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 1c8f422059 ("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>

arch/powerpc/include/asm/copro.h

@@ -10,13 +10,15 @@
 #ifndef _ASM_POWERPC_COPRO_H
 #define _ASM_POWERPC_COPRO_H
 
+#include <linux/mm_types.h>
+
 struct copro_slb
 {
 	u64 esid, vsid;
 };
 
 int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
-			  unsigned long dsisr, unsigned *flt);
+			  unsigned long dsisr, vm_fault_t *flt);
 
 int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb);
 

arch/powerpc/mm/copro_fault.c

@@ -34,7 +34,7 @@
  * to handle fortunately.
  */
 int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
-		unsigned long dsisr, unsigned *flt)
+		unsigned long dsisr, vm_fault_t *flt)
 {
 	struct vm_area_struct *vma;
 	unsigned long is_write;

arch/powerpc/mm/fault.c

@@ -156,7 +156,7 @@ static noinline int bad_access(struct pt_regs *regs, unsigned long address)
 }
 
 static int do_sigbus(struct pt_regs *regs, unsigned long address,
-		     unsigned int fault)
+		     vm_fault_t fault)
 {
 	siginfo_t info;
 	unsigned int lsb = 0;
@@ -187,7 +187,8 @@ static int do_sigbus(struct pt_regs *regs, unsigned long address,
 	return 0;
 }
 
-static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault)
+static int mm_fault_error(struct pt_regs *regs, unsigned long addr,
+				vm_fault_t fault)
 {
 	/*
 	 * Kernel page fault interrupted by SIGKILL. We have no reason to
@@ -415,7 +416,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
  	int is_exec = TRAP(regs) == 0x400;
 	int is_user = user_mode(regs);
 	int is_write = page_fault_is_write(error_code);
-	int fault, major = 0;
+	vm_fault_t fault, major = 0;
 	bool must_retry = false;
 
 	if (notify_page_fault(regs))

arch/powerpc/platforms/cell/spufs/fault.c

@@ -111,7 +111,7 @@ int spufs_handle_class1(struct spu_context *ctx)
 {
 	u64 ea, dsisr, access;
 	unsigned long flags;
-	unsigned flt = 0;
+	vm_fault_t flt = 0;
 	int ret;
 
 	/*