linux-kernel - Re: [RFC v5 PATCH 8/9] hugetlbfs: add hugetlbfs

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Date:	Fri, 24 Jul 2015 08:25:34 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	David Rientjes <rientjes@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC v5 PATCH 8/9] hugetlbfs: add hugetlbfs_fallocate()

I hope this is the current version of the pathc - I somehow got lost in
last submissions where the discussion happens in v4 thread. This version
seems to have the same issue:
---
>From 04c37a979c5ce8cd39d3243e4e2c12905e4f1e6e Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@...e.com>
Date: Fri, 24 Jul 2015 08:14:32 +0200
Subject: [PATCH] mmotm:
 hugetlbfs-new-huge_add_to_page_cache-helper-routine-fix
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

hugetlbfs_fallocate relies on CONFIG_NUMA and fails to compile otherwise.
This just makes the code compile but it seems it begs for a better solution.

fs/hugetlbfs/inode.c: In function ‘hugetlbfs_fallocate’:
fs/hugetlbfs/inode.c:578:13: error: ‘struct vm_area_struct’ has no member named ‘vm_policy’
   pseudo_vma.vm_policy =
             ^
fs/hugetlbfs/inode.c:579:4: error: implicit declaration of function ‘mpol_shared_policy_lookup’ [-Werror=implicit-function-declaration]
    mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy,
    ^
fs/hugetlbfs/inode.c:595:28: error: ‘struct vm_area_struct’ has no member named ‘vm_policy’
    mpol_cond_put(pseudo_vma.vm_policy);
                            ^
fs/hugetlbfs/inode.c:601:27: error: ‘struct vm_area_struct’ has no member named ‘vm_policy’
   mpol_cond_put(pseudo_vma.vm_policy);

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 fs/hugetlbfs/inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index d977cae89d29..dfca09218d77 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -575,9 +575,11 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 		}
 
 		/* Get policy based on index */
+#ifdef CONFIG_NUMA
 		pseudo_vma.vm_policy =
 			mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy,
 							index);
+#endif
 
 		/* addr is the offset within the file (zero based) */
 		addr = index * hpage_size;
@@ -592,13 +594,17 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 		if (page) {
 			put_page(page);
 			mutex_unlock(&hugetlb_fault_mutex_table[hash]);
+#ifdef CONFIG_NUMA
 			mpol_cond_put(pseudo_vma.vm_policy);
+#endif
 			continue;
 		}
 
 		/* Allocate page and add to page cache */
 		page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve);
+#ifdef CONFIG_NUMA
 		mpol_cond_put(pseudo_vma.vm_policy);
+#endif
 		if (IS_ERR(page)) {
 			mutex_unlock(&hugetlb_fault_mutex_table[hash]);
 			error = PTR_ERR(page);
-- 
2.1.4


-- 
Michal Hocko
SUSE Labs
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