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

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Date:   Wed, 14 Sep 2016 17:36:54 +0800
From:   "Wangnan (F)" <wangnan0@...wei.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "Arnaldo Carvalho de Melo" <acme@...nel.org>
CC:     <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 2016/9/14 17:28, Naveen N. Rao wrote:
> 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")?

Perhaps we should set all non-exist flag to 0 in each uapi mman.h?

Thank you.

> - 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....
>