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Date:   Sat, 28 Apr 2018 07:00:26 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Teck Choon Giam <giamteckchoon@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>, acme@kernel.org,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@redhat.com>
Subject: Re: kernel-4.9.94 compile error: 'KMOD_DECOMP_LEN' undeclared
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On Fri, Apr 27, 2018 at 10:28:27AM -0700, Randy Dunlap wrote:
> [adding some Cc:]
> 
> On 04/14/2018 02:41 AM, Teck Choon Giam wrote:
> > Hi,
> > 
> > Compile linux-4.9.94 will have error related to KMOD_DECOMP_LEN
> > undeclared.  Searching string related to KMOD_DECOMP_LEN in
> > linux-4.9.94 and linux-4.15.17 sources as below:
> > 
> > <mock-chroot>sh-4.2# grep -r KMOD_DECOMP_LEN ./linux-4.15.17
> > ./linux-4.15.17/tools/perf/tests/code-reading.c: char
> > decomp_name[KMOD_DECOMP_LEN];
> > ./linux-4.15.17/tools/perf/util/dso.h:#define KMOD_DECOMP_LEN
> > sizeof(KMOD_DECOMP_NAME)
> > ./linux-4.15.17/tools/perf/util/annotate.c: char tmp[KMOD_DECOMP_LEN];
> > ./linux-4.15.17/tools/perf/util/dso.c: char newpath[KMOD_DECOMP_LEN];
> > sh-4.2# grep -r KMOD_DECOMP_LEN ./linux-4.9.94
> > ./linux-4.9.94/tools/perf/tests/code-reading.c: char
> > decomp_name[KMOD_DECOMP_LEN];
> > ./linux-4.9.94/tools/perf/util/dso.c: char newpath[KMOD_DECOMP_LEN];
> > 
> > So I guess for linux-4.9.94 has not define KMOD_DECOMP_LEN in
> > tools/perf/util/dso.h?
> 
> 
> 4.9.9[456] lack:
> #define KMOD_DECOMP_NAME  "/tmp/perf-kmod-XXXXXX"
> #define KMOD_DECOMP_LEN   sizeof(KMOD_DECOMP_NAME)
> 
> 
> However, the commit that added those macros does not apply cleanly to 4.9.96.
> 
> commit 42b3fa670825983fc8bd0ac7b80cc84ae3abb75b
> Author: Namhyung Kim <namhyung@kernel.org>
> Date:   Thu Jun 8 16:31:03 2017 +0900
> 
>     perf tools: Introduce dso__decompress_kmodule_{fd,path}

This should now be fixed in the latest 4.9.y -rc release, right?

If not, please let me know as I though I resolved this problem there...

thanks,

greg k-h