linux-kernel - Re: [tools headers UAPI] e2bcbd7769: kernel-selftests.ir.make

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Date:   Fri, 28 Jan 2022 17:38:43 +0000
From:   Sean Young <sean@...s.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        kernel test robot <oliver.sang@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        lkp@...ts.01.org, kbuild test robot <lkp@...el.com>
Subject: Re: [tools headers UAPI] e2bcbd7769: kernel-selftests.ir.make_fail

On Fri, Jan 28, 2022 at 10:27:52AM -0700, Shuah Khan wrote:
> On 1/28/22 9:49 AM, Alexei Starovoitov wrote:
> > On Fri, Jan 28, 2022 at 1:32 AM Sean Young <sean@...s.org> wrote:
> > > 
> 
> > > > ir_loopback.c: In function ‘main’:
> > > > ir_loopback.c:147:20: error: ‘RC_PROTO_RCMM32’ undeclared (first use in this function); did you mean ‘RC_PROTO_RC6_MCE’?
> > > >      if (rc_proto == RC_PROTO_RCMM32 &&
> > > >                      ^~~~~~~~~~~~~~~
> > > >                      RC_PROTO_RC6_MCE
> > > 
> > > So this commit removes the copy of lirc.h from tools/include/uapi/linux/lirc.h,
> > > so now the test uses /usr/include/linux/lirc.h. It appears that this file
> > > does not have RC_PROTO_RCMM32 defined on this system, which means it is a
> > > kernel header from v5.1 or earlier (this was added in commit
> > > 721074b03411327e7bf41555d4cc7c18f49313f7).
> > > 
> > > It looks like this machine is redhat 8.3, which ships with kernel 4.18.
> > > 
> > > I guess my change was far too optimistic; I had no ideal enterprise kernels
> > > were so ancient.
> > > 
> > > We should probably drop e2bcbd7769ee8f05e1b3d10848aace98973844e4. Sorry about
> > > the turbulence.
> > 
> > I'd rather avoid reverting.
> > Just add ifdef or something to shut up the error on old distros.
> > 
> 
> Sean,
> 
> Let's not add release checks.
> 
> Since RC_PROTO_RCMM32 is the only one missing, perhaps you could define
> just that one in ir_loopback.c with a comment that it can be removed.
> 
> ifndef RC_PROTO_RCMM32 ---

Hi Shuah,

I was thinking along the same lines, however RC_PROTO_RCMM32 is an enum
value so a pre-processor #ifdef is not going to work. At the moment I haven't
had any bright ideas other than doing a `#define RC_PROTO_RCMM32 26` at the
top of the file.

Open to suggestions.

Thanks,

Sean