Re: Patch "perf test: Ignore kcore files in the "vmlinux matches kallsyms" test" has been added to the 4.4-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Aug 08, 2016 at 11:37:56AM +0200, Jiri Slaby wrote:
> On 08/02/2016, 09:03 AM, gregkh@linuxfoundation.org wrote:
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > Date: Tue, 19 Apr 2016 12:16:55 -0300
> > Subject: perf test: Ignore kcore files in the "vmlinux matches kallsyms" test
> > 
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > 
> > commit 53d0fe68275dbdaf6a532bb4e87f00db5d36c140 upstream.
> ...
> > --- a/tools/perf/tests/vmlinux-kallsyms.c
> > +++ b/tools/perf/tests/vmlinux-kallsyms.c
> > @@ -54,8 +54,14 @@ int test__vmlinux_matches_kallsyms(void)
> >  	 * Step 3:
> >  	 *
> >  	 * Load and split /proc/kallsyms into multiple maps, one per module.
> > +	 * Do not use kcore, as this test was designed before kcore support
> > +	 * and has parts that only make sense if using the non-kcore code.
> > +	 * XXX: extend it to stress the kcorre code as well, hint: the list
> > +	 * of modules extracted from /proc/kcore, in its current form, can't
> > +	 * be compacted against the list of modules found in the "vmlinux"
> > +	 * code and with the one got from /proc/modules from the "kallsyms" code.
> >  	 */
> > -	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
> > +	if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true, NULL) <= 0) {
> 
> __machine__load_kallsyms is only in 4.7+. So this patch breaks build of
> perf:
> perf-in.o: In function `test__vmlinux_matches_kallsyms':
> tools/perf/tests/vmlinux-kallsyms.c:64: undefined reference to
> `__machine__load_kallsyms'
> collect2: error: ld returned 1 exit status
> Makefile.perf:316: recipe for target 'perf' failed
> 
> It is only a test fix, so I think the patch should be dropped from both
> 4.4 and 4.6.

Yeah, I got another report of this over the weekend, I've now dropped
this patch, sorry about that.

greg k-h