Re: [Xen-devel] [External] Re: [RFC PATCH v2 10/12] mm/zsmalloc: update usage of address zone modifiers

[Huaisheng HS1 Ye <yehs1@xxxxxxxxxx>]

From: owner-linux-mm@xxxxxxxxx On Behalf Of Matthew Wilcox
> 
> On Mon, May 21, 2018 at 11:20:31PM +0800, Huaisheng Ye wrote:
> > @@ -343,7 +343,7 @@ static void destroy_cache(struct zs_pool *pool)
> >  static unsigned long cache_alloc_handle(struct zs_pool *pool, gfp_t gfp)
> >  {
> >     return (unsigned long)kmem_cache_alloc(pool->handle_cachep,
> > -                   gfp & ~(__GFP_HIGHMEM|__GFP_MOVABLE));
> > +                   gfp & ~__GFP_ZONE_MOVABLE);
> >  }
> 
> This should be & ~GFP_ZONEMASK
> 
> Actually, we should probably have a function to clear those bits rather
> than have every driver manipulating the gfp mask like this.  Maybe
> 
> #define gfp_normal(gfp)               ((gfp) & ~GFP_ZONEMASK)

Good idea!

> 
>       return (unsigned long)kmem_cache_alloc(pool->handle_cachep,
> -                     gfp & ~(__GFP_HIGHMEM|__GFP_MOVABLE));
> +                     gfp_normal(gfp));


Sincerely,
Huaisheng Ye

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