mm: convert return type of handle_mm_fault() caller to vm_fault_t

Use new return type vm_fault_t for fault handler.  For now, this is just
documenting that the function returns a VM_FAULT value rather than an
errno.  Once all instances are converted, vm_fault_t will become a
distinct type.

Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t")

In this patch all the caller of handle_mm_fault() are changed to return
vm_fault_t type.

Link: http://lkml.kernel.org/r/20180617084810.GA6730@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: David S. Miller <davem@davemloft.net>
Cc: Richard Weinberger <richard@nod.at>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 7 insertions, 4 deletions

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 1d0b53a04a08..58da65df03f5 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -508,7 +508,7 @@ static void do_fault(struct work_struct *work)
 {
 	struct fault *fault = container_of(work, struct fault, work);
 	struct vm_area_struct *vma;
-	int ret = VM_FAULT_ERROR;
+	vm_fault_t ret = VM_FAULT_ERROR;
 	unsigned int flags = 0;
 	struct mm_struct *mm;
 	u64 address;
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 45f6e581cd56..7d65aab36a96 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -24,6 +24,7 @@
 #include <linux/pci-ats.h>
 #include <linux/dmar.h>
 #include <linux/interrupt.h>
+#include <linux/mm_types.h>
 #include <asm/page.h>
 
 #define PASID_ENTRY_P		BIT_ULL(0)
@@ -594,7 +595,8 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 		struct vm_area_struct *vma;
 		struct page_req_dsc *req;
 		struct qi_desc resp;
-		int ret, result;
+		int result;
+		vm_fault_t ret;
 		u64 address;
 
 		handled = 1;
diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index 70dbb6de102c..93ecc67a0f3b 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -134,7 +134,7 @@ static int cxl_handle_segment_miss(struct cxl_context *ctx,
 
 int cxl_handle_mm_fault(struct mm_struct *mm, u64 dsisr, u64 dar)
 {
-	unsigned flt = 0;
+	vm_fault_t flt = 0;
 	int result;
 	unsigned long access, flags, inv_flags = 0;
 
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index 88876ae8f330..ffc731b0731a 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -2,6 +2,7 @@
 // Copyright 2017 IBM Corp.
 #include <linux/sched/mm.h>
 #include <linux/mutex.h>
+#include <linux/mm_types.h>
 #include <linux/mmu_context.h>
 #include <asm/copro.h>
 #include <asm/pnv-ocxl.h>
@@ -126,7 +127,7 @@ static void ack_irq(struct spa *spa, enum xsl_response r)
 
 static void xsl_fault_handler_bh(struct work_struct *fault_work)
 {
-	unsigned int flt = 0;
+	vm_fault_t flt = 0;
 	unsigned long access, flags, inv_flags = 0;
 	enum xsl_response r;
 	struct xsl_fault *fault = container_of(fault_work, struct xsl_fault,