linux-kernel - Re: [PATCHv2 1/2] mm/gup: fix omission of check on FOLL_LONGTERM in get_user_pages

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Message-ID: <20190603164206.GB29719@infradead.org>
Date:   Mon, 3 Jun 2019 09:42:06 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     linux-mm@...ck.org, Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Keith Busch <keith.busch@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/2] mm/gup: fix omission of check on FOLL_LONGTERM in
 get_user_pages_fast()

> +#if defined(CONFIG_CMA)

You can just use #ifdef here.

> +static inline int reject_cma_pages(int nr_pinned, unsigned int gup_flags,
> +	struct page **pages)

Please use two instead of one tab to indent the continuing line of
a function declaration.

> +{
> +	if (unlikely(gup_flags & FOLL_LONGTERM)) {

IMHO it would be a little nicer if we could move this into the caller.