Re: [PATCH] x86: improve algorithm in clflush_cache_range

[Ross Zwisler]

On Thu, 2015-03-12 at 12:09 +0100, Ingo Molnar wrote:
> * Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> wrote:
> 
> > The current algorithm used in clflush_cache_range() can cause the last
> > cache line of the buffer to be flushed twice.
> > 
> > Fix that algorithm so that each cache line will only be flushed once,
> > and remove arithmetic on void pointers.  Void pointer arithmetic is
> > allowed by GCC extensions, but isn't part of the base C standards.
> 
> The optimization itself is fine, but that last argument is bogus: the 
> Linux kernel very much relies on 'void *' arithmetics in a gazillion 
> places.

Okay.  Are you happy with the patch as is or would you like me to
resubmit with that bit omitted from the change log?

- Ross

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