Re: [Xen-devel] [PATCH] x86/mm: Rearrange guest_get_eff_{, kern_}l1e() not be void

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Aug 30, 2017 at 02:22:05PM +0100, Andrew Cooper wrote:
> Coverity complains that gl1e.l1 may be used while uninitialised in
> map_ldt_shadow_page().  This isn't actually accurate as guest_get_eff_l1e()
> will always write to its parameter.
> 
> However, having a void function which returns a 64bit value via pointer is
> rather silly.  Rearrange the functions to return l1_pgentry_t.
> 
> No functional change, but hopefully should help Coverity not to come to the
> wrong conclusion.
> 
> Bloat-o-meter also reports a modest improvement:
>   add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-71 (-71)
>   function                                     old     new   delta
>   guest_get_eff_l1e                             82      75      -7
>   mmio_ro_do_page_fault                        530     514     -16
>   map_ldt_shadow_page                          501     485     -16
>   ptwr_do_page_fault                           615     583     -32
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel