mtd: cfi: deinline large functions

With this .config: http://busybox.net/~vda/kernel_config,
after uninlining these functions have sizes and callsite counts
as follows:

cfi_udelay(): 74 bytes, 26 callsites
cfi_send_gen_cmd(): 153 bytes, 95 callsites
cfi_build_cmd(): 274 bytes, 123 callsites
cfi_build_cmd_addr(): 49 bytes, 15 callsites
cfi_merge_status(): 230 bytes, 3 callsites

Reduction in code size is about 50,000:

    text     data      bss       dec     hex filename
85842882 22294584 20627456 128764922 7accbfa vmlinux.before
85789648 22294616 20627456 128711720 7abfc28 vmlinux

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: Dan Carpenter <dan.carpenter@oracle.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Brian Norris <computersforpeace@gmail.com>
CC: Aaron Sierra <asierra@xes-inc.com>
CC: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
CC: David Woodhouse <David.Woodhouse@intel.com>
CC: linux-mtd@lists.infradead.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/chips/cfi_util.c

@@ -23,6 +23,194 @@
 #include <linux/mtd/map.h>
 #include <linux/mtd/cfi.h>
 
+void cfi_udelay(int us)
+{
+	if (us >= 1000) {
+		msleep((us+999)/1000);
+	} else {
+		udelay(us);
+		cond_resched();
+	}
+}
+EXPORT_SYMBOL(cfi_udelay);
+
+/*
+ * Returns the command address according to the given geometry.
+ */
+uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs,
+				struct map_info *map, struct cfi_private *cfi)
+{
+	unsigned bankwidth = map_bankwidth(map);
+	unsigned interleave = cfi_interleave(cfi);
+	unsigned type = cfi->device_type;
+	uint32_t addr;
+
+	addr = (cmd_ofs * type) * interleave;
+
+	/* Modify the unlock address if we are in compatibility mode.
+	 * For 16bit devices on 8 bit busses
+	 * and 32bit devices on 16 bit busses
+	 * set the low bit of the alternating bit sequence of the address.
+	 */
+	if (((type * interleave) > bankwidth) && ((cmd_ofs & 0xff) == 0xaa))
+		addr |= (type >> 1)*interleave;
+
+	return  addr;
+}
+EXPORT_SYMBOL(cfi_build_cmd_addr);
+
+/*
+ * Transforms the CFI command for the given geometry (bus width & interleave).
+ * It looks too long to be inline, but in the common case it should almost all
+ * get optimised away.
+ */
+map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi)
+{
+	map_word val = { {0} };
+	int wordwidth, words_per_bus, chip_mode, chips_per_word;
+	unsigned long onecmd;
+	int i;
+
+	/* We do it this way to give the compiler a fighting chance
+	   of optimising away all the crap for 'bankwidth' larger than
+	   an unsigned long, in the common case where that support is
+	   disabled */
+	if (map_bankwidth_is_large(map)) {
+		wordwidth = sizeof(unsigned long);
+		words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
+	} else {
+		wordwidth = map_bankwidth(map);
+		words_per_bus = 1;
+	}
+
+	chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
+	chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
+
+	/* First, determine what the bit-pattern should be for a single
+	   device, according to chip mode and endianness... */
+	switch (chip_mode) {
+	default: BUG();
+	case 1:
+		onecmd = cmd;
+		break;
+	case 2:
+		onecmd = cpu_to_cfi16(map, cmd);
+		break;
+	case 4:
+		onecmd = cpu_to_cfi32(map, cmd);
+		break;
+	}
+
+	/* Now replicate it across the size of an unsigned long, or
+	   just to the bus width as appropriate */
+	switch (chips_per_word) {
+	default: BUG();
+#if BITS_PER_LONG >= 64
+	case 8:
+		onecmd |= (onecmd << (chip_mode * 32));
+#endif
+	case 4:
+		onecmd |= (onecmd << (chip_mode * 16));
+	case 2:
+		onecmd |= (onecmd << (chip_mode * 8));
+	case 1:
+		;
+	}
+
+	/* And finally, for the multi-word case, replicate it
+	   in all words in the structure */
+	for (i=0; i < words_per_bus; i++) {
+		val.x[i] = onecmd;
+	}
+
+	return val;
+}
+EXPORT_SYMBOL(cfi_build_cmd);
+
+unsigned long cfi_merge_status(map_word val, struct map_info *map,
+					   struct cfi_private *cfi)
+{
+	int wordwidth, words_per_bus, chip_mode, chips_per_word;
+	unsigned long onestat, res = 0;
+	int i;
+
+	/* We do it this way to give the compiler a fighting chance
+	   of optimising away all the crap for 'bankwidth' larger than
+	   an unsigned long, in the common case where that support is
+	   disabled */
+	if (map_bankwidth_is_large(map)) {
+		wordwidth = sizeof(unsigned long);
+		words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
+	} else {
+		wordwidth = map_bankwidth(map);
+		words_per_bus = 1;
+	}
+
+	chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
+	chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
+
+	onestat = val.x[0];
+	/* Or all status words together */
+	for (i=1; i < words_per_bus; i++) {
+		onestat |= val.x[i];
+	}
+
+	res = onestat;
+	switch(chips_per_word) {
+	default: BUG();
+#if BITS_PER_LONG >= 64
+	case 8:
+		res |= (onestat >> (chip_mode * 32));
+#endif
+	case 4:
+		res |= (onestat >> (chip_mode * 16));
+	case 2:
+		res |= (onestat >> (chip_mode * 8));
+	case 1:
+		;
+	}
+
+	/* Last, determine what the bit-pattern should be for a single
+	   device, according to chip mode and endianness... */
+	switch (chip_mode) {
+	case 1:
+		break;
+	case 2:
+		res = cfi16_to_cpu(map, res);
+		break;
+	case 4:
+		res = cfi32_to_cpu(map, res);
+		break;
+	default: BUG();
+	}
+	return res;
+}
+EXPORT_SYMBOL(cfi_merge_status);
+
+/*
+ * Sends a CFI command to a bank of flash for the given geometry.
+ *
+ * Returns the offset in flash where the command was written.
+ * If prev_val is non-null, it will be set to the value at the command address,
+ * before the command was written.
+ */
+uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base,
+				struct map_info *map, struct cfi_private *cfi,
+				int type, map_word *prev_val)
+{
+	map_word val;
+	uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, map, cfi);
+	val = cfi_build_cmd(cmd, map, cfi);
+
+	if (prev_val)
+		*prev_val = map_read(map, addr);
+
+	map_write(map, val, addr);
+
+	return addr - base;
+}
+EXPORT_SYMBOL(cfi_send_gen_cmd);
+
 int __xipram cfi_qry_present(struct map_info *map, __u32 base,
 			     struct cfi_private *cfi)
 {

include/linux/mtd/cfi.h

@@ -296,183 +296,19 @@ struct cfi_private {
 	struct flchip chips[0];  /* per-chip data structure for each chip */
 };
 
-/*
- * Returns the command address according to the given geometry.
- */
-static inline uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs,
-				struct map_info *map, struct cfi_private *cfi)
-{
-	unsigned bankwidth = map_bankwidth(map);
-	unsigned interleave = cfi_interleave(cfi);
-	unsigned type = cfi->device_type;
-	uint32_t addr;
-	
-	addr = (cmd_ofs * type) * interleave;
-
-	/* Modify the unlock address if we are in compatibility mode.
-	 * For 16bit devices on 8 bit busses
-	 * and 32bit devices on 16 bit busses
-	 * set the low bit of the alternating bit sequence of the address.
-	 */
-	if (((type * interleave) > bankwidth) && ((cmd_ofs & 0xff) == 0xaa))
-		addr |= (type >> 1)*interleave;
-
-	return  addr;
-}
-
-/*
- * Transforms the CFI command for the given geometry (bus width & interleave).
- * It looks too long to be inline, but in the common case it should almost all
- * get optimised away.
- */
-static inline map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi)
-{
-	map_word val = { {0} };
-	int wordwidth, words_per_bus, chip_mode, chips_per_word;
-	unsigned long onecmd;
-	int i;
-
-	/* We do it this way to give the compiler a fighting chance
-	   of optimising away all the crap for 'bankwidth' larger than
-	   an unsigned long, in the common case where that support is
-	   disabled */
-	if (map_bankwidth_is_large(map)) {
-		wordwidth = sizeof(unsigned long);
-		words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
-	} else {
-		wordwidth = map_bankwidth(map);
-		words_per_bus = 1;
-	}
-
-	chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
-	chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
-
-	/* First, determine what the bit-pattern should be for a single
-	   device, according to chip mode and endianness... */
-	switch (chip_mode) {
-	default: BUG();
-	case 1:
-		onecmd = cmd;
-		break;
-	case 2:
-		onecmd = cpu_to_cfi16(map, cmd);
-		break;
-	case 4:
-		onecmd = cpu_to_cfi32(map, cmd);
-		break;
-	}
-
-	/* Now replicate it across the size of an unsigned long, or
-	   just to the bus width as appropriate */
-	switch (chips_per_word) {
-	default: BUG();
-#if BITS_PER_LONG >= 64
-	case 8:
-		onecmd |= (onecmd << (chip_mode * 32));
-#endif
-	case 4:
-		onecmd |= (onecmd << (chip_mode * 16));
-	case 2:
-		onecmd |= (onecmd << (chip_mode * 8));
-	case 1:
-		;
-	}
+uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs,
+				struct map_info *map, struct cfi_private *cfi);
 
-	/* And finally, for the multi-word case, replicate it
-	   in all words in the structure */
-	for (i=0; i < words_per_bus; i++) {
-		val.x[i] = onecmd;
-	}
-
-	return val;
-}
+map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi);
 #define CMD(x)  cfi_build_cmd((x), map, cfi)
 
-
-static inline unsigned long cfi_merge_status(map_word val, struct map_info *map,
-					   struct cfi_private *cfi)
-{
-	int wordwidth, words_per_bus, chip_mode, chips_per_word;
-	unsigned long onestat, res = 0;
-	int i;
-
-	/* We do it this way to give the compiler a fighting chance
-	   of optimising away all the crap for 'bankwidth' larger than
-	   an unsigned long, in the common case where that support is
-	   disabled */
-	if (map_bankwidth_is_large(map)) {
-		wordwidth = sizeof(unsigned long);
-		words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
-	} else {
-		wordwidth = map_bankwidth(map);
-		words_per_bus = 1;
-	}
-
-	chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
-	chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
-
-	onestat = val.x[0];
-	/* Or all status words together */
-	for (i=1; i < words_per_bus; i++) {
-		onestat |= val.x[i];
-	}
-
-	res = onestat;
-	switch(chips_per_word) {
-	default: BUG();
-#if BITS_PER_LONG >= 64
-	case 8:
-		res |= (onestat >> (chip_mode * 32));
-#endif
-	case 4:
-		res |= (onestat >> (chip_mode * 16));
-	case 2:
-		res |= (onestat >> (chip_mode * 8));
-	case 1:
-		;
-	}
-
-	/* Last, determine what the bit-pattern should be for a single
-	   device, according to chip mode and endianness... */
-	switch (chip_mode) {
-	case 1:
-		break;
-	case 2:
-		res = cfi16_to_cpu(map, res);
-		break;
-	case 4:
-		res = cfi32_to_cpu(map, res);
-		break;
-	default: BUG();
-	}
-	return res;
-}
-
+unsigned long cfi_merge_status(map_word val, struct map_info *map,
+					   struct cfi_private *cfi);
 #define MERGESTATUS(x) cfi_merge_status((x), map, cfi)
 
-
-/*
- * Sends a CFI command to a bank of flash for the given geometry.
- *
- * Returns the offset in flash where the command was written.
- * If prev_val is non-null, it will be set to the value at the command address,
- * before the command was written.
- */
-static inline uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base,
+uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base,
 				struct map_info *map, struct cfi_private *cfi,
-				int type, map_word *prev_val)
-{
-	map_word val;
-	uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, map, cfi);
-	val = cfi_build_cmd(cmd, map, cfi);
-
-	if (prev_val)
-		*prev_val = map_read(map, addr);
-
-	map_write(map, val, addr);
-
-	return addr - base;
-}
+				int type, map_word *prev_val);
 
 static inline uint8_t cfi_read_query(struct map_info *map, uint32_t addr)
 {
@@ -506,15 +342,7 @@ static inline uint16_t cfi_read_query16(struct map_info *map, uint32_t addr)
 	}
 }
 
-static inline void cfi_udelay(int us)
-{
-	if (us >= 1000) {
-		msleep((us+999)/1000);
-	} else {
-		udelay(us);
-		cond_resched();
-	}
-}
+void cfi_udelay(int us);
 
 int __xipram cfi_qry_present(struct map_info *map, __u32 base,
 			     struct cfi_private *cfi);