[PATCH] asm-generic/io.h: terser readsb() and friends

[Alexey Dobriyan <adobriyan@xxxxxxxxx>]

	if (count) {
		do {
			...
		} while (--count);
	}

can be rewritten as

	while (count-- > 0) {
		...
	}

Drop useless variables while I'm at it.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 include/asm-generic/io.h |   68 ++++++++++++++++-------------------------------
 1 file changed, 24 insertions(+), 44 deletions(-)

--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -317,13 +317,10 @@ static inline void writeq_relaxed(u64 value, volatile void __iomem *addr)
 static inline void readsb(const volatile void __iomem *addr, void *buffer,
 			  unsigned int count)
 {
-	if (count) {
-		u8 *buf = buffer;
+	u8 *buf = buffer;
 
-		do {
-			u8 x = __raw_readb(addr);
-			*buf++ = x;
-		} while (--count);
+	while (count-- > 0) {
+		*buf++ = __raw_readb(addr);
 	}
 }
 #endif
@@ -333,13 +330,10 @@ static inline void readsb(const volatile void __iomem *addr, void *buffer,
 static inline void readsw(const volatile void __iomem *addr, void *buffer,
 			  unsigned int count)
 {
-	if (count) {
-		u16 *buf = buffer;
+	u16 *buf = buffer;
 
-		do {
-			u16 x = __raw_readw(addr);
-			*buf++ = x;
-		} while (--count);
+	while (count-- > 0) {
+		*buf++ = __raw_readw(addr);
 	}
 }
 #endif
@@ -349,13 +343,10 @@ static inline void readsw(const volatile void __iomem *addr, void *buffer,
 static inline void readsl(const volatile void __iomem *addr, void *buffer,
 			  unsigned int count)
 {
-	if (count) {
-		u32 *buf = buffer;
+	u32 *buf = buffer;
 
-		do {
-			u32 x = __raw_readl(addr);
-			*buf++ = x;
-		} while (--count);
+	while (count-- > 0) {
+		*buf++ = __raw_readl(addr);
 	}
 }
 #endif
@@ -366,13 +357,10 @@ static inline void readsl(const volatile void __iomem *addr, void *buffer,
 static inline void readsq(const volatile void __iomem *addr, void *buffer,
 			  unsigned int count)
 {
-	if (count) {
-		u64 *buf = buffer;
+	u64 *buf = buffer;
 
-		do {
-			u64 x = __raw_readq(addr);
-			*buf++ = x;
-		} while (--count);
+	while (count-- > 0) {
+		*buf++ = __raw_readq(addr);
 	}
 }
 #endif
@@ -383,12 +371,10 @@ static inline void readsq(const volatile void __iomem *addr, void *buffer,
 static inline void writesb(volatile void __iomem *addr, const void *buffer,
 			   unsigned int count)
 {
-	if (count) {
-		const u8 *buf = buffer;
+	const u8 *buf = buffer;
 
-		do {
-			__raw_writeb(*buf++, addr);
-		} while (--count);
+	while (count-- > 0) {
+		__raw_writeb(*buf++, addr);
 	}
 }
 #endif
@@ -398,12 +384,10 @@ static inline void writesb(volatile void __iomem *addr, const void *buffer,
 static inline void writesw(volatile void __iomem *addr, const void *buffer,
 			   unsigned int count)
 {
-	if (count) {
-		const u16 *buf = buffer;
+	const u16 *buf = buffer;
 
-		do {
-			__raw_writew(*buf++, addr);
-		} while (--count);
+	while (count-- > 0) {
+		__raw_writew(*buf++, addr);
 	}
 }
 #endif
@@ -413,12 +397,10 @@ static inline void writesw(volatile void __iomem *addr, const void *buffer,
 static inline void writesl(volatile void __iomem *addr, const void *buffer,
 			   unsigned int count)
 {
-	if (count) {
-		const u32 *buf = buffer;
+	const u32 *buf = buffer;
 
-		do {
-			__raw_writel(*buf++, addr);
-		} while (--count);
+	while (count-- > 0) {
+		__raw_writel(*buf++, addr);
 	}
 }
 #endif
@@ -429,12 +411,10 @@ static inline void writesl(volatile void __iomem *addr, const void *buffer,
 static inline void writesq(volatile void __iomem *addr, const void *buffer,
 			   unsigned int count)
 {
-	if (count) {
-		const u64 *buf = buffer;
+	const u64 *buf = buffer;
 
-		do {
-			__raw_writeq(*buf++, addr);
-		} while (--count);
+	while (count-- > 0) {
+		__raw_writeq(*buf++, addr);
 	}
 }
 #endif