linux-kernel - Re: [PATCH] staging: unisys: use kzalloc instead of kmalloc/memset 0

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Message-ID: <CAHb8M2DC51QMxmn-2ZwrjuMSCBzGKidvXpRZSd-8YUccuJhNag@mail.gmail.com>
Date:	Wed, 19 Mar 2014 13:32:44 +0900
From:	DaeSeok Youn <daeseok.youn@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	devel <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: unisys: use kzalloc instead of kmalloc/memset 0

Thanks for reply.
I will do that.

Regards,
Daeseok Youn.

2014-03-19 11:31 GMT+09:00 Greg KH <gregkh@...uxfoundation.org>:
> On Wed, Mar 19, 2014 at 10:04:40AM +0900, DaeSeok Youn wrote:
>> oh...
>> You didn't get my reply about vmalloc usage.
>>
>> My replay attach again, below.
>>
>> > 2014-03-18 9:37 GMT+09:00 Greg KH <gregkh@...uxfoundation.org>:
>> >> On Tue, Mar 18, 2014 at 09:26:07AM +0900, DaeSeok Youn wrote:
>> >>> I think vmalloc/kmalloc in uislib_malloc() can be removed and just use
>> >>> vmalloc/kmalloc directly.
>> >>
>> >> Yes.  Actually, just use kmalloc, I don't knwo why vmalloc is being
>> >> used, but cc: the driver maintainers just to be sure.
>> >
>> Here, need to check by you.
>> > It try to allocate 128KiB(131072byte) with vmalloc(). I think if it
>> > trying to allocate with kmalloc()
>> > it has a possibility to fail because of memory fragmentation even if
>> > system has enough memory to use.
>> > Just my opinion. If I'm wrong, let me know.
>
> Check to see just how big you are allocating, you should know based on
> the flags which code path happened uislib_malloc().
>
> Just keep the logic the same and you should be fine.
>
> greg k-h
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