Re: [PATCH] mm/page_alloc.c: drop dead destroy_compound_page()

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On Tue, Jan 06, 2015 at 06:43:49PM +0100, Vlastimil Babka wrote:
> On 01/05/2015 12:46 PM, Kirill A. Shutemov wrote:
> > The only caller is __free_one_page(). By the time we should have
> > page->flags to be cleared already:
> > 
> >  - for 0-order pages though PCP list:
> 
> Can there even be a 0-order compound page? I guess not, so this is just confusing?

No, it can't.

Since I propose the VM_BUG_ON(page->flags), I tried to make point that
flags are cleared by the point in any case.

> Otherwise it seems like you are right and it's a dead code to be removed. I
> tried to check history to see when it was actually needed, but seems it predates
> git.

Yeah. But we keep updating it...

-- 
 Kirill A. Shutemov

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