[RFC PATCH] ARM: mm: ADD descriptor string to CONFIG_DMA_ADDR_64BIT_T

Shilimkar, Santosh santosh.shilimkar at ti.com
Wed Sep 12 09:25:33 EDT 2012

On Wed, Sep 12, 2012 at 6:49 PM, Catalin Marinas
<catalin.marinas at arm.com> wrote:
> On Wed, Sep 12, 2012 at 01:57:26PM +0100, Shilimkar, Santosh wrote:
>> On Wed, Sep 12, 2012 at 6:16 PM, Cyril Chemparathy <cyril at ti.com> wrote:
>> >
>> > On 9/12/2012 1:50 AM, R Sricharan wrote:
>> >>
>> >> Even if CONFIG_DMA_ADDR_64BIT_T is enabled by the defconfig,
>> >> the feature is not getting selected.
>> >> Adding a string description in the Kconfig resolves this.
>> >>
>> >> But not sure if this is the right way to fix this.
>> >>
>> >
>> > Shouldn't you be selecting this in your 64-bit dma address capable arch
>> > instead?
>> >
>> Yes. The selection to enable  CONFIG_DMA_ADDR_64BIT_T happens
>> in the arch which needs it. Since this option was made as simple bool,
>> looks like because of some KCONFIG magic, it was not getting selected.
>> Adding some help text does fix the issue and thats is the patch all about.
> Are you sure you select this explicitly in Kconfig? It should not depend
> on a description.
You are right.

> What I understood from the initial email was that this option was only
> added to the defconfig but ignored by the kernel as it's not a user
> selectable option (unless you add some text).
That's right. Explicit KCONFIG select should work.


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