -52,6 +52,11 @@ config HAVE_FENTRY
 	help
 	  Arch supports the gcc options -pg with -mfentry
 
+config HAVE_MPROFILE_KERNEL
+	bool
+	help
+	  Arch supports the gcc options -pg with -mprofile-kernel
+
 config HAVE_C_RECORDMCOUNT
 	bool
 	help
--
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