Re: [Xen-devel] [PATCH] xen/gntdev: Don't allocate struct gntdev_copy_batch on stack

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 15/01/16 19:43, Boris Ostrovsky wrote:
> struct gntdev_copy_batch is over 1300 bytes in size, we shouldn't
> put it on stack.
> 
> Some compilers (e.g. 5.2.1) complain:
>  drivers/xen/gntdev.c: In function âgntdev_ioctl_grant_copy.isra.5â:
>  drivers/xen/gntdev.c:949:1: warning: the frame size of 1416 bytes
>   is larger than 1024 bytes [-Wframe-larger-than=]

I thought I'd already reduced the size of this enough (from a batch size
of 32 to 24) but this obviously isn't enough for 64-bit platforms.

In the absence of any performance data on the best approach I would
prefer just reducing the batch size to 16.

David


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