On 14/09/18 16:18, Dongli Zhang wrote:
> Hi Juergen,
>
> On 09/14/2018 05:12 PM, Juergen Gross wrote:
>> 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.zh...@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.
>
> I did use kstrtou*() in the early prototype and realized kstrtou16() returns 0
> if the input string contains non-numerical characters.
>
> E.g., the example of input can be "1/0/state", where 1 is fotherend_id
> (frontend_id) and 0 is handle.
>
> When "1/0/state" is used at input, kstrtou16() returns 0 (returned integer)
> and
> -22 (error).
Aah, okay. Then simple_strtoul()?
Juergen
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