linux-kernel - Re: [PATCH 10/31] perf test: Enforce LLVM test for BPF test

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Date:	Tue, 3 Nov 2015 15:24:11 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, ast@...mgrid.com,
	brendan.d.gregg@...il.com, a.p.zijlstra@...llo.nl,
	daniel@...earbox.net, dsahern@...il.com, hekuang@...wei.com,
	jolsa@...nel.org, lizefan@...wei.com,
	masami.hiramatsu.pt@...achi.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, pi3orama@....com, xiakaixu@...wei.com
Subject: Re: [PATCH 10/31] perf test: Enforce LLVM test for BPF test

Em Thu, Oct 15, 2015 at 07:58:38PM +0800, Wangnan (F) escreveu:
> >>+void test__llvm_prepare(void)
> >>+{
> >>+	p_test_llvm__bpf_result = mmap(NULL, SHARED_BUF_INIT_SIZE,
> >>+				       PROT_READ | PROT_WRITE,
> >>+				       MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> >>+	if (!p_test_llvm__bpf_result)
> >It should check MAP_FAILED instead.
> >
> 
> Fixed by this way:

Can you please try refreshing this patchset on top of what is now in
acme/perf/core?

Also why do we need those struct test->{prepare,cleanup} pointers? You
introduced it and then, on the next patch that touches 'perf test' and
uses test__llvm_{prepare,cleanup} you call them directly, which I think
should be enough, i.e. keep them as functions to call from inside
the test called from run_test(), right?

- Arnaldo
 
> diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
> index e722e8a..25ddeaf 100644
> --- a/tools/perf/tests/llvm.c
> +++ b/tools/perf/tests/llvm.c
> @@ -199,12 +199,15 @@ void test__llvm_prepare(void)
> 
>         for (i = 0; llvm_testcases[i].source; i++) {
>                 struct test_llvm__bpf_result *result;
> +               void *p;
> 
> -               result = mmap(NULL, SHARED_BUF_INIT_SIZE,
> -                             PROT_READ | PROT_WRITE,
> -                             MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> -               if (!result)
> +               p = mmap(NULL, SHARED_BUF_INIT_SIZE,
> +                        PROT_READ | PROT_WRITE,
> +                        MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> +               if (p == MAP_FAILED)
>                         return;
> +
> +               result = p;
>                 memset((void *)result, '\0', SHARED_BUF_INIT_SIZE);
> 
>                 llvm_testcases[i].result = result;
> 
> Thank you.
--
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