Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753426Ab2FIJA1 (ORCPT ); Sat, 9 Jun 2012 05:00:27 -0400 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:60635 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752463Ab2FIJAX (ORCPT ); Sat, 9 Jun 2012 05:00:23 -0400 From: "Aneesh Kumar K.V" To: linux-mm@kvack.org, kamezawa.hiroyu@jp.fujitsu.com, dhillf@gmail.com, rientjes@google.com, mhocko@suse.cz, akpm@linux-foundation.org, hannes@cmpxchg.org Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, "Aneesh Kumar K.V" Subject: [PATCH -V8 02/16] hugetlb: don't use ERR_PTR with VM_FAULT* values Date: Sat, 9 Jun 2012 14:29:47 +0530 Message-Id: <1339232401-14392-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10 In-Reply-To: <1339232401-14392-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1339232401-14392-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> x-cbid: 12060909-8256-0000-0000-000002DBADE0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2298 Lines: 79 From: "Aneesh Kumar K.V" 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 Signed-off-by: Aneesh Kumar K.V --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/