Commit 7bf99fb6 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Linus Torvalds
Browse files

gcov: enable GCOV_PROFILE_ALL for x86_64 



Enable gcov profiling of the entire kernel on x86_64. Required changes
include disabling profiling for:

* arch/kernel/acpi/realmode and arch/kernel/boot/compressed:
  not linked to main kernel
* arch/vdso, arch/kernel/vsyscall_64 and arch/kernel/hpet:
  profiling causes segfaults during boot (incompatible context)

Signed-off-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Li Wei <W.Li@Sun.COM>
Cc: Michael Ellerman <michaele@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Heiko Carstens <heicars2@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <mschwid2@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2521f2c2

arch/x86/boot/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ 
		   $(call cc-option, -mpreferred-stack-boundary=2)

KBUILD_CFLAGS	+= $(call cc-option, -m32)

KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__

GCOV_PROFILE := n



$(obj)/bzImage: asflags-y  := $(SVGA_MODE)

arch/x86/boot/compressed/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ KBUILD_CFLAGS += $(call cc-option,-ffreestanding) 
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)



KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__

GCOV_PROFILE := n



LDFLAGS := -m elf_$(UTS_MACHINE)

LDFLAGS_vmlinux := -T

arch/x86/kernel/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,8 @@ CFLAGS_vsyscall_64.o := $(PROFILING) -g0 $(nostackp) 
CFLAGS_hpet.o		:= $(nostackp)

CFLAGS_tsc.o		:= $(nostackp)

CFLAGS_paravirt.o	:= $(nostackp)

GCOV_PROFILE_vsyscall_64.o	:= n

GCOV_PROFILE_hpet.o		:= n



obj-y			:= process_$(BITS).o signal.o entry_$(BITS).o

obj-y			+= traps.o irq.o irq_$(BITS).o dumpstack_$(BITS).o

arch/x86/kernel/acpi/realmode/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D_WAKEUP -D__KERNEL__ \ 
		   $(call cc-option, -mpreferred-stack-boundary=2)

KBUILD_CFLAGS	+= $(call cc-option, -m32)

KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__

GCOV_PROFILE := n



WAKEUP_OBJS = $(addprefix $(obj)/,$(wakeup-y))

arch/x86/vdso/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ quiet_cmd_vdso = VDSO $@ 
		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)



VDSO_LDFLAGS = -fPIC -shared $(call ld-option, -Wl$(comma)--hash-style=sysv)

GCOV_PROFILE := n



#

# Install the unstripped copy of vdso*.so listed in $(vdso-install-y).

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