linux-kernel - Re: [PATCH 1/3] tools include: Add uapi mman.h for each architecture

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Date:   Wed, 14 Sep 2016 14:58:10 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Wang Nan <wangnan0@...wei.com>, linux-kernel@...r.kernel.org,
        lizefan@...wei.com, pi3orama@....com
Subject: Re: [PATCH 1/3] tools include: Add uapi mman.h for each architecture

On 2016/09/12 06:15PM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Sep 12, 2016 at 04:07:42PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Sep 12, 2016 at 12:54:29PM +0000, Wang Nan escreveu:
> > > Some mmap related macros have different values for different
> > > architectures. This patch introduces uapi mman.h for each
> > > architectures.
> > > 
> > > Three headers are cloned from kernel include to tools/include:
> > > 
> > >  tools/include/uapi/asm-generic/mman-common.h
> > >  tools/include/uapi/asm-generic/mman.h
> > >  tools/include/uapi/linux/mman.h
> > 
> > Cool, the above was done as copies, why not the rest? IIRC you mentioned
> > some reasoning behind that decision, but we need it spelled out here.
> > 
> > For instance, I went on and look at arch/xtensa/include/uapi/asm/mman.h,
> > and couldn't find why we shouldn't copy it just like the three files
> > above.
> > 
> > I'm looking now at why the build breaks in so many systems, first hunch
> > is that bits/ part (the ones without the failure details probably have
> > the same errors), alpine uses musl libc, but some that broke are glibc
> > based.
> 
> So, please take a look at my perf/core branch, I applied 1/3 and 3/3,
> but took a different path for 2/3, now it builds for all systems I have
> containers for:

This still fails for me on ppc64. Perhaps we should guard 
P_MMAP_FLAG(32BIT) and potentially others with a #ifdef, which was 
earlier reverted by commit 256763b0 ("perf trace beauty mmap: Add more 
conditional defines")?

- Naveen

---
In file included from builtin-trace.c:560:0:
trace/beauty/mmap.c: In function ‘syscall_arg__scnprintf_mmap_flags’:
trace/beauty/mmap.c:38:14: error: ‘MAP_32BIT’ undeclared (first use in this function)
  if (flags & MAP_##n) { \
              ^
trace/beauty/mmap.c:45:2: note: in expansion of macro ‘P_MMAP_FLAG’
  P_MMAP_FLAG(32BIT);
  ^
trace/beauty/mmap.c:38:14: note: each undeclared identifier is reported only once for each function it appears in
  if (flags & MAP_##n) { \
              ^
trace/beauty/mmap.c:45:2: note: in expansion of macro ‘P_MMAP_FLAG’
  P_MMAP_FLAG(32BIT);
  ^
  CC       bench/mem-functions.o
mv: cannot stat ‘./.builtin-trace.o.tmp’: No such file or directory
make[2]: *** [builtin-trace.o] Error 1
make[2]: *** Waiting for unfinished jobs....