Re: [Xen-devel] [PATCH 13/20] xen/arm32: mm: Avoid to zero and clean cache for CPU0 domheap

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

On 03.05.19 20:06, Julien Grall wrote:
> In C, uninitialized global variable will be zero by default. It is a bit of 
> waste to allocate space in the binary for them. So the compiler will commonly 
> put them in a section BSS that are going to be zeroed when at launch.
>
> On Arm32, this is always done in CPU0 at early boot. For Arm64, UEFI will do it 
> for us, so we don't want to do it when using UEFI as we may override global
>
> The reason I chose to say "will always be zeroed beforehand" than specifically mention 
> "BSS" is I wasn't entirely convinced the compiler will always put in BSS.
OK.

--
Sincerely,
Andrii Anisov.

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