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[142.162.113.180]) by smtp.gmail.com with ESMTPSA id q5sm10273119qte.38.2019.10.07.09.10.49 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 07 Oct 2019 09:10:49 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1iHVaz-0006jz-5t; Mon, 07 Oct 2019 13:10:49 -0300 Date: Mon, 7 Oct 2019 13:10:49 -0300 From: Jason Gunthorpe To: Steven Price Cc: linux-mm@kvack.org, Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Andrew Morton Subject: Re: [PATCH v11 14/22] mm: pagewalk: Add 'depth' parameter to pte_hole Message-ID: <20191007161049.GA13229@ziepe.ca> References: <20191007153822.16518-1-steven.price@arm.com> <20191007153822.16518-15-steven.price@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191007153822.16518-15-steven.price@arm.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 07, 2019 at 04:38:14PM +0100, Steven Price wrote: > diff --git a/mm/hmm.c b/mm/hmm.c > index 902f5fa6bf93..34fe904dd417 100644 > +++ b/mm/hmm.c > @@ -376,7 +376,7 @@ static void hmm_range_need_fault(const struct hmm_vma_walk *hmm_vma_walk, > } > > static int hmm_vma_walk_hole(unsigned long addr, unsigned long end, > - struct mm_walk *walk) > + __always_unused int depth, struct mm_walk *walk) It this __always_unused on function arguments something we are doing now? Can we have negative depth? Should it be unsigned? > { > struct hmm_vma_walk *hmm_vma_walk = walk->private; > struct hmm_range *range = hmm_vma_walk->range; > @@ -564,7 +564,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, > again: > pmd = READ_ONCE(*pmdp); > if (pmd_none(pmd)) > - return hmm_vma_walk_hole(start, end, walk); > + return hmm_vma_walk_hole(start, end, 0, walk); > > if (thp_migration_supported() && is_pmd_migration_entry(pmd)) { > bool fault, write_fault; > @@ -666,7 +666,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end, > again: > pud = READ_ONCE(*pudp); > if (pud_none(pud)) > - return hmm_vma_walk_hole(start, end, walk); > + return hmm_vma_walk_hole(start, end, 0, walk); > > if (pud_huge(pud) && pud_devmap(pud)) { > unsigned long i, npages, pfn; > @@ -674,7 +674,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end, > bool fault, write_fault; > > if (!pud_present(pud)) > - return hmm_vma_walk_hole(start, end, walk); > + return hmm_vma_walk_hole(start, end, 0, walk); > > i = (addr - range->start) >> PAGE_SHIFT; > npages = (end - addr) >> PAGE_SHIFT; Otherwise this mechanical change to hmm.c looks OK to me Jason