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From: Howard Yen <howardyen@google.com>
Date: Mon, 11 Mar 2024 18:10:47 +0800
Message-ID: <CAJDAHvbRSm_UYgx0fE7o2dJqcBfBbcFR4DrnVydkwfxGo0O4Rg@mail.gmail.com>
Subject: Re: [PATCH v5 0/2] Add support for multiple coherent memory regions
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: gregkh@linuxfoundation.org, rafael@kernel.org, mathias.nyman@intel.com, 
	hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, 
	petr.tesarik.ext@huawei.com, broonie@kernel.org, james@equiv.tech, 
	james.clark@arm.com, masahiroy@kernel.org, linux-kernel@vger.kernel.org, 
	linux-usb@vger.kernel.org, iommu@lists.linux.dev
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On Mon, Mar 11, 2024 at 6:03=E2=80=AFPM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Mon, Mar 11, 2024 at 09:49:45AM +0000, Howard Yen wrote:
> > In the system I'm working on, there is an always-on subsystem which
> > includes a small size memory, and several functions need to run and
> > occupy the memory from the small memory if they need to run on the
> > always-on subsystem. These functions must allocate the memory from the
> > small memory region, so that they can get benefit from the always-on
> > subsystem. So the small memory is split for multiple functions which ar=
e
> > satisfied with their generic use cases. But in specific use cases, like
> > USB3 devices which support the stream trasnsfer or multiple devices
> > connect to the host, they required more memory than their pre-allocated
> > memory region. I tried to implement it in a generic way and propose thi=
s
> > patch to give it the ability to get the memory from the other larger
> > memory to solve the issue.
>
> > Changelog
> > --------------------------------------------
> > Changes in v5:
> > - Fix build break.
> > - Use of_property_count_u32_elems() instead of
> >   of_property_count_elems_of_size().
>
> Have you tried to use --histogram diff algo?

Yes, I used the below command to create the patch v5.
`git format-patch --cover-letter --histogram -v5 51b70ff55`

>
> --
> With Best Regards,
> Andy Shevchenko
>
>


--=20
Best Regards,

Howard