linux-kernel - Re: [PATCH] perf test shell: Add -D to check dynamic symbols for ubuntu/debian

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Date:   Wed, 9 May 2018 15:36:58 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     <linux-kernel@...r.kernel.org>, <acme@...nel.org>
CC:     <philip.li@...el.com>, <brueckner@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] perf test shell: Add -D to check dynamic symbols for
 ubuntu/debian

ping


On 12/27/2017 04:50 PM, Li Zhijian wrote:
> On Ubuntu and Debian, we can't find any symbol including "inet_pton" from 'nm -g'
> root@...lkp-nex04-8G-5 ~# nm -g /lib/x86_64-linux-gnu/libc-2.25.so | grep inet_pton
> nm: /lib/x86_64-linux-gnu/libc-2.25.so: no symbols
>
> it looks libc.so has different symbol compositions at different distros
>
> Usage: nm [option(s)] [file(s)]
>   List symbols in [file(s)] (a.out by default).
>   The options are:
> ...snip...
>    -D, --dynamic          Display dynamic symbols instead of normal symbols
>        --defined-only     Display only defined symbols
>    -e                     (ignored)
>    -f, --format=FORMAT    Use the output format FORMAT.  FORMAT can be `bsd',
>                             `sysv' or `posix'.  The default is `bsd'
>    -g, --extern-only      Display only external symbols
>
> I tested both debian/ubuntu and RHEL, they work as expected
>
> CC: Thomas Richter <tmricht@...ux.vnet.ibm.com>
> CC: Arnaldo Carvalho de Melo <acme@...hat.com>
> Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
> ---
>   tools/perf/tests/shell/trace+probe_libc_inet_pton.sh | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> index 8b3da21..f939bd6 100755
> --- a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> +++ b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> @@ -11,7 +11,7 @@
>   . $(dirname $0)/lib/probe.sh
>   
>   libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
> -nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
> +nm -gD $libc 2>/dev/null | fgrep -q inet_pton || exit 254
>   
>   trace_libc_inet_pton_backtrace() {
>   	idx=0