From: Namhyung Kim <namhyung@kernel.org>
To: Riccardo Mancini <rickyman7@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Ian Rogers <irogers@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-perf-users <linux-perf-users@vger.kernel.org>,
Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Subject: Re: [RFC PATCH v3 06/15] perf workqueue: introduce workqueue struct
Date: Tue, 24 Aug 2021 12:27:13 -0700 [thread overview]
Message-ID: <CAM9d7cjJuLdBtN_2it88v4VAmVZ5sSzcpDX-eU9A+hiyO3izaA@mail.gmail.com> (raw)
In-Reply-To: <9dee672538967a3cf7e82ef194ebccc709b1af41.1629454773.git.rickyman7@gmail.com>
Hi Riccardo,
On Fri, Aug 20, 2021 at 3:54 AM Riccardo Mancini <rickyman7@gmail.com> wrote:
> +/**
> + * workqueue_strerror - print message regarding lastest error in @wq
> + *
> + * Buffer size should be at least WORKQUEUE_STRERR_BUFSIZE bytes.
> + */
> +int workqueue_strerror(struct workqueue_struct *wq, int err, char *buf, size_t size)
> +{
> + int ret;
> + char sbuf[THREADPOOL_STRERR_BUFSIZE], *emsg;
> + const char *errno_str;
> +
> + errno_str = workqueue_errno_str[-err-WORKQUEUE_ERROR__OFFSET];
It seems easy to crash with an invalid err argument.
> +
> + switch (err) {
> + case -WORKQUEUE_ERROR__POOLNEW:
> + case -WORKQUEUE_ERROR__POOLEXE:
> + case -WORKQUEUE_ERROR__POOLSTOP:
> + case -WORKQUEUE_ERROR__POOLSTARTTHREAD:
> + if (IS_ERR_OR_NULL(wq))
> + return scnprintf(buf, size, "%s: unknown.\n",
> + errno_str);
> +
> + ret = threadpool__strerror(wq->pool, wq->pool_errno, sbuf, sizeof(sbuf));
> + if (ret < 0)
> + return ret;
> + return scnprintf(buf, size, "%s: %s.\n", errno_str, sbuf);
> + case -WORKQUEUE_ERROR__WRITEPIPE:
> + case -WORKQUEUE_ERROR__READPIPE:
> + emsg = str_error_r(errno, sbuf, sizeof(sbuf));
This means the errno should be kept before calling this, right?
> + return scnprintf(buf, size, "%s: %s.\n", errno_str, emsg);
> + case -WORKQUEUE_ERROR__INVALIDMSG:
> + return scnprintf(buf, size, "%s.\n", errno_str);
> + default:
> + emsg = str_error_r(err, sbuf, sizeof(sbuf));
> + return scnprintf(buf, size, "Error: %s", emsg);
Newline at the end?
Thanks,
Namhyung
> + }
> +}
> +
next prev parent reply other threads:[~2021-08-24 19:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 10:53 [RFC PATCH v3 00/15] perf: add workqueue library and use it in synthetic-events Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 01/15] perf workqueue: threadpool creation and destruction Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 02/15] perf tests: add test for workqueue Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 03/15] perf workqueue: add threadpool start and stop functions Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 04/15] perf workqueue: add threadpool execute and wait functions Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 05/15] tools: add sparse context/locking annotations in compiler-types.h Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 06/15] perf workqueue: introduce workqueue struct Riccardo Mancini
2021-08-24 19:27 ` Namhyung Kim [this message]
2021-08-31 16:13 ` Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 07/15] perf workqueue: implement worker thread and management Riccardo Mancini
2021-08-30 7:22 ` Jiri Olsa
2021-08-20 10:53 ` [RFC PATCH v3 08/15] perf workqueue: add queue_work and flush_workqueue functions Riccardo Mancini
2021-08-24 19:40 ` Namhyung Kim
2021-08-31 16:23 ` Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 09/15] perf workqueue: spinup threads when needed Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 10/15] perf workqueue: create global workqueue Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 11/15] perf workqueue: add utility to execute a for loop in parallel Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 12/15] perf record: setup global workqueue Riccardo Mancini
2021-08-20 10:53 ` [RFC PATCH v3 13/15] perf top: " Riccardo Mancini
2021-08-20 10:54 ` [RFC PATCH v3 14/15] perf test/synthesis: " Riccardo Mancini
2021-08-20 10:54 ` [RFC PATCH v3 15/15] perf synthetic-events: use workqueue parallel_for Riccardo Mancini
2021-08-29 21:59 ` [RFC PATCH v3 00/15] perf: add workqueue library and use it in synthetic-events Jiri Olsa
2021-08-31 15:46 ` Jiri Olsa
2021-08-31 16:57 ` Riccardo Mancini
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