Re: [PATCH] kernel/params.c: print failure information instead of'KOBJ_ADD' to user space, when sysfs_create_file() fails.

[Chen Gang]

On 07/11/2013 09:53 AM, Rusty Russell wrote:
> Chen Gang F T <chen.gang.flying.transformer@xxxxxxxxx> writes:
>> > On 07/09/2013 04:07 PM, Rusty Russell wrote:
>>> >> Chen Gang <gang.chen@xxxxxxxxxxx> writes:
>>>> >>> When sysfs_create_file() fails, recommend to print the related failure
>>>> >>> information. And it is useless to still 'KOBJ_ADD' to user space.
>>>> >>>
>>>> >>> Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
>>> >> 
>>> >> sysfs_create_file() should not fail during boot, should it?
>>> >> 
>> >
>> > Hmm..., please reference locate_module_kobject() in "kernel/params.c",
>> > which is an '__init' function, and also call sysfs_create_file(), it
>> > processes the related error.
>> >
>> > So I recommend to get the check too in version_sysfs_builtin().
> It still can't fail.  sysfs_create_file() can fail due to OOM (not at
> boot) or name duplication (not here).
> 
> You can BUG_ON() if you want.
> 

OK, thanks, I will send patch v2 for it.


> And feel free to fix locate_module_kobject() in a separate patch.

OK, thanks, I will send related patch for it.

:-)


Thanks.
-- 
Chen Gang
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