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Re: [Xen-devel] [PATCH V2 3/6] [RFC] xen/common: Introduce _xrealloc function
- To: Oleksandr <olekstysh@xxxxxxxxx>
- From: Jan Beulich <JBeulich@xxxxxxxx>
- Date: Thu, 8 Aug 2019 07:05:08 +0000
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- Cc: "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, AndrewCooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "julien.grall@xxxxxxx" <julien.grall@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 08 Aug 2019 07:07:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH V2 3/6] [RFC] xen/common: Introduce _xrealloc function
(I'm sorry if you receive duplicates of this, but I've got a reply
back from our mail system that several of the recipients did not
have their host names resolved correctly on the first attempt.)
On 07.08.2019 20:36, Oleksandr wrote:
>> There's one more thing for the re-alloc case though (besides
>> cosmetic aspects): The incoming pointer should also be verified
>> to be of correct type.
>
> Jan, how this could be technically implemented, or are these any existing
> examples in Xen?
See x86's copy_to_guest_offset(), for example. To get the compiler
to emit a warning (at least), a (typically otherwise dead)
comparison of pointers is commonly used.
Jan
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