From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Namhyung Kim <namhyung@kernel.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
linux-trace-users@vger.kernel.org,
linux-kselftest@vger.kernel.org, shuah@kernel.org,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: Re: [PATCH v6 10/21] tracing: probeevent: Return consumed bytes of dynamic area
Date: Mon, 2 Apr 2018 16:02:07 -0400 [thread overview]
Message-ID: <20180402160207.23c96309@gandalf.local.home> (raw)
In-Reply-To: <152129069244.31874.7879658400858676349.stgit@devbox>
On Sat, 17 Mar 2018 21:44:52 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:
> -static nokprobe_inline void
> -fetch_store_string(unsigned long addr, void *dest)
> +static nokprobe_inline int
> +fetch_store_string(unsigned long addr, void *dest, void *base)
> {
> - int maxlen = get_rloc_len(*(u32 *)dest);
> - u8 *dst = get_rloc_data(dest);
> + int maxlen = get_loc_len(*(u32 *)dest);
> + u8 *dst = get_loc_data(dest, base);
> long ret;
>
> if (!maxlen)
> - return;
> + return -ENOMEM;
>
> /*
> * Try to get string again, since the string can be changed while
> @@ -854,19 +851,19 @@ fetch_store_string(unsigned long addr, void *dest)
>
> if (ret < 0) { /* Failed to fetch string */
> dst[0] = '\0';
> - *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
> - } else {
> - *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest));
> + ret = 0;
Why do you return 0 here and not the error value? You return -ENOMEM
above if maxlen is zero.
-- Steve
> }
> + *(u32 *)dest = make_data_loc(ret, (void *)dst - base);
> + return ret;
> }
next prev parent reply other threads:[~2018-04-02 20:02 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-17 12:37 [PATCH v6 00/21] tracing: probeevent: Improve fetcharg features Masami Hiramatsu
2018-03-17 12:38 ` [PATCH v6 01/21] [BUGFIX] tracing: probeevent: Fix to support minus offset from symbol Masami Hiramatsu
2018-03-17 12:38 ` [PATCH v6 02/21] selftests: ftrace: Add probe event argument syntax testcase Masami Hiramatsu
2018-03-17 12:39 ` [PATCH v6 03/21] selftests: ftrace: Add a testcase for string type with kprobe_event Masami Hiramatsu
2018-03-17 12:40 ` [PATCH v6 04/21] selftests: ftrace: Add a testcase for probepoint Masami Hiramatsu
2018-03-23 16:19 ` Steven Rostedt
2018-03-17 12:41 ` [PATCH v6 05/21] tracing: probeevent: Cleanup print argument functions Masami Hiramatsu
2018-03-23 16:36 ` Steven Rostedt
2018-03-26 4:17 ` Masami Hiramatsu
2018-03-26 17:28 ` Steven Rostedt
2018-03-28 4:21 ` Masami Hiramatsu
2018-03-17 12:41 ` [PATCH v6 06/21] tracing: probeevent: Cleanup argument field definition Masami Hiramatsu
2018-03-17 12:42 ` [PATCH v6 07/21] tracing: probeevent: Remove NOKPROBE_SYMBOL from print functions Masami Hiramatsu
2018-03-17 12:43 ` [PATCH v6 08/21] tracing: probeevent: Introduce new argument fetching code Masami Hiramatsu
2018-03-17 12:44 ` [PATCH v6 09/21] tracing: probeevent: Unify fetch type tables Masami Hiramatsu
2018-03-17 12:44 ` [PATCH v6 10/21] tracing: probeevent: Return consumed bytes of dynamic area Masami Hiramatsu
2018-04-02 20:02 ` Steven Rostedt [this message]
2018-04-03 14:41 ` Masami Hiramatsu
2018-03-17 12:45 ` [PATCH v6 11/21] tracing: probeevent: Append traceprobe_ for exported function Masami Hiramatsu
2018-03-17 12:46 ` [PATCH v6 12/21] tracing: probeevent: Unify fetch_insn processing common part Masami Hiramatsu
2018-03-17 12:47 ` [PATCH v6 13/21] tracing: probeevent: Add symbol type Masami Hiramatsu
2018-03-17 12:47 ` [PATCH v6 14/21] x86: ptrace: Add function argument access API Masami Hiramatsu
2018-03-17 12:48 ` [PATCH v6 15/21] tracing: probeevent: Add $argN for accessing function args Masami Hiramatsu
2018-03-17 12:49 ` [PATCH v6 16/21] tracing: probeevent: Add array type support Masami Hiramatsu
2018-03-17 12:50 ` [PATCH v6 17/21] selftests: ftrace: Add a testcase for symbol type Masami Hiramatsu
2018-03-17 12:50 ` [PATCH v6 18/21] selftests: ftrace: Add a testcase for $argN with kprobe_event Masami Hiramatsu
2018-03-17 12:51 ` [PATCH v6 19/21] selftests: ftrace: Add a testcase for array type " Masami Hiramatsu
2018-03-17 12:52 ` [PATCH v6 20/21] [RESEND] perf-probe: Fix to convert array type collectly Masami Hiramatsu
2018-03-20 6:36 ` [tip:perf/core] perf probe: Use right type to access array elements tip-bot for Masami Hiramatsu
2018-03-17 12:53 ` [PATCH v6 21/21] perf-probe: Add array argument support Masami Hiramatsu
2018-03-19 7:59 ` Ravi Bangoria
2018-03-22 10:23 ` Masami Hiramatsu
2018-03-22 10:49 ` Ravi Bangoria
2018-03-26 3:53 ` Masami Hiramatsu
2018-03-17 14:06 ` [PATCH v6 00/21] tracing: probeevent: Improve fetcharg features Masami Hiramatsu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180402160207.23c96309@gandalf.local.home \
--to=rostedt@goodmis.org \
--cc=acme@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-trace-users@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=ravi.bangoria@linux.vnet.ibm.com \
--cc=shuah@kernel.org \
--cc=tom.zanussi@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).