[PATCH 1/2] mm: fixup_userfault returns VM_FAULT_RETRY if asked

From	Dominik Dingel <dingel@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[PATCH 1/2] mm: fixup_userfault returns VM_FAULT_RETRY if asked
Date	2015-11-19 01:00 +0100
Message-ID	<qwkNQ-1An-9@gated-at.bofh.it> (permalink)
References	<qwkNQ-1An-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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When calling fixup_userfault with FAULT_FLAG_ALLOW_RETRY, fixup_userfault
didn't care about VM_FAULT_RETRY and returned 0. If the VM_FAULT_RETRY flag is
set we will return the complete result of handle_mm_fault.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
---
 mm/gup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/gup.c b/mm/gup.c
index deafa2c..2af3b31 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -609,6 +609,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
 			return -EFAULT;
 		BUG();
 	}
+	if (ret & VM_FAULT_RETRY)
+		return ret;
 	if (tsk) {
 		if (ret & VM_FAULT_MAJOR)
 			tsk->maj_flt++;
-- 
2.3.9

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[PATCH 1/2] mm: fixup_userfault returns VM_FAULT_RETRY if asked Dominik Dingel <dingel@linux.vnet.ibm.com> - 2015-11-19 01:00 +0100
  Re: [PATCH 1/2] mm: fixup_userfault returns VM_FAULT_RETRY if asked "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-11-19 01:20 +0100

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