[U-Boot] [PATCH] core: of_addr: Correct the size type of of_get_address to fdt_size_t
sjg at chromium.org
Tue Sep 17 05:47:53 UTC 2019
On Mon, 26 Aug 2019 at 11:16, Eugeniu Rosca <erosca at de.adit-jv.com> wrote:
> Hi Keerthy,
> Hi Simon,
> cc: Tom
> On Tue, Aug 20, 2019 at 09:39:32AM +0530, Keerthy wrote:
> > On 19/08/19 3:54 PM, Eugeniu Rosca wrote:
> > > I took some time to also review the changes in addition to testing.
> > >
> > > I can see that, since its inception in Linux , of_get_address() used
> > > 'u64*' type for its 'size' argument. That's still valid in v5.3-rc5.
> > > So, it looks to me that with this patch we diverge from Linux.
> > >
> > > I would barely think that the ASAN issue being fixed in this patch
> > > exists in Linux, since the latter receives much more KASAN-enabled
> > > testing on regular basis.
> > >
> > > Do you foresee any alternative fix w/o diverging from Linux?
> > I am afraid No but isn't fdt_size_t also right type to represent size?
> 'fdt_size_t' is a U-Boot-ism, i.e. it exists nowhere else but in U-Boot.
> Just for the record, it appears to be added by Simon's v2013.04 commit
> 4397a2a80baef ("fdt: Add fdtdec_get_addr_size() to read reg properties")
> IMHO injecting a U-Boot-specific data type into the prototype of a
> Linux-backported function has below major drawbacks:
> - It is a non-upstream-able solution. Linux will unlikely accept
> 'fdt_size_t' as a new type simply b/c Linux OF code existed over
> a decade and it didn't need this type so far.
> - Mutilating Linux upstream code will make further U-Boot backports
> painful, time consuming and error-prone.
> Are we on the same page here?
> > >  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22ae782f86b7
> > >
Yes I agree.
What do people think about this approach?
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