Messages in this thread | | | Date | Mon, 14 Dec 2015 19:53:53 +0800 | From | "Wangnan (F)" <> | Subject | Re: [PATCH] perf: bpf: Fix build breakage due to libbpf |
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Hi Naveen,
On 2015/12/14 18:50, Naveen N. Rao wrote: > perf build is currently (v4.4-rc5) broken on powerpc: > > bpf.c:28:4: error: #error __NR_bpf not defined. libbpf does not support > your arch. > # error __NR_bpf not defined. libbpf does not support your arch. > ^ > > Fix this by including tools/perf/config/Makefile.arch for the proper > $ARCH macro. While at it, remove redundant LP64 macro definition. > > Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> > --- > tools/lib/bpf/Makefile | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile > index 636e3dd..050e0e8 100644 > --- a/tools/lib/bpf/Makefile > +++ b/tools/lib/bpf/Makefile > @@ -31,7 +31,8 @@ INSTALL = install > DESTDIR ?= > DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))' > > -LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1) > +include $(srctree)/tools/perf/config/Makefile.arch > + > ifeq ($(LP64), 1) > libdir_relative = lib64 > else
Are you doing cross compiling? In this case you should provide an 'ARCH' to make through cmdline. For example, this is how yocto help me build perf on aarch64:
$ make -C /patch/to/kernel/tools/perf O=/path/to/output \ CROSS_COMPILE=aarch64-oe-linux- ARCH=arm64 \ CC=aarch64-oe-linux-gcc --sysroot=... AR=aarch64-oe-linux-ar ...
If you include Makefile.arch, I think you are seeking for a 'uname -m' result, then you are not doing cross compiling, right? In this case what you need is providing a __NR_bpf entry for your platform, because in some cases that value is overrided because we have
$ find ./tools/ -name "unistd*" ./tools/perf/util/include/asm/unistd_64.h ./tools/perf/util/include/asm/unistd_32.h
You can find the reason of these two files through: eae7a755ee81129370c8f555b0d5672e6673735d
I posted a patch by replying this mail. I think you can find it through [1] soon. I don't have PPC environment to check it. Could you please help me check this patch in your environment?
[1] http://lkml.kernel.org/g/1450092932-123588-1-git-send-email-wangnan0@huawei.com
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