linux-kernel - Re: [PATCH v3] mm, thp: introduce generic transparent huge page allocation interfaces

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Date:   Fri, 8 Dec 2017 10:27:05 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     changbin.du@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm, thp: introduce generic transparent huge page
 allocation interfaces


Hi Andrew,
On Thu, Dec 07, 2017 at 03:45:19PM -0800, Andrew Morton wrote:
> On Thu,  7 Dec 2017 18:54:19 +0800 changbin.du@...el.com wrote:
> 
> > From: Changbin Du <changbin.du@...el.com>
[snip]
 > -static inline void prep_transhuge_page(struct page *page) {}
> > +#define alloc_transhuge_page_vma(gfp_mask, vma, addr) NULL
> > +#define alloc_transhuge_page_nodemask(gfp_mask, preferred_nid, nmask) NULL
> > +#define alloc_transhuge_page_node(nid, gfp_maskg) NULL
> > +#define alloc_transhuge_page(gfp_mask) NULL
> 
> Ugly.  And such things can cause unused-variable warnings in calling
> code.  Whereas
> 
> static inline struct page *alloc_transhuge_page_vma(gfp_t gfp_mask,
> 			struct vm_area_struct *vma, unsigned long addr)
> {
> 	return NULL;
> }
> 
> will avoid such warnings.
>
Thanks for pointing out, I will update it.
   
> 
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-- 
Thanks,
Changbin Du