From: Juergen Gross <jgross@suse.com>
To: Dongli Zhang <dongli.zhang@oracle.com>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: boris.ostrovsky@oracle.com, paul.durrant@citrix.com,
wei.liu2@citrix.com, konrad.wilk@oracle.com,
roger.pau@citrix.com, srinivas.eeda@oracle.com
Subject: Re: [PATCH 5/6] xenbus: process be_watch events in xenwatch multithreading
Date: Fri, 14 Sep 2018 11:12:13 +0200 [thread overview]
Message-ID: <8d6457cf-a105-3d88-bd38-d46b24f70501@suse.com> (raw)
In-Reply-To: <1536910456-13337-6-git-send-email-dongli.zhang@oracle.com>
On 14/09/18 09:34, Dongli Zhang wrote:
> This is the 5th patch of a (6-patch) patch set.
>
> With this patch, watch event in relative path pattern
> 'backend/<pvdev>/<domid>i/...' can be processed in per-domU xenwatch
superfluous "i" ----------^
> thread.
>
> Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
> ---
> drivers/xen/xenbus/xenbus_probe.c | 2 +-
> drivers/xen/xenbus/xenbus_probe_backend.c | 32 +++++++++++++++++++++++++++++++
> include/xen/xenbus.h | 2 ++
> 3 files changed, 35 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index ba0644c..aa1b15a 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -552,7 +552,7 @@ int xenbus_probe_devices(struct xen_bus_type *bus)
> }
> EXPORT_SYMBOL_GPL(xenbus_probe_devices);
>
> -static unsigned int char_count(const char *str, char c)
> +unsigned int char_count(const char *str, char c)
Please change the name of the function when making it globally
visible, e.g. by prefixing "xenbus_".
Generally I think you don't need to use it below.
> {
> unsigned int i, ret = 0;
>
> diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
> index b0bed4f..50df86a 100644
> --- a/drivers/xen/xenbus/xenbus_probe_backend.c
> +++ b/drivers/xen/xenbus/xenbus_probe_backend.c
> @@ -211,9 +211,41 @@ static void backend_changed(struct xenbus_watch *watch,
> xenbus_dev_changed(path, &xenbus_backend);
> }
>
> +static domid_t path_to_domid(const char *path)
> +{
> + const char *p = path;
> + domid_t domid = 0;
> +
> + while (*p) {
> + if (*p < '0' || *p > '9')
> + break;
> + domid = (domid << 3) + (domid << 1) + (*p - '0');
reinventing atoi()?
Please don't do that. kstrtou16() seems to be a perfect fit.
> + p++;
> + }
> +
> + return domid;
> +}
> +
> +/* path: backend/<pvdev>/<domid>/... */
> +static domid_t be_get_domid(struct xenbus_watch *watch,
> + const char *path,
> + const char *token)
> +{
> + const char *p = path;
> +
> + if (char_count(path, '/') < 2)
> + return 0;
> +
> + p = strchr(p, '/') + 1;
> + p = strchr(p, '/') + 1;
Drop the call of char_count() above and test p for being non-NULL
after each call of strchr?
Juergen
next prev parent reply other threads:[~2018-09-14 9:12 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 7:34 Introduce xenwatch multithreading (mtwatch) Dongli Zhang
2018-09-14 7:34 ` [PATCH 1/6] xenbus: prepare data structures and parameter for xenwatch multithreading Dongli Zhang
2018-09-14 8:11 ` Paul Durrant
2018-09-14 13:40 ` [Xen-devel] " Dongli Zhang
2018-09-14 8:32 ` Juergen Gross
2018-09-14 13:57 ` [Xen-devel] " Dongli Zhang
2018-09-14 14:10 ` Juergen Gross
2018-09-16 20:17 ` Boris Ostrovsky
2018-09-17 1:20 ` Dongli Zhang
2018-09-17 19:08 ` Boris Ostrovsky
2018-09-25 5:14 ` Dongli Zhang
2018-09-25 20:19 ` Boris Ostrovsky
2018-09-26 2:57 ` [Xen-devel] " Dongli Zhang
2018-09-14 7:34 ` [PATCH 2/6] xenbus: implement the xenwatch multithreading framework Dongli Zhang
2018-09-14 8:45 ` Paul Durrant
2018-09-14 14:09 ` [Xen-devel] " Dongli Zhang
2018-09-14 8:56 ` Juergen Gross
2018-09-16 21:20 ` Boris Ostrovsky
2018-09-17 1:48 ` [Xen-devel] " Dongli Zhang
2018-09-17 20:00 ` Boris Ostrovsky
2018-09-14 7:34 ` [PATCH 3/6] xenbus: dispatch per-domU watch event to per-domU xenwatch thread Dongli Zhang
2018-09-14 9:01 ` Juergen Gross
2018-09-17 20:09 ` Boris Ostrovsky
2018-09-14 7:34 ` [PATCH 4/6] xenbus: process otherend_watch event at 'state' entry in xenwatch multithreading Dongli Zhang
2018-09-14 9:04 ` Juergen Gross
2018-09-14 7:34 ` [PATCH 5/6] xenbus: process be_watch events " Dongli Zhang
2018-09-14 9:12 ` Juergen Gross [this message]
2018-09-14 14:18 ` [Xen-devel] " Dongli Zhang
2018-09-14 14:26 ` Juergen Gross
2018-09-14 14:29 ` Dongli Zhang
2018-09-14 14:44 ` Juergen Gross
2018-09-19 6:15 ` Dongli Zhang
2018-09-19 8:01 ` Juergen Gross
2018-09-19 12:27 ` Dongli Zhang
2018-09-19 12:44 ` Juergen Gross
2018-09-14 14:33 ` Dongli Zhang
2018-09-14 7:34 ` [PATCH 6/6] drivers: enable xenwatch multithreading for xen-netback and xen-blkback driver Dongli Zhang
2018-09-14 9:16 ` Juergen Gross
2018-09-14 9:38 ` Wei Liu
2018-09-14 9:56 ` Roger Pau Monné
2018-09-14 8:16 ` Introduce xenwatch multithreading (mtwatch) Paul Durrant
2018-09-14 9:18 ` Juergen Gross
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