[PATCH 16/20 v2] tile/mm/fault.c: Port OOM changes to handle_page_fault

[Kautuk Consul <consul.kautuk@gmail.com>]

Commit d065bd810b6deb67d4897a14bfe21f8eb526ba99
(mm: retry page fault when blocking on disk transfer) and
commit 37b23e0525d393d48a7d59f870b3bc061a30ccdb
(x86,mm: make pagefault killable)

The above commits introduced changes into the x86 pagefault handler
for making the page fault handler retryable as well as killable.

These changes reduce the mmap_sem hold time, which is crucial
during OOM killer invocation.

Port these changes to tile.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
---
 arch/tile/mm/fault.c |   31 ++++++++++++++++++++++++++-----
 1 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index c1eaaa1..a097631 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -267,6 +267,8 @@ static int handle_page_fault(struct pt_regs *regs,
 	int si_code;
 	int is_kernel_mode;
 	pgd_t *pgd;
+	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
+						 (write ? FAULT_FLAG_WRITE : 0);
 
 	/* on TILE, protection faults are always writes */
 	if (!is_page_fault)
@@ -373,6 +375,8 @@ static int handle_page_fault(struct pt_regs *regs,
 			vma = NULL;  /* happy compiler */
 			goto bad_area_nosemaphore;
 		}
+
+retry:
 		down_read(&mm->mmap_sem);
 	}
 
@@ -420,7 +424,11 @@ good_area:
 	 * make sure we exit gracefully rather than endlessly redo
 	 * the fault.
 	 */
-	fault = handle_mm_fault(mm, vma, address, write);
+	fault = handle_mm_fault(mm, vma, address, flags);
+
+	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
+		return 0;
+
 	if (unlikely(fault & VM_FAULT_ERROR)) {
 		if (fault & VM_FAULT_OOM)
 			goto out_of_memory;
@@ -428,10 +436,23 @@ good_area:
 			goto do_sigbus;
 		BUG();
 	}
-	if (fault & VM_FAULT_MAJOR)
-		tsk->maj_flt++;
-	else
-		tsk->min_flt++;
+	if (flags & FAULT_FLAG_ALLOW_RETRY) {
+		if (fault & VM_FAULT_MAJOR)
+			tsk->maj_flt++;
+		else
+			tsk->min_flt++;
+		if (fault & VM_FAULT_RETRY) {
+			flags &= ~FAULT_FLAG_ALLOW_RETRY;
+
+			/*
+			 * No need to up_read(&mm->mmap_sem) as we would
+			 * have already released it in __lock_page_or_retry
+			 * in mm/filemap.c.
+			 */
+
+			goto retry;
+		}
+	}
 
 #if CHIP_HAS_TILE_DMA() || CHIP_HAS_SN_PROC()
 	/*
-- 
1.7.5.4