linux-kernel - Re: [PATCH] tools/io_uring: fix compile breakage

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Message-ID: <fa89c176-df34-8e96-f273-4dd52882a070@kernel.dk>
Date:   Mon, 14 Sep 2020 19:34:15 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Douglas Gilbert <dgilbert@...erlog.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-block@...r.kernel.org
Subject: Re: [PATCH] tools/io_uring: fix compile breakage

On 9/14/20 3:36 PM, Douglas Gilbert wrote:
> It would seem none of the kernel continuous integration does this:
>     $ cd tools/io_uring
>     $ make
> 
> Otherwise it may have noticed:
>    cc -Wall -Wextra -g -D_GNU_SOURCE   -c -o io_uring-bench.o
> 	 io_uring-bench.c
> io_uring-bench.c:133:12: error: static declaration of ‘gettid’
> 	 follows non-static declaration
>   133 | static int gettid(void)
>       |            ^~~~~~
> In file included from /usr/include/unistd.h:1170,
>                  from io_uring-bench.c:27:
> /usr/include/x86_64-linux-gnu/bits/unistd_ext.h:34:16: note:
> 	 previous declaration of ‘gettid’ was here
>    34 | extern __pid_t gettid (void) __THROW;
>       |                ^~~~~~
> make: *** [<builtin>: io_uring-bench.o] Error 1
> 
> The problem on Ubuntu 20.04 (with lk 5.9.0-rc5) is that unistd.h
> already defines gettid(). So prefix the local definition with
> "lk_".

Thanks Doug - I haven't really been maintaining the examples in
the kernel, only in liburing. I'll apply this one, and hopefully
sync them up for 5.10 in general.


-- 
Jens Axboe