powerpc/pmac: Use string library in nvram code

- Use memchr_inv to check if the data contains all 0xFF bytes.
  It is faster than looping for each byte.

- Use memcmp to compare memory areas
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/powermac/nvram.c

@@ -279,7 +279,7 @@ static u32 core99_check(u8* datas)
 
 static int sm_erase_bank(int bank)
 {
-	int stat, i;
+	int stat;
 	unsigned long timeout;
 
 	u8 __iomem *base = (u8 __iomem *)nvram_data + core99_bank*NVRAM_SIZE;
@@ -301,8 +301,7 @@ static int sm_erase_bank(int bank)
 	out_8(base, SM_FLASH_CMD_CLEAR_STATUS);
 	out_8(base, SM_FLASH_CMD_RESET);
 
-	for (i=0; i<NVRAM_SIZE; i++)
-		if (base[i] != 0xff) {
+	if (memchr_inv(base, 0xff, NVRAM_SIZE)) {
 		printk(KERN_ERR "nvram: Sharp/Micron flash erase failed !\n");
 		return -ENXIO;
 	}
@@ -336,8 +335,7 @@ static int sm_write_bank(int bank, u8* datas)
 	}
 	out_8(base, SM_FLASH_CMD_CLEAR_STATUS);
 	out_8(base, SM_FLASH_CMD_RESET);
-	for (i=0; i<NVRAM_SIZE; i++)
-		if (base[i] != datas[i]) {
+	if (memcmp(base, datas, NVRAM_SIZE)) {
 		printk(KERN_ERR "nvram: Sharp/Micron flash write failed !\n");
 		return -ENXIO;
 	}
@@ -346,7 +344,7 @@ static int sm_write_bank(int bank, u8* datas)
 
 static int amd_erase_bank(int bank)
 {
-	int i, stat = 0;
+	int stat = 0;
 	unsigned long timeout;
 
 	u8 __iomem *base = (u8 __iomem *)nvram_data + core99_bank*NVRAM_SIZE;
@@ -383,8 +381,7 @@ static int amd_erase_bank(int bank)
 	out_8(base, 0xf0);
 	udelay(1);
 
-	for (i=0; i<NVRAM_SIZE; i++)
-		if (base[i] != 0xff) {
+	if (memchr_inv(base, 0xff, NVRAM_SIZE)) {
 		printk(KERN_ERR "nvram: AMD flash erase failed !\n");
 		return -ENXIO;
 	}
@@ -429,8 +426,7 @@ static int amd_write_bank(int bank, u8* datas)
 	out_8(base, 0xf0);
 	udelay(1);
 
-	for (i=0; i<NVRAM_SIZE; i++)
-		if (base[i] != datas[i]) {
+	if (memcmp(base, datas, NVRAM_SIZE)) {
 		printk(KERN_ERR "nvram: AMD flash write failed !\n");
 		return -ENXIO;
 	}