powerpc: get rid of zeroing, switch to RAW_COPY_USER

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 4 insertions, 88 deletions

diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 2b5e09020cfe..ed7dfce331e0 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -14,7 +14,7 @@ obj-y += string.o alloc.o crtsavres.o code-patching.o \
 
 obj-$(CONFIG_PPC32)	+= div64.o copy_32.o
 
-obj64-y	+= copypage_64.o copyuser_64.o usercopy_64.o mem_64.o hweight_64.o \
+obj64-y	+= copypage_64.o copyuser_64.o mem_64.o hweight_64.o \
 	   copyuser_power7.o string_64.o copypage_power7.o memcpy_power7.o \
 	   memcpy_64.o memcmp_64.o
 
diff --git a/arch/powerpc/lib/copy_32.S b/arch/powerpc/lib/copy_32.S
index ff0d894d7ff9..8aedbb5f4b86 100644
--- a/arch/powerpc/lib/copy_32.S
+++ b/arch/powerpc/lib/copy_32.S
@@ -477,18 +477,6 @@ _GLOBAL(__copy_tofrom_user)
 	bdnz	130b
 /* then clear out the destination: r3 bytes starting at 4(r6) */
 132:	mfctr	r3
-	srwi.	r0,r3,2
-	li	r9,0
-	mtctr	r0
-	beq	113f
-112:	stwu	r9,4(r6)
-	bdnz	112b
-113:	andi.	r0,r3,3
-	mtctr	r0
-	beq	120f
-114:	stb	r9,4(r6)
-	addi	r6,r6,1
-	bdnz	114b
 120:	blr
 
 	EX_TABLE(30b,108b)
@@ -497,7 +485,5 @@ _GLOBAL(__copy_tofrom_user)
 	EX_TABLE(41b,111b)
 	EX_TABLE(130b,132b)
 	EX_TABLE(131b,120b)
-	EX_TABLE(112b,120b)
-	EX_TABLE(114b,120b)
 
 EXPORT_SYMBOL(__copy_tofrom_user)
diff --git a/arch/powerpc/lib/copyuser_64.S b/arch/powerpc/lib/copyuser_64.S
index aee6e24e81ab..08da06e1bd72 100644
--- a/arch/powerpc/lib/copyuser_64.S
+++ b/arch/powerpc/lib/copyuser_64.S
@@ -319,32 +319,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
 	blr
 
 /*
- * here we have trapped again, need to clear ctr bytes starting at r3
+ * here we have trapped again, amount remaining is in ctr.
  */
-143:	mfctr	r5
-	li	r0,0
-	mr	r4,r3
-	mr	r3,r5		/* return the number of bytes not copied */
-1:	andi.	r9,r4,7
-	beq	3f
-90:	stb	r0,0(r4)
-	addic.	r5,r5,-1
-	addi	r4,r4,1
-	bne	1b
-	blr
-3:	cmpldi	cr1,r5,8
-	srdi	r9,r5,3
-	andi.	r5,r5,7
-	blt	cr1,93f
-	mtctr	r9
-91:	std	r0,0(r4)
-	addi	r4,r4,8
-	bdnz	91b
-93:	beqlr
-	mtctr	r5	
-92:	stb	r0,0(r4)
-	addi	r4,r4,1
-	bdnz	92b
+143:	mfctr	r3
 	blr
 
 /*
@@ -389,10 +366,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
 	ld	r5,-8(r1)
 	add	r6,r6,r5
 	subf	r3,r3,r6	/* #bytes not copied */
-190:
-191:
-192:
-	blr			/* #bytes not copied in r3 */
+	blr
 
 	EX_TABLE(20b,120b)
 	EX_TABLE(220b,320b)
@@ -451,9 +425,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
 	EX_TABLE(88b,188b)
 	EX_TABLE(43b,143b)
 	EX_TABLE(89b,189b)
-	EX_TABLE(90b,190b)
-	EX_TABLE(91b,191b)
-	EX_TABLE(92b,192b)
 
 /*
  * Routine to copy a whole page of data, optimized for POWER4.
diff --git a/arch/powerpc/lib/usercopy_64.c b/arch/powerpc/lib/usercopy_64.c
deleted file mode 100644
index 9bd3a3dad78d..000000000000
--- a/arch/powerpc/lib/usercopy_64.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Functions which are too large to be inlined.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-#include <linux/module.h>
-#include <linux/uaccess.h>
-
-unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	if (likely(access_ok(VERIFY_READ, from, n)))
-		n = __copy_from_user(to, from, n);
-	else
-		memset(to, 0, n);
-	return n;
-}
-
-unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	if (likely(access_ok(VERIFY_WRITE, to, n)))
-		n = __copy_to_user(to, from, n);
-	return n;
-}
-
-unsigned long copy_in_user(void __user *to, const void __user *from,
-			   unsigned long n)
-{
-	might_sleep();
-	if (likely(access_ok(VERIFY_READ, from, n) &&
-	    access_ok(VERIFY_WRITE, to, n)))
-		n =__copy_tofrom_user(to, from, n);
-	return n;
-}
-
-EXPORT_SYMBOL(copy_from_user);
-EXPORT_SYMBOL(copy_to_user);
-EXPORT_SYMBOL(copy_in_user);
-