hugetlb: don't use ERR_PTR with VM_FAULT* values
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.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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 @@
*/
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 @@
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 @@
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 @@
/* 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 @@
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));