diff --git a/arch/powerpc/include/asm/asm-prototypes.h b/arch/powerpc/include/asm/asm-prototypes.h
index d0b832cbbec8..22c9d08fa3a4 100644
--- a/arch/powerpc/include/asm/asm-prototypes.h
+++ b/arch/powerpc/include/asm/asm-prototypes.h
@@ -82,8 +82,8 @@ void kernel_bad_stack(struct pt_regs *regs);
 void system_reset_exception(struct pt_regs *regs);
 void machine_check_exception(struct pt_regs *regs);
 void emulation_assist_interrupt(struct pt_regs *regs);
-long do_slb_fault(struct pt_regs *regs, unsigned long ea);
-void do_bad_slb_fault(struct pt_regs *regs, unsigned long ea, long err);
+long do_slb_fault(struct pt_regs *regs);
+void do_bad_slb_fault(struct pt_regs *regs);
 
 /* signals, syscalls and interrupts */
 long sys_swapcontext(struct ucontext __user *old_ctx,
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index bc8c91f2d26f..e843d0b193d3 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -453,7 +453,7 @@ static inline unsigned long hpt_hash(unsigned long vpn,
 #define HPTE_LOCAL_UPDATE	0x1
 #define HPTE_NOHPTE_UPDATE	0x2
 
-int do_hash_fault(struct pt_regs *regs, unsigned long ea, unsigned long dsisr);
+long do_hash_fault(struct pt_regs *regs);
 extern int __hash_page_4K(unsigned long ea, unsigned long access,
 			  unsigned long vsid, pte_t *ptep, unsigned long trap,
 			  unsigned long flags, int ssize, int subpage_prot);
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
index c0e9b7a967a8..897bad6b6bbb 100644
--- a/arch/powerpc/include/asm/bug.h
+++ b/arch/powerpc/include/asm/bug.h
@@ -111,8 +111,8 @@
 #ifndef __ASSEMBLY__
 
 struct pt_regs;
-extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
-int hash__do_page_fault(struct pt_regs *, unsigned long, unsigned long);
+long do_page_fault(struct pt_regs *);
+long hash__do_page_fault(struct pt_regs *);
 extern void bad_page_fault(struct pt_regs *, unsigned long, int);
 extern void _exception(int, struct pt_regs *, int, unsigned long);
 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index f579ce46eef2..25fa7d5a643c 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -1011,8 +1011,6 @@ storage_fault_common:
 	std	r14,_DAR(r1)
 	std	r15,_DSISR(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	mr	r4,r14
-	mr	r5,r15
 	ld	r14,PACA_EXGEN+EX_R14(r13)
 	ld	r15,PACA_EXGEN+EX_R15(r13)
 	bl	do_page_fault
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index f830b893fe03..1f34cfd1887c 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1437,8 +1437,6 @@ EXC_VIRT_BEGIN(data_access, 0x4300, 0x80)
 EXC_VIRT_END(data_access, 0x4300, 0x80)
 EXC_COMMON_BEGIN(data_access_common)
 	GEN_COMMON data_access
-	ld	r4,_DAR(r1)
-	ld	r5,_DSISR(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 BEGIN_MMU_FTR_SECTION
 	bl	do_hash_fault
@@ -1491,10 +1489,9 @@ EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
 EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
 EXC_COMMON_BEGIN(data_access_slb_common)
 	GEN_COMMON data_access_slb
-	ld	r4,_DAR(r1)
-	addi	r3,r1,STACK_FRAME_OVERHEAD
 BEGIN_MMU_FTR_SECTION
 	/* HPT case, do SLB fault */
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	do_slb_fault
 	cmpdi	r3,0
 	bne-	1f
@@ -1506,8 +1503,6 @@ MMU_FTR_SECTION_ELSE
 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
 	std	r3,RESULT(r1)
 	RECONCILE_IRQ_STATE(r10, r11)
-	ld	r4,_DAR(r1)
-	ld	r5,RESULT(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	do_bad_slb_fault
 	b	interrupt_return
@@ -1542,8 +1537,6 @@ EXC_VIRT_BEGIN(instruction_access, 0x4400, 0x80)
 EXC_VIRT_END(instruction_access, 0x4400, 0x80)
 EXC_COMMON_BEGIN(instruction_access_common)
 	GEN_COMMON instruction_access
-	ld	r4,_DAR(r1)
-	ld	r5,_DSISR(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 BEGIN_MMU_FTR_SECTION
 	bl	do_hash_fault
@@ -1587,10 +1580,9 @@ EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
 EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80)
 EXC_COMMON_BEGIN(instruction_access_slb_common)
 	GEN_COMMON instruction_access_slb
-	ld	r4,_DAR(r1)
-	addi	r3,r1,STACK_FRAME_OVERHEAD
 BEGIN_MMU_FTR_SECTION
 	/* HPT case, do SLB fault */
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	do_slb_fault
 	cmpdi	r3,0
 	bne-	1f
@@ -1602,8 +1594,6 @@ MMU_FTR_SECTION_ELSE
 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
 	std	r3,RESULT(r1)
 	RECONCILE_IRQ_STATE(r10, r11)
-	ld	r4,_DAR(r1)
-	ld	r5,RESULT(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	do_bad_slb_fault
 	b	interrupt_return
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 44c9018aed1b..ea31f75e9692 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -179,9 +179,9 @@ _ENTRY(saved_ksp_limit)
  */
 	START_EXCEPTION(0x0300,	DataStorage)
 	EXCEPTION_PROLOG
-	mfspr	r5, SPRN_ESR		/* Grab the ESR, save it, pass arg3 */
+	mfspr	r5, SPRN_ESR		/* Grab the ESR, save it */
 	stw	r5, _ESR(r11)
-	mfspr	r4, SPRN_DEAR		/* Grab the DEAR, save it, pass arg2 */
+	mfspr	r4, SPRN_DEAR		/* Grab the DEAR, save it */
 	stw	r4, _DEAR(r11)
 	EXC_XFER_LITE(0x300, handle_page_fault)
 
@@ -191,9 +191,9 @@ _ENTRY(saved_ksp_limit)
  */
 	START_EXCEPTION(0x0400, InstructionAccess)
 	EXCEPTION_PROLOG
-	mr	r4,r12			/* Pass SRR0 as arg2 */
-	stw	r4, _DEAR(r11)
-	li	r5,0			/* Pass zero as arg3 */
+	li	r5,0
+	stw	r5, _ESR(r11)		/* Zero ESR */
+	stw	r12, _DEAR(r11)		/* SRR0 as DEAR */
 	EXC_XFER_LITE(0x400, handle_page_fault)
 
 /* 0x0500 - External Interrupt Exception */
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 9f359d3fba74..0cd95b633e2b 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -356,14 +356,14 @@ DataStoreTLBMiss:
 	. = 0x1300
 InstructionTLBError:
 	EXCEPTION_PROLOG
-	mr	r4,r12
 	andis.	r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
 	andis.	r10,r9,SRR1_ISI_NOPT@h
 	beq+	.Litlbie
-	tlbie	r4
+	tlbie	r12
 	/* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
 .Litlbie:
-	stw	r4, _DAR(r11)
+	stw	r12, _DAR(r11)
+	stw	r5, _DSISR(r11)
 	EXC_XFER_LITE(0x400, handle_page_fault)
 
 /* This is the data TLB error on the MPC8xx.  This could be due to
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 5eb9eedac920..81c69769cec6 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -369,9 +369,9 @@ BEGIN_MMU_FTR_SECTION
 	bl	hash_page
 END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 #endif	/* CONFIG_VMAP_STACK */
-1:	mr	r4,r12
 	andis.	r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
-	stw	r4, _DAR(r11)
+	stw	r5, _DSISR(r11)
+	stw	r12, _DAR(r11)
 	EXC_XFER_LITE(0x400, handle_page_fault)
 
 /* External interrupt */
@@ -698,8 +698,6 @@ handle_page_fault_tramp_1:
 #ifdef CONFIG_VMAP_STACK
 	EXCEPTION_PROLOG_2 handle_dar_dsisr=1
 #endif
-	lwz	r4, _DAR(r11)
-	lwz	r5, _DSISR(r11)
 	/* fall through */
 handle_page_fault_tramp_2:
 	EXC_XFER_LITE(0x300, handle_page_fault)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 71c359d438b5..1da0c1d1b0a1 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -477,9 +477,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
 	NORMAL_EXCEPTION_PROLOG(INST_STORAGE);		      \
 	mfspr	r5,SPRN_ESR;		/* Grab the ESR and save it */	      \
 	stw	r5,_ESR(r11);						      \
-	mr      r4,r12;                 /* Pass SRR0 as arg2 */		      \
-	stw	r4, _DEAR(r11);						      \
-	li      r5,0;                   /* Pass zero as arg3 */		      \
+	stw	r12, _DEAR(r11);	/* Pass SRR0 as arg2 */		      \
 	EXC_XFER_LITE(0x0400, handle_page_fault)
 
 #define ALIGNMENT_EXCEPTION						      \
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index bfa1b1966218..0f0bd4af4b2d 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -1510,13 +1510,15 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap,
 }
 EXPORT_SYMBOL_GPL(hash_page);
 
-int do_hash_fault(struct pt_regs *regs, unsigned long ea, unsigned long dsisr)
+long do_hash_fault(struct pt_regs *regs)
 {
+	unsigned long ea = regs->dar;
+	unsigned long dsisr = regs->dsisr;
 	unsigned long access = _PAGE_PRESENT | _PAGE_READ;
 	unsigned long flags = 0;
 	struct mm_struct *mm;
 	unsigned int region_id;
-	int err;
+	long err;
 
 	if (unlikely(dsisr & (DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)))
 		goto _do_page_fault;
@@ -1580,7 +1582,7 @@ int do_hash_fault(struct pt_regs *regs, unsigned long ea, unsigned long dsisr)
 
 	} else if (err) {
 _do_page_fault:
-		err = hash__do_page_fault(regs, ea, dsisr);
+		err = hash__do_page_fault(regs);
 	}
 
 	return err;
diff --git a/arch/powerpc/mm/book3s64/slb.c b/arch/powerpc/mm/book3s64/slb.c
index c30fcbfa0e32..cc34d50874c1 100644
--- a/arch/powerpc/mm/book3s64/slb.c
+++ b/arch/powerpc/mm/book3s64/slb.c
@@ -837,8 +837,9 @@ static long slb_allocate_user(struct mm_struct *mm, unsigned long ea)
 	return slb_insert_entry(ea, context, flags, ssize, false);
 }
 
-long do_slb_fault(struct pt_regs *regs, unsigned long ea)
+long do_slb_fault(struct pt_regs *regs)
 {
+	unsigned long ea = regs->dar;
 	unsigned long id = get_region_id(ea);
 
 	/* IRQs are not reconciled here, so can't check irqs_disabled */
@@ -889,13 +890,15 @@ long do_slb_fault(struct pt_regs *regs, unsigned long ea)
 	}
 }
 
-void do_bad_slb_fault(struct pt_regs *regs, unsigned long ea, long err)
+void do_bad_slb_fault(struct pt_regs *regs)
 {
+	int err = regs->result;
+
 	if (err == -EFAULT) {
 		if (user_mode(regs))
-			_exception(SIGSEGV, regs, SEGV_BNDERR, ea);
+			_exception(SIGSEGV, regs, SEGV_BNDERR, regs->dar);
 		else
-			bad_page_fault(regs, ea, SIGSEGV);
+			bad_page_fault(regs, regs->dar, SIGSEGV);
 	} else if (err == -EINVAL) {
 		unrecoverable_exception(regs);
 	} else {
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index e65a49f246ef..390a296b16a3 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -549,11 +549,12 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
 }
 NOKPROBE_SYMBOL(__do_page_fault);
 
-int do_page_fault(struct pt_regs *regs, unsigned long address,
-		  unsigned long error_code)
+long do_page_fault(struct pt_regs *regs)
 {
 	enum ctx_state prev_state = exception_enter();
-	int err;
+	unsigned long address = regs->dar;
+	unsigned long error_code = regs->dsisr;
+	long err;
 
 	err = __do_page_fault(regs, address, error_code);
 
@@ -580,11 +581,12 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 NOKPROBE_SYMBOL(do_page_fault);
 
 #ifdef CONFIG_PPC_BOOK3S_64
-/* Same as do_page_fault but interrupt entry has already run in do_hash_fault */
-int hash__do_page_fault(struct pt_regs *regs, unsigned long address,
-		  unsigned long error_code)
+/* Same as do_page_fault but no interrupt entry */
+long hash__do_page_fault(struct pt_regs *regs)
 {
-	int err;
+	unsigned long address = regs->dar;
+	unsigned long error_code = regs->dsisr;
+	long err;
 
 	err = __do_page_fault(regs, address, error_code);
 	if (unlikely(err)) {
