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Date:   Mon, 5 Nov 2018 16:13:56 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Ingo Molnar <mingo@kernel.org>,
        Clark Williams <williams@redhat.com>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH 19/28] perf beauty: Wire up the mmap flags table
 generator to the Makefile
Message-ID: <20181105191356.GF7077@kernel.org>
References: <20181031164508.4784-1-acme@kernel.org>
 <20181031164508.4784-20-acme@kernel.org>
 <20181105154433.GA11115@roeck-us.net>
 <20181105171140.GD11147@kernel.org>
 <20181105184612.GD7077@kernel.org>
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Em Mon, Nov 05, 2018 at 03:46:12PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Nov 05, 2018 at 02:11:40PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Nov 05, 2018 at 07:44:33AM -0800, Guenter Roeck escreveu:
> > > On Wed, Oct 31, 2018 at 01:44:59PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> 
> > > > Now when we run 'make -C tools/perf O=/tmp/build/perf' we end up with:
> 
> > > >   $ cat /tmp/build/perf/trace/beauty/generated/mmap_flags_array.c
> > > >   static const char *mmap_flags[] = {
> > > > 	[ilog2(0x40) + 1] = "32BIT",
> <SNIP>
> > > > +include ../scripts/Makefile.arch
> 
> > > >  # The default target of this Makefile is...
> > > >  all:
> > > > @@ -385,6 +386,8 @@ export INSTALL SHELL_PATH
> > > >  SHELL = $(SHELL_PATH)
> 
> > > >  linux_uapi_dir := $(srctree)/tools/include/uapi/linux
> > > > +asm_generic_uapi_dir := $(srctree)/tools/include/uapi/asm-generic
> > > > +arch_asm_uapi_dir := $(srctree)/tools/arch/$(ARCH)/include/uapi/asm/
> 
> > > This doesn't work for me. With v4.20-rc1:
> 
> > > $ make ARCH=x86_64 defconfig
> > > *** Default configuration is based on 'x86_64_defconfig'
>  
> > I'll fix this, its the ARCH that needs to be normalized to x86 before
> > building the path...
> 
> Can you try with the following patch?

I did the tests and it seems to work, its the same method used by the
kernel sources, so I have this in place now:

commit e2c39f36c354a06c6e9d32d4fdf8660b41803d82
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
Date:   Mon Nov 5 15:46:51 2018 -0300

    perf beauty: Use SRCARCH, ARCH=x86_64 must map to "x86" to find the headers
    
    Guenter reported that using ARCH=x86_64 to build perf has regressed:
    
      $ make -C tools/perf O=/tmp/build/perf ARCH=x86_64
      make: Entering directory '/home/acme/git/perf/tools/perf'
        BUILD:   Doing 'make -j4' parallel build
        HOSTCC   /tmp/build/perf/fixdep.o
        HOSTLD   /tmp/build/perf/fixdep-in.o
        LINK     /tmp/build/perf/fixdep
    
      Auto-detecting system features:
      ...                         dwarf: [ on  ]
      <SNIP>
      ...                           bpf: [ on  ]
    
        GEN      /tmp/build/perf/common-cmds.h
      make[2]: *** No rule to make target '/home/acme/git/perf/tools/arch/x86_64/include/uapi/asm//mman.h', needed by '/tmp/build/perf/trace/beauty/generated/mmap_flags_array.c'.  Stop.
      make[2]: *** Waiting for unfinished jobs....
        PERF_VERSION = 4.19.gf6c23e3
      make[1]: *** [Makefile.perf:207: sub-make] Error 2
      make: *** [Makefile:70: all] Error 2
      make: Leaving directory '/home/acme/git/perf/tools/perf'
      $
    
    This is because we must use $(SRCARCH) where we were using $(ARCH), so
    that, just like the top level Makefile, we get this done:
    
      # Additional ARCH settings for x86
      ifeq ($(ARCH),i386)
              SRCARCH := x86
      endif
      ifeq ($(ARCH),x86_64)
              SRCARCH := x86
      endif
    
    Which is done in tools/scripts/Makefile.arch, so switch to use
    $(SRCARCH).
    
    Reported-by: Guenter Roeck <linux@roeck-us.net>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Clark Williams <williams@redhat.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Fixes: fbd7458db757 ("perf beauty: Wire up the mmap flags table generator to the Makefile")
    Link: https://lkml.kernel.org/r/20181105184612.GD7077@kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 3ccb4f0bf088..d95655489f7e 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -387,7 +387,7 @@ SHELL = $(SHELL_PATH)
 
 linux_uapi_dir := $(srctree)/tools/include/uapi/linux
 asm_generic_uapi_dir := $(srctree)/tools/include/uapi/asm-generic
-arch_asm_uapi_dir := $(srctree)/tools/arch/$(ARCH)/include/uapi/asm/
+arch_asm_uapi_dir := $(srctree)/tools/arch/$(SRCARCH)/include/uapi/asm/
 
 beauty_outdir := $(OUTPUT)trace/beauty/generated
 beauty_ioctl_outdir := $(beauty_outdir)/ioctl