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authorAndy Whitcroft <apw@shadowen.org>2008-08-12 15:08:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-12 16:07:28 -0700
commit2b26736c88db85c038e04c2306d0745553e69602 (patch)
tree3914f58d18e93e33eee1256027551954ff24a432
parent57303d80175e10056bf51206f9961d586f02f967 (diff)
downloadop-kernel-dev-2b26736c88db85c038e04c2306d0745553e69602.zip
op-kernel-dev-2b26736c88db85c038e04c2306d0745553e69602.tar.gz
allocate structures for reservation tracking in hugetlbfs outside of spinlocks v2
[Andrew this should replace the previous version which did not check the returns from the region prepare for errors. This has been tested by us and Gerald and it looks good. Bah, while reviewing the locking based on your previous email I spotted that we need to check the return from the vma_needs_reservation call for allocation errors. Here is an updated patch to correct this. This passes testing here.] Signed-off-by: Andy Whitcroft <apw@shadowen.org> Tested-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/hugetlb.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4c97c17..67a7119 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1949,7 +1949,10 @@ retry:
* the spinlock.
*/
if (write_access && !(vma->vm_flags & VM_SHARED))
- vma_needs_reservation(h, vma, address);
+ if (vma_needs_reservation(h, vma, address) < 0) {
+ ret = VM_FAULT_OOM;
+ goto backout_unlocked;
+ }
spin_lock(&mm->page_table_lock);
size = i_size_read(mapping->host) >> huge_page_shift(h);
@@ -1976,6 +1979,7 @@ out:
backout:
spin_unlock(&mm->page_table_lock);
+backout_unlocked:
unlock_page(page);
put_page(page);
goto out;
@@ -2004,8 +2008,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
entry = huge_ptep_get(ptep);
if (huge_pte_none(entry)) {
ret = hugetlb_no_page(mm, vma, address, ptep, write_access);
- mutex_unlock(&hugetlb_instantiation_mutex);
- return ret;
+ goto out_unlock;
}
ret = 0;
@@ -2019,7 +2022,10 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* consumed.
*/
if (write_access && !pte_write(entry)) {
- vma_needs_reservation(h, vma, address);
+ if (vma_needs_reservation(h, vma, address) < 0) {
+ ret = VM_FAULT_OOM;
+ goto out_unlock;
+ }
if (!(vma->vm_flags & VM_SHARED))
pagecache_page = hugetlbfs_pagecache_page(h,
@@ -2039,6 +2045,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
put_page(pagecache_page);
}
+out_unlock:
mutex_unlock(&hugetlb_instantiation_mutex);
return ret;
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