lkml.org 
[lkml]   [2012]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -V8 02/16] hugetlb: don't use ERR_PTR with VM_FAULT* values
Date
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

The current use of VM_FAULT_* codes with ERR_PTR requires us to ensure
VM_FAULT_* values will not exceed MAX_ERRNO value. Decouple the
VM_FAULT_* values from MAX_ERRNO.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
mm/hugetlb.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c868309..34a7e23 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1123,10 +1123,10 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
*/
chg = vma_needs_reservation(h, vma, addr);
if (chg < 0)
- return ERR_PTR(-VM_FAULT_OOM);
+ return ERR_PTR(-ENOMEM);
if (chg)
if (hugepage_subpool_get_pages(spool, chg))
- return ERR_PTR(-VM_FAULT_SIGBUS);
+ return ERR_PTR(-ENOSPC);

spin_lock(&hugetlb_lock);
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
@@ -1136,7 +1136,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
hugepage_subpool_put_pages(spool, chg);
- return ERR_PTR(-VM_FAULT_SIGBUS);
+ return ERR_PTR(-ENOSPC);
}
}

@@ -2496,6 +2496,7 @@ retry_avoidcopy:
new_page = alloc_huge_page(vma, address, outside_reserve);

if (IS_ERR(new_page)) {
+ long err = PTR_ERR(new_page);
page_cache_release(old_page);

/*
@@ -2524,7 +2525,10 @@ retry_avoidcopy:

/* Caller expects lock to be held */
spin_lock(&mm->page_table_lock);
- return -PTR_ERR(new_page);
+ if (err == -ENOMEM)
+ return VM_FAULT_OOM;
+ else
+ return VM_FAULT_SIGBUS;
}

/*
@@ -2642,7 +2646,11 @@ retry:
goto out;
page = alloc_huge_page(vma, address, 0);
if (IS_ERR(page)) {
- ret = -PTR_ERR(page);
+ ret = PTR_ERR(page);
+ if (ret == -ENOMEM)
+ ret = VM_FAULT_OOM;
+ else
+ ret = VM_FAULT_SIGBUS;
goto out;
}
clear_huge_page(page, address, pages_per_huge_page(h));
--
1.7.10


\
 
 \ /
  Last update: 2012-06-09 11:41    [W:0.362 / U:1.656 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site