From: gregkh@linuxfoundation.org ('gregkh@linuxfoundation.org')
To: linux-arm-kernel@lists.infradead.org
Subject: change kmalloc into vmalloc for large memory allocations
Date: Fri, 28 Feb 2014 08:33:04 -0800 [thread overview]
Message-ID: <20140228163304.GA15614@kroah.com> (raw)
In-Reply-To: <35FD53F367049845BC99AC72306C23D102844605F38D@CNBJMBX05.corpusers.net>
On Fri, Feb 28, 2014 at 05:20:08PM +0800, Wang, Yalin wrote:
> Hi
>
>
> Yeah,
> Dma buffer must be allocated by kmalloc,
>
> But the modules I list should can all be changed to use
> vmalloc, because the buffer is only used by software,
> Not by any hardware .
Are you sure about that? The USB gadget driver needs DMA memory from
what I can tell, have you tried your change out on a system that does
not allow the USB controller to access non-DMA memory?
And I agree with Steve, just fix the individual drivers, don't do a
"hidden" change of where the memory is allocated from, that's not a good
idea and will cause problems later.
greg k-h
next prev parent reply other threads:[~2014-02-28 16:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-28 8:15 change kmalloc into vmalloc for large memory allocations Wang, Yalin
2014-02-28 8:54 ` Huang Shijie
2014-02-28 9:20 ` Wang, Yalin
2014-02-28 16:33 ` 'gregkh@linuxfoundation.org' [this message]
2014-03-03 2:51 ` Wang, Yalin
2014-03-03 3:08 ` 'gregkh@linuxfoundation.org'
2014-03-03 8:00 ` Wang, Yalin
2014-03-03 14:10 ` 'gregkh@linuxfoundation.org'
2014-03-04 7:30 ` [PATCH] netfilter:Change nf_conntrack modules to use vmalloc Wang, Yalin
2014-02-28 14:11 ` change kmalloc into vmalloc for large memory allocations Steven Rostedt
2014-02-28 14:19 ` Takashi Iwai
2014-03-03 1:55 ` Wang, Yalin
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