Re: [Xen-devel] [PATCH v2 3/4] libxc/tbuf: Use the xc_hypercall_bounce_[pre|post] instead of memcpy

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jun 18, 2014 at 02:55:05PM +0100, Ian Campbell wrote:
> On Fri, 2014-06-13 at 16:41 -0400, Konrad Rzeszutek Wilk wrote:
> > for bounce buffer of the xc_cpumask_t.
> 
> You just added this stuff in the previous patch. Why not fold?

I was thinking it might be a bit too busy.

But I will be more than happy to fold it in.
> 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > ---
> >  tools/libxc/xc_tbuf.c |   13 ++++++-------
> >  1 files changed, 6 insertions(+), 7 deletions(-)
> > 
> > diff --git a/tools/libxc/xc_tbuf.c b/tools/libxc/xc_tbuf.c
> > index 2828aee..85156dd 100644
> > --- a/tools/libxc/xc_tbuf.c
> > +++ b/tools/libxc/xc_tbuf.c
> > @@ -116,7 +116,7 @@ int xc_tbuf_disable(xc_interface *xch)
> >  int xc_tbuf_set_cpu_mask(xc_interface *xch, xc_cpumap_t mask, int bits)
> >  {
> >      DECLARE_SYSCTL;
> > -    DECLARE_HYPERCALL_BUFFER(uint8_t, bytemap);
> > +    DECLARE_HYPERCALL_BOUNCE(mask, 0, XC_HYPERCALL_BUFFER_BOUNCE_IN);
> 
> s/0/DIV_ROUND_UP(bits, 8)/ works here and avoids the need for
> HYPERCALL_BOUNCE_SET_SIZE (I think). 

<nods>
> 
> The SET_SIZE macro is only generally used when you don't know the size
> at declaration time (i.e. because you need to query it first).
> 
> Ian.
> 

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