Re: [PATCH 3/4] samples/bpf: Simplify building BPF samples

2016-03-31 Thread Alexei Starovoitov 

On 3/31/16 11:51 AM, Naveen N. Rao wrote:

On 2016/03/31 10:49AM, Alexei Starovoitov wrote:

On 3/31/16 4:25 AM, Naveen N. Rao wrote:

Make BPF samples build depend on CONFIG_SAMPLE_BPF. We still don't add a
Kconfig option since that will add a dependency on llvm for allyesconfig
builds which may not be desirable.

Those who need to build the BPF samples can now just do:

make CONFIG_SAMPLE_BPF=y

or:

export CONFIG_SAMPLE_BPF=y
make


I don't like this 'simplification'.
make samples/bpf/
is much easier to type than capital letters.


This started out as a patch to have the BPF samples built with a Kconfig
option. As stated in the commit description, I realised that it won't
work for allyesconfig builds. However, the reason I retained this patch
is since it gets us one step closer to building the samples as part of
the kernel build.

The 'simplification' is since I can now have the export in my .bashrc
and the kernel build will now build the BPF samples too without
requiring an additional 'make samples/bpf/' step.

I agree this is subjective, so I am ok if this isn't taken in.


If you can change it that 'make samples/bpf/' still works then it would
be fine. As it is it breaks our testing setup.

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Re: [PATCH 3/4] samples/bpf: Simplify building BPF samples

2016-03-31 Thread Alexei Starovoitov 

On 3/31/16 4:25 AM, Naveen N. Rao wrote:

Make BPF samples build depend on CONFIG_SAMPLE_BPF. We still don't add a
Kconfig option since that will add a dependency on llvm for allyesconfig
builds which may not be desirable.

Those who need to build the BPF samples can now just do:

make CONFIG_SAMPLE_BPF=y

or:

export CONFIG_SAMPLE_BPF=y
make


I don't like this 'simplification'.
make samples/bpf/
is much easier to type than capital letters.


diff --git a/samples/Makefile b/samples/Makefile
index 48001d7..3c77fc8 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -2,4 +2,4 @@

  obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ trace_events/ livepatch/ \
   hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
-  configfs/
+  configfs/ bpf/
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 88bc5a0..bc5b675 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -2,23 +2,23 @@
  obj- := dummy.o

  # List of programs to build
-hostprogs-y := test_verifier test_maps
-hostprogs-y += sock_example
-hostprogs-y += fds_example
-hostprogs-y += sockex1
-hostprogs-y += sockex2
-hostprogs-y += sockex3
-hostprogs-y += tracex1
-hostprogs-y += tracex2
-hostprogs-y += tracex3
-hostprogs-y += tracex4
-hostprogs-y += tracex5
-hostprogs-y += tracex6
-hostprogs-y += trace_output
-hostprogs-y += lathist
-hostprogs-y += offwaketime
-hostprogs-y += spintest
-hostprogs-y += map_perf_test
+hostprogs-$(CONFIG_SAMPLE_BPF) := test_verifier test_maps
+hostprogs-$(CONFIG_SAMPLE_BPF) += sock_example
+hostprogs-$(CONFIG_SAMPLE_BPF) += fds_example
+hostprogs-$(CONFIG_SAMPLE_BPF) += sockex1
+hostprogs-$(CONFIG_SAMPLE_BPF) += sockex2
+hostprogs-$(CONFIG_SAMPLE_BPF) += sockex3
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex1
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex2
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex3
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex4
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex5
+hostprogs-$(CONFIG_SAMPLE_BPF) += tracex6
+hostprogs-$(CONFIG_SAMPLE_BPF) += trace_output
+hostprogs-$(CONFIG_SAMPLE_BPF) += lathist
+hostprogs-$(CONFIG_SAMPLE_BPF) += offwaketime
+hostprogs-$(CONFIG_SAMPLE_BPF) += spintest
+hostprogs-$(CONFIG_SAMPLE_BPF) += map_perf_test

  test_verifier-objs := test_verifier.o libbpf.o
  test_maps-objs := test_maps.o libbpf.o
@@ -39,8 +39,8 @@ offwaketime-objs := bpf_load.o libbpf.o offwaketime_user.o
  spintest-objs := bpf_load.o libbpf.o spintest_user.o
  map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o

-# Tell kbuild to always build the programs
-always := $(hostprogs-y)
+ifdef CONFIG_SAMPLE_BPF
+always := $(hostprogs-$(CONFIG_SAMPLE_BPF))
  always += sockex1_kern.o
  always += sockex2_kern.o
  always += sockex3_kern.o
@@ -56,6 +56,7 @@ always += lathist_kern.o
  always += offwaketime_kern.o
  always += spintest_kern.o
  always += map_perf_test_kern.o
+endif

  HOSTCFLAGS += -I$(objtree)/usr/include




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Re: [PATCH 3/4] samples/bpf: Simplify building BPF samples

2016-03-31 Thread Naveen N. Rao 
On 2016/03/31 10:49AM, Alexei Starovoitov wrote:
> On 3/31/16 4:25 AM, Naveen N. Rao wrote:
> >Make BPF samples build depend on CONFIG_SAMPLE_BPF. We still don't add a
> >Kconfig option since that will add a dependency on llvm for allyesconfig
> >builds which may not be desirable.
> >
> >Those who need to build the BPF samples can now just do:
> >
> >make CONFIG_SAMPLE_BPF=y
> >
> >or:
> >
> >export CONFIG_SAMPLE_BPF=y
> >make
> 
> I don't like this 'simplification'.
> make samples/bpf/
> is much easier to type than capital letters.

This started out as a patch to have the BPF samples built with a Kconfig 
option. As stated in the commit description, I realised that it won't 
work for allyesconfig builds. However, the reason I retained this patch 
is since it gets us one step closer to building the samples as part of 
the kernel build.

The 'simplification' is since I can now have the export in my .bashrc 
and the kernel build will now build the BPF samples too without 
requiring an additional 'make samples/bpf/' step.

I agree this is subjective, so I am ok if this isn't taken in.


- Naveen

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