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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id g21si26916997plo.235.2019.07.29.22.52.48 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 29 Jul 2019 22:52:48 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+c7577188abbe010e1e13+5819+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=qUVDb0Gb; spf=pass (google.com: best guess record for domain of batv+c7577188abbe010e1e13+5819+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+c7577188abbe010e1e13+5819+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=/5sNjyutpvGxyHVQu1GnV/XZDve/kWrhGHnNmckcmW4=; b=qUVDb0Gb7qkDZ66Y+5kTNUPiZS oPKFdf1FdqOh8A+YmmGZN9LNdSXHfAWdAy/P90p3MOCc2Z96eNVGgpwDoqMg90kChee4ehDTqgr0j Pkj3WfEI90d1K0L5yj8xDhi4zgmFwII7fKqNTkcOh87hmP8aIWYto5bpxj6Uy1e0sMmXDfuZHNiQe ryhsB5F5qd969AsJYWXGSU3b3LjXZyE7SQi6J6IID+hg37hn/a03/WzGB57Vb+NcFVUtwUa5rdmZi cmRAd6TOTOi1MrSWzl3EdA3D5NUMB0guYKclteB1z/GzP1uvBIhvL0Mxg647o4EVb80KI84ij7PDP xbU47HuQ==; Received: from [195.167.85.94] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hsL40-0001NU-9X; Tue, 30 Jul 2019 05:52:44 +0000 From: Christoph Hellwig To: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jason Gunthorpe , Ben Skeggs , Felix Kuehling Cc: Ralph Campbell , linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 10/13] mm: only define hmm_vma_walk_pud if needed Date: Tue, 30 Jul 2019 08:52:00 +0300 Message-Id: <20190730055203.28467-11-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190730055203.28467-1-hch@lst.de> References: <20190730055203.28467-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html 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: We only need the special pud_entry walker if PUD-sized hugepages and pte mappings are supported, else the common pagewalk code will take care of the iteration. Not implementing this callback reduced the amount of code compiled for non-x86 platforms, and also fixes compile failures with other architectures when helpers like pud_pfn are not implemented. Signed-off-by: Christoph Hellwig --- mm/hmm.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/mm/hmm.c b/mm/hmm.c index e63ab7f11334..4d3bd41b6522 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -455,15 +455,6 @@ static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd) range->flags[HMM_PFN_VALID]; } -static inline uint64_t pud_to_hmm_pfn_flags(struct hmm_range *range, pud_t pud) -{ - if (!pud_present(pud)) - return 0; - return pud_write(pud) ? range->flags[HMM_PFN_VALID] | - range->flags[HMM_PFN_WRITE] : - range->flags[HMM_PFN_VALID]; -} - static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr, unsigned long end, @@ -700,10 +691,19 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, return 0; } -static int hmm_vma_walk_pud(pud_t *pudp, - unsigned long start, - unsigned long end, - struct mm_walk *walk) +#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \ + defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) +static inline uint64_t pud_to_hmm_pfn_flags(struct hmm_range *range, pud_t pud) +{ + if (!pud_present(pud)) + return 0; + return pud_write(pud) ? range->flags[HMM_PFN_VALID] | + range->flags[HMM_PFN_WRITE] : + range->flags[HMM_PFN_VALID]; +} + +static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end, + struct mm_walk *walk) { struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; @@ -765,6 +765,9 @@ static int hmm_vma_walk_pud(pud_t *pudp, return 0; } +#else +#define hmm_vma_walk_pud NULL +#endif static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, unsigned long start, unsigned long end, -- 2.20.1