linux-kernel - Re: [PATCH v2 3/4] mm: Introduce page_needs_cow_for

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Message-ID: <20210205005032.GV6468@xz-x1>
Date:   Thu, 4 Feb 2021 19:50:32 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Kirill Shutemov <kirill@...temov.name>,
        Wei Zhang <wzam@...zon.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Matthew Wilcox <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Gal Pressman <galpress@...zon.com>, Jan Kara <jack@...e.cz>,
        Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 3/4] mm: Introduce page_needs_cow_for_dma() for
 deciding whether cow

On Thu, Feb 04, 2021 at 07:20:00PM -0400, Jason Gunthorpe wrote:
> > +static inline bool is_cow_mapping(vm_flags_t flags)
> > +{
> 
> It feels a bit more logical to pass in a struct vm_area_struct *' here?

Agree, but only if I'm adding this as a new function.  Though it's a code
movement from internal.h to mm.h, so I avoided touching all the users of this
function that existed.

Thanks,

-- 
Peter Xu