linux-kernel - Re: [PATCH] perf symbol: Add LoongArch case in get_plt

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Date:   Mon, 22 May 2023 11:50:58 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Leo Yan <leo.yan@...aro.org>, Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] perf symbol: Add LoongArch case in get_plt_sizes()

Hi, Arnaldo,

On Thu, May 18, 2023 at 8:16 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Thu, May 18, 2023 at 12:05:53PM +0800, Leo Yan escreveu:
> > On Thu, May 18, 2023 at 11:57:29AM +0800, Huacai Chen wrote:
> > > On Thu, May 18, 2023 at 11:21 AM Leo Yan <leo.yan@...aro.org> wrote:
> > > >
> > > > On Thu, May 18, 2023 at 11:12:26AM +0800, Huacai Chen wrote:
> > > > > On Thu, May 18, 2023 at 11:06 AM Leo Yan <leo.yan@...aro.org> wrote:
> > > > > >
> > > > > > On Thu, May 18, 2023 at 10:11:27AM +0800, Huacai Chen wrote:
> > > > > > > Queued, thanks.
> > > > > >
> > > > > > The patch is fine for me.
> > > > > >
> > > > > > Should not perf patches are to be merged via Arnaldo's tree?
> > > > >
> > > > > I think both are OK, if Arnaldo takes this patch, I will drop it.
> > > >
> > > > A good practice is to firstly inquiry the maintainers.
> > > >
> > > > AFAIK, Arnaldo will test perf patches before sending out pull request;
> > > > if perf patches are scattered out, it might be out of the testing
> > > > radar.
> > > OK, I know, thank you very much.
> >
> > You are welcome!
> >
> > I found the code base for bfd:
> > https://github.com/bminor/binutils-gdb/blob/master/bfd/elfnn-loongarch.c
> >
> > And this patch is consistent with above link, FWIW:
> >
> > Reviewed-by: Leo Yan <leo.yan@...aro.org>
>
> Thanks, applied.
I'm very sorry that this patch breaks cross-build. We need some
additional modification.

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 5d409c26a22e..b3dbf6ca99a7 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -35,6 +35,10 @@
 #define EM_AARCH64     183  /* ARM 64 bit */
 #endif

+#ifndef EM_LOONGARCH
+#define EM_LOONGARCH   258
+#endif
+
 #ifndef ELF32_ST_VISIBILITY
 #define ELF32_ST_VISIBILITY(o) ((o) & 0x03)
 #endif

Then, drop this patch to get an updated version, or let me send an
incremental patch?

Huacai

>
> - Arnaldo
>