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

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Date:   Wed, 14 Sep 2016 10:52:13 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
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

Em Wed, Sep 14, 2016 at 02:58:10PM +0530, Naveen N. Rao escreveu:
> 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:
> > 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")?

Humm, yeah, we have to find a way to make it clear that some flags are
not present in all arches, I'll think about the solution Wang came up
with, i.e. having it defined to zero on arches where it is not
supported, which at first sounds ugly :-\

One thing related to this, but for future work, is to be able to support
doing a ' perf trace record'  on x86_64 and then doing a 'perf trace -i
perf.data' with the resulting file, i.e. cross-platform syscall arg
beautifying, i.e. a cross-arch strace.

Right now we use audit lib to at least map the syscall ids using, IIRC,
the header env stuff, but we need to go to the syscall args as well.
Future work, sure.

And yeah, I'll try and cross-build audit-lib for my powerpc cross build
containers, so that I can catch this bug before applying these patches
and make sure things like this get caught in the future.

- Arnaldo

> - 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....