linux-kernel - Re: kernel-4.9.94 compile error: 'KMOD_DECOMP

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Date:   Sat, 28 Apr 2018 10:11:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Teck Choon Giam <giamteckchoon@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, acme@...nel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>
Subject: Re: kernel-4.9.94 compile error: 'KMOD_DECOMP_LEN' undeclared

On Fri, Apr 27, 2018 at 11:09:56PM -0700, Randy Dunlap wrote:
> On 04/27/2018 10:00 PM, Greg Kroah-Hartman wrote:
> > 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@...nel.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...
> 
> It still fails in 4.9.96. (not #defined there)

Should be fixed in 4.9.97-r1, I know .96 still had the issue.

thanks,

greg k-h