powerpc: Enable GCOV

Make it possible to enable GCOV code coverage measurement on powerpc.

Lightly tested on 64-bit, seems to work as expected.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 035946f9d5fb3bf2b237ba9a62b7c7edbda2dc83..720e8c3b8e94f5d9ff90c915bfd713c7276776f9 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -115,6 +115,13 @@ ifneq ($(CONFIG_XMON)$(CONFIG_KEXEC),)
 obj-y                          += ppc_save_regs.o
 endif
 
+# Disable GCOV in odd or sensitive code
+GCOV_PROFILE_prom_init.o := n
+GCOV_PROFILE_ftrace.o := n
+GCOV_PROFILE_machine_kexec_64.o := n
+GCOV_PROFILE_machine_kexec_32.o := n
+GCOV_PROFILE_kprobes.o := n
+
 extra-$(CONFIG_PPC_FPU)                += fpu.o
 extra-$(CONFIG_ALTIVEC)                += vector.o
 extra-$(CONFIG_PPC64)          += entry_64.o

diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
index c3d57bd01a88ab2157b5ae92ca9fd34561d9008f..b54b81688132bab49851646f7b3697ee65bae5c0 100644 (file)
--- a/arch/powerpc/kernel/vdso32/Makefile
+++ b/arch/powerpc/kernel/vdso32/Makefile
@@ -12,6 +12,7 @@ endif
 targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
 
+GCOV_PROFILE := n
 
 EXTRA_CFLAGS := -shared -fno-common -fno-builtin
 EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso32.so.1 \

diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile
index fa7f1b8f3e5024c2ed705837d728694ff56f15b7..dd0c8e9367751eb2cd3bc55795a819dbde4bc085 100644 (file)
--- a/arch/powerpc/kernel/vdso64/Makefile
+++ b/arch/powerpc/kernel/vdso64/Makefile
@@ -7,6 +7,8 @@ obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o
 targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
 
+GCOV_PROFILE := n
+
 EXTRA_CFLAGS := -shared -fno-common -fno-builtin
 EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
                $(call ld-option, -Wl$(comma)--hash-style=sysv)

diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
index 85ab97ab840a19172662b712f1f345850918a090..faa81b6a66126531c87f94897f33d2affc7c43f3 100644 (file)
--- a/arch/powerpc/xmon/Makefile
+++ b/arch/powerpc/xmon/Makefile
@@ -2,6 +2,8 @@
 
 subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
 
+GCOV_PROFILE := n
+
 ifdef CONFIG_PPC64
 EXTRA_CFLAGS += -mno-minimal-toc
 endif

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 22e9dcfaa3d36b3a5d2325d0049a314ff2c7d07d..654efd09f6a97cb6497d18be2d303364539ac7a9 100644 (file)
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -34,7 +34,7 @@ config GCOV_KERNEL
 config GCOV_PROFILE_ALL
        bool "Profile entire Kernel"
        depends on GCOV_KERNEL
-       depends on S390 || X86
+       depends on S390 || X86 || (PPC && EXPERIMENTAL)
        default n
        ---help---
        This options activates profiling for the entire kernel.