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Message-ID: <483BC73A.7090700@de.ibm.com> Date: Tue, 27 May 2008 10:32:58 +0200 From: Peter Oberparleiter <peter.oberparleiter@...ibm.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: Peter Oberparleiter <oberparleiter@...glemail.com>, linux-kernel@...r.kernel.org, ltp-coverage@...ts.sourceforge.net, Sam Ravnborg <sam@...nborg.org> Subject: Re: [PATCH 0/7] gcov kernel support Andrew Morton wrote: > On Mon, 19 May 2008 10:42:54 +0200 Peter Oberparleiter <peter.oberparleiter@...ibm.com> wrote: > >> This is version #2 of the gcov kernel support patch set > > powerpc blew up: > > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown-linux-gnu/bin/ld: skipping incompatible /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/./libgcov.a when searching for -lgcov > /opt/crosstool/gcc-4.1.0-glibc-2.3.6/powerpc64-unknown-linux-gnu/lib/gcc/powerpc64-unknown-linux-gnu/4.1.0/../../../../powerpc64-unknown-linux-gnu/bin/ld: cannot find -lgcov > collect2: ld returned 1 exit status > make[2]: *** [arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 1 > make[1]: *** [arch/powerpc/kernel/vdso32] Error 2 This looks like a secondary linking process. It's best to exclude the whole directory from GCOV profiling (which should ony work for C files anyway). Below is an update for patch #7 of the gcov series that includes the corresponding changes. --- [PATCH 7/7] gcov: architecture specific compile flag adjustments From: Peter Oberparleiter <peter.oberparleiter@...ibm.com> Exclude code from profiling which is not linked to the main kernel or which is running in a context not compatible with the assumptions made by gcc's profiling code. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@...ibm.com> --- arch/arm/boot/compressed/Makefile | 1 + arch/powerpc/kernel/vdso32/Makefile | 1 + arch/powerpc/kernel/vdso64/Makefile | 1 + arch/ppc/boot/Makefile | 1 + arch/ppc/boot/common/Makefile | 1 + arch/ppc/boot/simple/Makefile | 1 + arch/x86/boot/Makefile | 1 + arch/x86/boot/compressed/Makefile | 1 + arch/x86/kernel/acpi/realmode/Makefile | 1 + 9 files changed, 9 insertions(+) Index: linux-2.6.26-rc3/arch/arm/boot/compressed/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/arm/boot/compressed/Makefile +++ linux-2.6.26-rc3/arch/arm/boot/compressed/Makefile @@ -7,6 +7,7 @@ HEAD = head.o OBJS = misc.o FONTC = $(srctree)/drivers/video/console/font_acorn_8x8.c +GCOV := n # # Architecture dependencies Index: linux-2.6.26-rc3/arch/x86/boot/compressed/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/x86/boot/compressed/Makefile +++ linux-2.6.26-rc3/arch/x86/boot/compressed/Makefile @@ -12,6 +12,7 @@ cflags-$(CONFIG_X86_64) := -mcmodel=smal KBUILD_CFLAGS += $(cflags-y) KBUILD_CFLAGS += $(call cc-option,-ffreestanding) KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) +GCOV := n KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ Index: linux-2.6.26-rc3/arch/ppc/boot/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/ppc/boot/Makefile +++ linux-2.6.26-rc3/arch/ppc/boot/Makefile @@ -16,6 +16,7 @@ # KBUILD_CFLAGS used when building rest of boot (takes effect recursively) KBUILD_CFLAGS += -fno-builtin -D__BOOTER__ -Iarch/$(ARCH)/boot/include HOSTCFLAGS += -Iarch/$(ARCH)/boot/include +GCOV := n BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd Index: linux-2.6.26-rc3/arch/ppc/boot/common/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/ppc/boot/common/Makefile +++ linux-2.6.26-rc3/arch/ppc/boot/common/Makefile @@ -5,6 +5,7 @@ # Tom Rini January 2001 # +GCOV := n lib-y := string.o util.o misc-common.o \ serial_stub.o bootinfo.o lib-$(CONFIG_SERIAL_8250_CONSOLE) += ns16550.o Index: linux-2.6.26-rc3/arch/ppc/boot/simple/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/ppc/boot/simple/Makefile +++ linux-2.6.26-rc3/arch/ppc/boot/simple/Makefile @@ -21,6 +21,7 @@ # XXX_memory.o file for this to work, as well as editing the # misc-$(CONFIG_MACHINE) variable. +GCOV := n boot := arch/ppc/boot common := $(boot)/common utils := $(boot)/utils Index: linux-2.6.26-rc3/arch/x86/boot/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/x86/boot/Makefile +++ linux-2.6.26-rc3/arch/x86/boot/Makefile @@ -71,6 +71,7 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os $(call cc-option, -mpreferred-stack-boundary=2) KBUILD_CFLAGS += $(call cc-option,-m32) KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ +GCOV := n $(obj)/zImage: IMAGE_OFFSET := 0x1000 $(obj)/zImage: asflags-y := $(SVGA_MODE) $(RAMDISK) Index: linux-2.6.26-rc3/arch/x86/kernel/acpi/realmode/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/x86/kernel/acpi/realmode/Makefile +++ linux-2.6.26-rc3/arch/x86/kernel/acpi/realmode/Makefile @@ -42,6 +42,7 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os $(call cc-option, -mpreferred-stack-boundary=2) KBUILD_CFLAGS += $(call cc-option, -m32) KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ +GCOV := n WAKEUP_OBJS = $(addprefix $(obj)/,$(wakeup-y)) Index: linux-2.6.26-rc3/arch/powerpc/kernel/vdso32/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/powerpc/kernel/vdso32/Makefile +++ linux-2.6.26-rc3/arch/powerpc/kernel/vdso32/Makefile @@ -17,6 +17,7 @@ EXTRA_CFLAGS := -shared -fno-common -fno EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso32.so.1 \ $(call ld-option, -Wl$(comma)--hash-style=sysv) EXTRA_AFLAGS := -D__VDSO32__ -s +GCOV := n obj-y += vdso32_wrapper.o extra-y += vdso32.lds Index: linux-2.6.26-rc3/arch/powerpc/kernel/vdso64/Makefile =================================================================== --- linux-2.6.26-rc3.orig/arch/powerpc/kernel/vdso64/Makefile +++ linux-2.6.26-rc3/arch/powerpc/kernel/vdso64/Makefile @@ -11,6 +11,7 @@ EXTRA_CFLAGS := -shared -fno-common -fno EXTRA_CFLAGS += -nostdlib -Wl,-soname=linux-vdso64.so.1 \ $(call ld-option, -Wl$(comma)--hash-style=sysv) EXTRA_AFLAGS := -D__VDSO64__ -s +GCOV := n obj-y += vdso64_wrapper.o extra-y += vdso64.lds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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