linux-kernel - Re: [HMM 10/16] mm/hmm/mirror: helper to snapshot CPU page table v2

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Date:   Mon, 10 Apr 2017 10:35:05 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 10/16] mm/hmm/mirror: helper to snapshot CPU page table v2

On Wed 05-04-17 16:40:20, Jérôme Glisse wrote:
> This does not use existing page table walker because we want to share
> same code for our page fault handler.

I am getting the following compilation error with sparc32
allmodconfig. I didn't check more closely yet.

mm/hmm.c: In function 'hmm_vma_walk_pmd':
mm/hmm.c:370:53: error: macro "pte_index" requires 2 arguments, but only 1 given
    unsigned long pfn = pmd_pfn(pmd) + pte_index(addr);
                                                     ^
mm/hmm.c:370:39: error: 'pte_index' undeclared (first use in this function)
    unsigned long pfn = pmd_pfn(pmd) + pte_index(addr);
                                       ^
mm/hmm.c:370:39: note: each undeclared identifier is reported only once for each function it appears in
mm/hmm.c: In function 'hmm_devmem_release':
mm/hmm.c:816:2: error: implicit declaration of function 'arch_remove_memory' [-Werror=implicit-function-declaration]
  arch_remove_memory(align_start, align_size, devmem->pagemap.type);
  ^
cc1: some warnings being treated as errors
-- 
Michal Hocko
SUSE Labs