Re: [PATCH v2 1/2] xen/xenbus: avoid large structs and arrays on the stack

[Boris Ostrovsky]

On 7/1/20 8:16 AM, Juergen Gross wrote:
> xenbus_map_ring_valloc() and its sub-functions are putting quite large
> structs and arrays on the stack. This is problematic at runtime, but
> might also result in build failures (e.g. with clang due to the option
> -Werror,-Wframe-larger-than=... used).
>
> Fix that by moving most of the data from the stack into a dynamically
> allocated struct. Performance is no issue here, as
> xenbus_map_ring_valloc() is used only when adding a new PV device to
> a backend driver.
>
> While at it move some duplicated code from pv/hvm specific mapping
> functions to the single caller.
>
> Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>